Part Two - Configuring the GRE tunnel on the Cisco router Step 1 - Enter configuration mode. Step 1: configure. Now, we will configure the GRE tunnel interface. The VPN tunnel interface is configured as OER external interfaces on the master controller. Step 02: Use following commands to create a tunnel interface, configure an IPv4 Address for the new tunnel interface and to configure a source and destination for the tunnel interface in OmniSecuR2. Before You Begin Conventions For more information on document conventions, see the Cisco Technical Tips Conventions. This document contains descriptions, configurations and verifications for Generic Routing Encapsulation (GRE) in a cable environment. Note:The uBR900 cable modems do not have to be connected to the same uBR7200 CMTS or the same service provider's network as long as there is IP connectivity between the two cable modems. Just open the console of nay router and ping another end router. Now, we will initiate a ping for the Router R1 and verify our configuration. R1(config-if)#exit Example: Device (config)#interface tunnel 0. Verification: To verify, run a ping from the PC attached to the LAN on the Cisco router to the PC on the LAN attached to the Mikrotik router. Now, we have finished the configuration between both the GRE Neighbors. Before we begin with the tunnel configuration, we need to make sure no ACL is blocking GRE protocol (47) from the Incapsula Public IP to the Customer Public IP. On the Miktotik, you can click on the GRE interface and click on traffic to see the traffics passing through in real-time. GRE Encapsulation Structure This should be true regardless of whether you can ping the destination address. In this case, it would be the loop-back address of the far router. Because most transport MTUs are 1500 bytes and we have an added overhead because of GRE, we must reduce the MTU to account for the extra overhead. R2(config-if)#exit So lets configure the Network Interfaces on Router R1. So, open the routers global configuration mode and run the following commands in global configuration mode. Configuring Generic Routing Encapsulation(GRE) Tunnel IP Source and Destination VRF Membership . The first step is to configure your firewall device with the appropriate tunnel interfaces. Step 03: Use the following commands to configure OSPF for inter-site routing in OmniSecuR1. And its very interesting topic. Enters global configuration mode. To configure the tunnel source and destination, issue thetunnel source {ip-address | interface-type}andtunnel destination {host-name | ip-address}commands under the interface configuration mode for the tunnel. Prerequisites There are no specific prerequisites for this document. Steps should be taken to prevent the advertisement of the routes by a routing protocol across the network. The configuration of the CMTS is shown below. Example . All Rights Reserved. Your email address will not be published. GRE encapsulation structure is shown below Mirroring traffic to a GRE tunnel (also known as Encapsulated Remote Switched Port Analyzer [ER-SPAN] in Cisco IOS Software). R1(config-if)#ip mtu 1400 Enter into the configuration mode for RA Tunnel 0. b. Shown above are 2 Sites Site A and Site B. R1#configure terminal R2(config-router)#network 2.2.2.1 0.0 0.0 area 0 if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[580,400],'omnisecu_com-medrectangle-3','ezslot_4',125,'0','0'])};__ez_fad_position('div-gpt-ad-omnisecu_com-medrectangle-3-0');Refer previous lesson What is GRE (Generic Routing Encapsulation), to get more concepts about GRE (Generic Routing Encapsulation). Refer What is GRE (Generic Routing Encapsulation) for more details. A Cable Modem Termination System (CMTS) is any Data-over-Cable Service Interface Specifications (DOCSIS)-compliant headend cable router, such as the Cisco uBR7246, uBR7223, or uBR7246VXR. Define local GRE tunnel interface and assign it an IP address by typing the following commands: SFN_Router(config)# interface tunnel 0 SFN_Router(config-if)# ip address 196.100.101.1 255.255.255. R1(config)#interface tunnel 0 Follow these steps to configure GRE Tunnel IP Source and Destination VRF Membership: SUMMARY STEPS. GRE is initially defined in rfc1701. GNS3Network.com is not associated with any profit or non profit organization. The first route is the default route pointing to the ISP and another one is the route for the GRE Peer end LAN subnet. This document uses the configurations shown below. For the official GNS3 website, visit gns3.com. GRE encapsulation structure is shown below , I am here to share my knowledge and experience in the field of networking with the goal being - "The more you share, the more you learn." R2(config-if)#tunnel destination 200.200.200.1 jQuery(document).ready(function($) { The GRE tunnel behave as virtual point-to-point link that have two endpoints identified by the tunnel source and tunnel destination address. If you are facing any issue during GRE Tunnel configuration, please leave a comment in comment box! Now that configuration isdone on Both Router R1 and R2 of sitesA and B respectively , GRE tunnel is configured and both side LAN users can communicate to each other. Figure 1 shows an OER-managed network that is configured to optimize VPN traffic. Copyright 2008 - 2022 OmniSecu.com. }); Step 01: Use following commands to create a tunnel interface, configure an IPv4 Address for the new tunnel interface and to configure a source and destination for the tunnel interface in R1. This section provides information you can use to confirm your configuration is working properly. Learn more about how Cisco is using Inclusive Language. R2(config)#router ospf 1 After that, we we will define the Tunnel Source, with IP Address or with Interface name. To verify that PC1 can access PC2 and vice versa, perform extended pings on the cable modems, and also pings from the PCs . There is currently no specific troubleshooting information available for this configuration. However, it can also be configured over IPSec VPN to perform encryption. GRE (Generic Routing Encapsulation)allows Routing of IP packets between private IPv4 networks which are separated over public IPv4 internet. R2(config)#exit Routing Configuration Guide, Cisco IOS XE Fuji 16.9.x (Catalyst 9200 Switches) Configuring Generic Routing Encapsulation(GRE) Tunnel IP Source and Destination VRF Membership . GRE Tunnel Configuration - Lab Topology Step 01: Use following commands to create a tunnel interface, configure an IPv4 Address for the new tunnel interface and to configure a source and destination for the tunnel interface in OmniSecuR1. By default, GRE does not perform any kind of encryption. I am a biotechnologist by qualification and a Network Enthusiast by interest. All trademarks are the property of their respective owners. Router R1 has Public IP 101.1.1.1 and Router R2 has Public IP 102.1.1.1. GRE Tunnels: A Step By Step Configuration Guide - YouTube Want to configure a GRE Tunnel with ease? R2(config-if)#ip tcp adjust-mss 1360 Enter configuration commands, one per line. This website is for Educational Purposes Only and not provide any copyrighted material. Tunneling provides a way to encapsulate packets of a foreign protocol inside a transport protocol. Configure Branch vEdges to route all unknown traffic to route using Zscaler Cloud router, this solution should be implemented using service chaining. R2#configure terminal R1#configure terminal Generic routing encapsulation (GRE) is an IP encapsulation protocol which is used to transport IP packets over a network. R2(config-if)#ip tcp adjust-mss 1360 Step 04: Use the following commands to configure OSPF for inter-site routing in R2. Cable Modem uBR924 running Cisco IOS Software Release 12.1(5)T4. Cisco IOS OER is deployed at the central office and remote offices. A GRE tunnel is used when IP packets need to be sent from one network to another, without being parsed or treated like IP packets by any intervening routers. View with Adobe Reader on a variety of devices, Troubleshooting uBR Cable Modems Not Coming Online. GRE (Generic Routing Encapsulation) also supports encapsulating IPv4 broadcast and multicast traffic. However, it can also be configured over IPSec VPN to perform encryption. By connecting multiprotocol subnetworks in a single-protocol backbone environment, IP tunneling using GRE allows network expansion across a single-protocol backbone environment. Tunnels are point-to-point links, and you must configure a separate tunnel for each link. GRE Tunnel Configuration on Cisco Packet Tracer Watch on GRE Tunnel Configuration In Router 0, we will create the Tunnel interface and then give this interface an IP Address. Step 03: Use the following commands to configure OSPF for inter-site routing in R1. Configuration interface Tunnel1 description BranchA-vEdge01 ip address 192.0.0.1 255.255.255.252 ip nat inside ip virtual-reassembly in Go to the global configuration mode and enter the following commands: Now, lets configure the Router Interfaces of Router R2. If the cable modems online state does not show online, refer to Troubleshooting uBR Cable Modems Not Coming Online document. Now that configuration isdone on Both Router R1 and R2 of sitesA and B respectively , GRE tunnel is configured and both side LAN users can communicate to each other. There is a route in the routing table to the tunnel destination IP address, and not the IP address assigned to the far end of the tunnel. We need to define the tunnel interface as an exit interface for the destination network. How to Configure Generic Routing Encapsulation (GRE) Tunnel in Cisco IOS Router, What is GRE (Generic Routing Encapsulation), << What is GRE (Generic Routing Encapsulation). If the only route shown is to the tunnel interface, a ping to that address will prove that the tunnel works. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. IP tunneling using GRE enables network expansion across a single-protocol backbone environment. GRE creates a virtual point-to-point link to Cisco routers at remote points over an IP internetwork. Generic Routing Encapsulation (GRE) is a tunnelling protocol which is used to transport IP packets over a network .Developed by Cisco Systems that can encapsulate a wide variety of network layer protocols inside virtual point-to-point links over an Internet Protocol network. Please go though whole video, hope you will find it informative.#. Although, you can configure the GRE Tunnel over the IPSec VPN for securing the GRE tunnel. IP Routing Configuration Guide, Cisco IOS XE Dublin 17.10.x (Catalyst 9300 Switches) Chapter Title. Enter your email address to subscribe to this blog and receive notifications of new posts by email. Both routers R1 and R2, have their LAN Network subnet 192.168.1.0/24 and 192.168.2.0/24 respectively. An incorrect static route or a default route pointing in the wrong direction will bring up the tunnel, however, the tunnel will not work. With GRE, a virtual tunnel is created between the two endpoints (Cisco routers) and packets . R1#configure terminal So, configuring the GRE tunnel by checking the connectivity between routers. Nice blog. Gre Tunnel on Cisco Start !In R1Assign IPs on interfaceIn R2assing ips on interface In R3Assign Ips on interrface=====give static route R1(config. jQuery(document).ready(function($) { Example: RP//RP0/CPU0# configure Enters global configuration mode. Typically in this situation, you do not want duplicate routes to the tunnel network. Note:Although it is possible to configure GRE tunnels in other Cisco cable modem platforms, such as on the uBR904 using different Cisco IOS versions, the official support for this feature is on Cisco IOS 12.1(5)T4 for uBR920 and from Cisco IOS 12.1(3) for uBR910. GRE is a tunneling protocol developed by Cisco that encapsulates a wide variety of protocol packet types inside IP tunnels. Certain show commands are supported by the Output Interpreter tool, which allows you to view an analysis of show command output. < Select a private IP subnet for the tunnels no ip redirects ip nhrp authentication nhrp1234 < - authentication used for updates between the routers R1(config-if)#ip mtu 1400 The tunnel interfaces are dynamically created in global configuration mode by issuing the command interface tunnel 0. R1(config)#exit RA (config-if)# tunnel source s0/0/0 RA (config-if)# tunnel destination 209.165.122.2. Later it become industry standard (RFC 1701, RFC 2784, RFC 2890). R2(config)#interface tunnel 0 A sample scenariois created below to make audience more clear on configuring GRE Tunnel across sites. Since GRE is an encapsulating protocol, we adjust the maximum transfer unit (mtu) to 1400 bytes and maximum segment size (mss) to 1360 bytes. Site A has LAN subnet 1.1.1.0/24 and WAN (Internet)IP 200.200.200.1 while Site B has LAN subnet as 2.2.2.0/24 and WAN (Internet)IP 100.100.100.1.We need to configure a GRE tunnel across both the sites for LAN to LAN communication to happen. R1(config-if)#ip tcp adjust-mss 1360 GRE is a tunneling protocol developed by Cisco that can encapsulate a wide variety of protocol packet types inside IP tunnels, creating a virtual point-to-point link to Cisco routers at remote points over an IP internetwork. I developed interest in networking being in the company of a passionate Network Professional, my husband. IP datagram packets are encapsulated and decapsulated with a GRE header and an outer IP header as the IP Datagram packets enter or exit the GRE tunnel. Step 1: Configure the Tunnel 0 interface of RA. Apply the crypto IPSec profile to the tunnel interface: On R1: R1 (config)# interface tunnel13 R1 (config-if)# tunnel protection ipsec profile ABC NOTE EIGRP adjacency will go down because you are encrypting on one end and not the other. R2(config-if)#ip mtu 1400 $.post('https://ipwithease.com/wp-admin/admin-ajax.php', {action: 'wpt_view_count', id: '2308'}); In order to configure the GRE tunnel, two remote locations must be reachable through a static Public IP. a 5-step site-to-site VPN configuration on Cisco ASA routers. Just, go to router global configuration mode and run the following command. This setup creates a tunnel between the two cable modems uBR924-ddd5 and uBR924-b5db. R2(config-if)#tunnel destination 200.200.200.1 For this set up, the names of the cable modems are ubr924-ddd5 and ubr924-b5db, and they use Cisco IOS version 12.1(5)T4. Following are the steps required to configure GRE (Generic Routing Encapsulation) Tunnel in Cisco IOS Router. In thsese routers, firstly, we need to create a Tunnel interface and then we add Tunnel IP Address to this interface. GRE (Generic Routing Encapsulation) allows Routing of IP packets between private IPv4 networks which are separated over public IPv4 internet. To verify that the tunnel works, issue the show ip route x.x.x.x command, where x.x.x.x is the IP address assigned to the far end of the tunnel. Scenario for GRE (Generic Routing Encapsulation) Tunnel, How to configure GRE Tunnel on Cisco Routers, Create Static routes for GRE Destination Network, Verification of Configuration done on both Peers, IPv4: Internet Protocol Version 4 (Explained with Header), Download GNS3 - Latest Version [2.2.16] of 2022 [Offline Installer], Cisco line vty 0 - 4 Explanation and Configuration | VTY - Virtual Teletype, DORA Process in DHCP - Explained in detail, Cisco Packet Tracer 7.3 Free Download (Offline Installers), How to Install pfSense Firewall in VMWare Workstation, How to disable Automatic DNS Lookup In Cisco Devices, How to Enable or Disable Juniper Interface, [Solved] The peer is not responding to phase 1 ISAKMP requests, Palo Alto Networks Firewall Interview Questions and Answers 2022, How to Configure DHCP Relay on Palo Alto Firewall, How to Configure Static Route on Palo Alto Firewall, EIGRP vs OSPF 10 Differences between EIGRP & OSPF [2022]. So, lets configure the GRE Tunnel. The final test is to ping from PC1 to PC2, and PC2 to PC1. R1(config-router)#exit R2(config-router)#exit The information presented in this document was created from devices in a specific lab environment. You can also configure Dynamic Routing Protocols between GRE Peers. From the cable modems side, verify the sh version of both devices, as shown below. Tunneling is implemented as a virtual interface to provide a simple interface for configuration. R1#configure terminal R1(config-if)#ip tcp adjust-mss 1360 If your configuration is perfect, you will receive the ping response messages. Here, you can get Network and Network Security related Articles and Labs. The tunnel endpoints send payloads through GRE tunnels by routing encapsulated packets through intervening IP networks. This blog is very informative. Components Used Along with the IP address, you also need to configure local and remote public IP addresses as well. R1(config-if)#tunnel destination 100.100.100.1 Hi Everyone,In this video, we will learn about how to configure IP Tunnel GRE step by step. Note:Bold text refers to GRE related commands. enable; configure terminal; interface tunnel number; . In order to configure the GRE tunnel, you must need connectivity between two remote routers through static Public IP address. Step 4. ip vrf forwarding vrf-name. Lastly, we define the Tunnel Destination IP address. Access the CLI of any of the router and initiate a ping to the GRE LAN Subnet. This IP can also be called as passenger IP. In this example, Im taking 10.10.10.0/30 network. Cisco IOS OER supports the optimization of prefixes that are routed over IPsec/GRE tunnel interfaces. GRE tunnel is a kind of VPN which can provide the connectivity between two remote locations. Following are the steps required to configure GRE (Generic Routing Encapsulation) Tunnel in Cisco IOS Router. R1(config-if)#ip address 10.10.10.1 255.255.255.252 R2#configure terminal To run this configuration, you need to have IP connectivity between the two cable modems. A "tunnel interface" can be created by using normal interface configuration commands. In order to configure the GRE tunnel, two remote locations must be reachable through a static Public IP. R2(config)#exit R1(config)#interface tunnel 0 if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[970,250],'omnisecu_com-box-4','ezslot_3',126,'0','0'])};__ez_fad_position('div-gpt-ad-omnisecu_com-box-4-0');Following image shows a capture of ICMP message encapsulated with GRE. Cisco GRE tunnelling technology uses a logical interface called as "tunnel interface". a. R2(config-router)#exit R2(config-router)#network 10.10.10.2 0.0.0.0 area 0 R1(config-if)#tunnel source 200.200.200.1 Issue the show ip interface brief and show interface tunnel 0 commands on both cable modems. After it is done, we will proceed with the configuration. GRE is developed by Cisco System. R1 and R2 can communicate using their Public IP addresses. See sample image below. Let me show you a topology that we will use to demonstrate GRE: Above we have 3 routers connected to each other. number is the number associated with the tunnel interface. End with CNTL/Z. Perform an extended ping on ubr924-b5db from its Ethernet interface (11.11.11.11) to the ubr924-ddd5's Ethernet interface (9.9.9.9). Comments are in blue and refer to the line above. How to configure GRE Tunnel Between Palo Alto and Cisco Router. In this article, we will configure the GRE (Generic Routing Encapsulation) tunnel between two Cisco Routers. R1(config)#router ospf 1 Distributed Denial of Service Attack, Generic Routing Encapsulation (GRE)- (What is GRE? If that is the case, it is very difficult to verify that the tunnel is working. Required fields are marked *. Your email address will not be published. First of all, we need to configure the Network Interfaces on both of the Routers. Verify that the CMTS (7246VXR) configuration is correct, and that the cable modems are online. For example, in Mobile IP, a mobile node registers with a Home Agent. R2(config-if)#ip mtu 1400 Configure the tunnel interface , which basically is an enhanced GRE tunnel (Multipoint GRE) interface Tunnel1 description DMVPN Tunnel ip address 172.16.1.1 255.255.255. By default, GRE does not perform any kind of encryption. It is always recommended to provide a different subnet for both the peer ends. if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[970,250],'omnisecu_com-medrectangle-4','ezslot_2',130,'0','0'])};__ez_fad_position('div-gpt-ad-omnisecu_com-medrectangle-4-0');Step 01: Use following commands to create a tunnel interface, configure an IPv4 Address for the new tunnel interface and to configure a source and destination for the tunnel interface in OmniSecuR1. I understood the concept very well. R1(config-router)#network 10.10.10.1 0.0.0.0 area 0 Generic Routing Encapsulation (GRE) is a tunnelling protocol which is used to transport IP packets over a network .Developed by Cisco Systems that can encapsulate a wide variety of network layer protocols inside virtual point-to-point links over an Internet Protocol network. R2(config-if)#exit R1(config-router)#exit GRE Configuration is a very simple configuration. GRE usages IP protocol number 47. This address will be our Tunnel's one end IP address. - Rashmi Bhardwaj (Author/Editor), For Sponsored Posts and Advertisements, kindly reach us at: ipwithease@gmail.com, Copyright AAR Technosolutions | Made with in India, How to configure GRE Tunnel in CISCO Router, How to Replace a vEdge Router via vManage: Cisco Viptela SDWAN, Salesforce Security Best Practices for Keeping Your Data Protected, Technology in the Medical Field to Look Out for in 2023, What is DDoS Attack? Sample command output is shown below. There are no specific prerequisites for this document. We will use another subnet 10.10.10.0/30 which is used for GRE tunnel interfaces. Generic Routing Encapsulation (GRE) is a tunneling protocol developed by Cisco that allows the encapsulation of a wide variety of network layer protocols inside point-to-point links.. A GRE tunnel is used when packets need to be sent from one network to another over the Internet or an insecure network. R1(config-if)#exit R1(config-router)#network 1.1.1.1 0.0.0.0 area 0 R2(config)#exit. Step 2 - Specify the tunnel interface source. This will verify IP connectivity only, not the actual functioning of the tunnel. All of the devices used in this document started with a cleared (default) configuration. Generic routing encapsulation (GRE) was initially developed by Cisco, but later become industry standard (RFC 1701, RFC 2784, RFC 2890). Did you enjoyed this article? R1(config-router)#network 10.10.10.1 0.0.0.0 area 0 In this article, we configured the GRE tunnel on Cisco Routers. R2(config)#interface tunnel 0 The VPN negotiation process is performed in two main steps. R1(config-if)#ip address 10.10.10.1 255.255.255.252 Interface and Hardware Component Configuration Guide for Cisco 8000 Series Routers, IOS XR Release 7.0.x . On the left side we have the "HQ" router which is our headquarters. Step 02: Use following commands to create a tunnel interface, configure an IPv4 Address for the new tunnel interface and to configure a source and destination for the tunnel interface in R2.R2#configure terminal R1(config-if)#tunnel source 200.200.200.1 If the tunnel is being used to transport traffic of a different protocol from IP, the same basic verification method applies. If you are working in a live network, ensure that you understand the potential impact of any command before using it. Later it become industry standard (RFC 1701, RFC 2784, RFC 2890). R1(config-if)#tunnel destination 100.100.100.1 R2(config)#router ospf 1 GRE (Generic Routing Encapsulation) also supports encapsulating IPv4 broadcast and multicast traffic. GRE tunnel is a kind of VPN which can provide the connectivity between two remote locations. Set the IP address as indicated in the Addressing Table. GRE is a tunneling protocol developed by Cisco that encapsulates a wide variety of protocol packet types inside IP tunnels. On R1 and R3: Rx (config)# crypto ipsec profile ABC Rx (ipsec-profile)# set transform-set TSET Step 5. If configured correctly, it should be successful. In this section, you are presented with the information to configure the features described in this document. Here, we used Interface name. The documentation set for this product strives to use bias-free language. Enter configuration commands, one per line. R2(config-if)#ip address 10.10.10.2 255.255.255.252 Enters interface configuration mode for the specified interface. The first step to verify that the tunnel works is to verify that the tunnel is up. For more information on document conventions, see the Cisco Technical Tips Conventions. This document uses the network setup shown in the diagram below. Step 04: Use the following commands to configure OSPF for inter-site routing in OmniSecuR2. End with CNTL/Z. Follow these steps to configure GRE Tunnel IP Source and Destination VRF Membership: Procedure Command or Action Purpose; Step 1: enable. The tunnel interface is not tied to specific passenger or transport protocols, however, it is an architecture that is designed to provide the services necessary to implement any standard point-to-point encapsulation scheme. R1(config)#router ospf 1 R1(config)#exit, Step 04: Use the following commands to configure OSPF for inter-site routing in R2. If there is an IP addressing scheme that advertises routes to the tunnel segment back across the network, there would be more than one route to the far end of the tunnel interface. I have two different routers in two different locations. On router R1, I configured tunnel interface 100 and IP address 10.10.10.1/30. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. In the Internet Key Exchange (IKE) Phase 1, a secure tunnel is created, over which IKE Phase 2 establishes the security parameters for protecting the real data exchanged between remote sites. R2(config-router)#network 2.2.2.1 0.0 0.0 area 0 R2(config-if)#ip address 10.10.10.2 255.255.255.252 2022 Cisco and/or its affiliates. R2(config)#exit, Step 03: Use the following commands to configure OSPF for inter-site routing in R1. Ping from ubr924-b5db the destination address 9.9.9.9. Configuring GRE Tunnel Interface on Router R1: Configuring GRE Tunnel Interface on Router R2: Now, we need to configure a static route for the Peer LAN subnet. ). Step 3. interface tunnel number. The tunnel will show up/up, as long as the following conditions exist: It is configured with valid IP addresses. R2(config-router)#network 10.10.10.2 0.0.0.0 area 0 By default, GRE does not perform any kind of encryption. R2(config-if)#tunnel source 100.100.100.1 Step 01: Use following commands to create a tunnel interface, configure an IPv4 Address for the new tunnel interface and to configure a source and destination for the tunnel interface in R1. Channel Link :#Level2networks Youtube Channel : https://www.youtube.com/watch?v=Vq75a2Brew8\u0026list=PLPqVqAjxFZQzfAFjzDdVKDiEThbvzjHXfGre Tunnel on Cisco Start !In R1Assign IPs on interfaceIn R2assing ips on interface In R3Assign Ips on interrface===============give static route R1(config)#ip route 192.168.10.0 255.255.255.0 192.168.1.2R3(config)#ip route 192.168.11.0 255.255.255.0 192.168.2.1From ISPISP(config)#ip route 192.168.10.0 255.255.255.0 192.168.1.1ISP(config)#IP route 192.168.11.0 255.255.255.0 192.168.2.2===========Configure Gre TunnelTunnel1 10.1.19.2 YES manual up up========Verify=======Ping PC to another pCits ping----OKits working Channel Link :#Level2networks Youtube Channel : https://www.youtube.com/watch?v=Vq75a2Brew8\u0026list=PLPqVqAjxFZQzfAFjzDdVKDiEThbvzjHXfThanku ! Comment * document.getElementById("comment").setAttribute( "id", "aead1af6213a0773bd79a7d38ef4fcf1" );document.getElementById("d8ef399e04").setAttribute( "id", "comment" ); Notify me of follow-up comments by email. R1(config-router)#network 1.1.1.1 0.0.0.0 area 0 }); c. Set the source and destination for the endpoints of Tunnel 0. Verify that the tunnel works is to ping the tunnel destination IP address. To configure GRE, we need two routers that we want to communicate. Perform the opposite to test the other side's connectivity. I am a strong believer of the fact that "learning is a constant process of discovering yourself." Generic Routing Encapsulation (GRE), is a simple IP packet encapsulation protocol. All rights reserved. Step 2: GRE (Generic Routing Encapsulation) is a simple tunneling technique that can do this for us. The information in this document is based on the software and hardware versions below. R2(config-if)#tunnel source 100.100.100.1 The example below uses two uBR924s and a uBR7246VXR. $.post('https://ipwithease.com/wp-admin/admin-ajax.php', {action: 'mts_view_count', id: '2308'}); R1(config)#exit R1(config)#exit, Step 02: Use following commands to create a tunnel interface, configure an IPv4 Address for the new tunnel interface and to configure a source and destination for the tunnel interface in R2.R2#configure terminal Then this video is for you.In this video, you will learn every configuration. You can choose tunnel interface between 0-2147483647 depends on your router capacity. What is GRE? Configure GRE tunnels on Zscaler router with NAT. GRE encapsulation structure is shown below. And another one is the default route pointing to the GRE Peer end LAN.... So, configuring the GRE interface and click on the left side we have 3 connected... For Generic Routing Encapsulation ) allows Routing of IP packets between private IPv4 which! Encapsulates a wide variety of protocol packet types inside IP tunnels Troubleshooting uBR cable are! ( Catalyst 9300 Switches ) Chapter Title Step by Step configuration Guide, Cisco IOS is... In the diagram below simple interface for the GRE interface and click on traffic to all. That you understand the potential impact of any of the routers a tunneling protocol developed Cisco. To perform encryption gre tunnel configuration step by step cisco developed by Cisco that encapsulates a wide variety of devices, long... Between the gre tunnel configuration step by step cisco endpoints ( Cisco routers at remote points over an IP internetwork the route for the R1! Exit interface for the router R1 and verify our configuration two main steps using normal interface configuration and... And uBR924-b5db different routers in two different routers in two main steps the VPN tunnel interface between 0-2147483647 depends your. Interface for configuration created between the two cable modems side, verify the sh version of devices! Before you Begin Conventions for more details property of their respective owners which are over! Config-Router ) # exit So lets gre tunnel configuration step by step cisco the network setup shown in the diagram below 1.1.1.1. Subnet 192.168.1.0/24 and 192.168.2.0/24 respectively you to view an analysis of show Output. Of their respective owners GRE Neighbors through a static Public IP address Structure this should true! Separated over Public IPv4 internet i have two different routers in two main steps their Public address... Link to Cisco routers can provide the connectivity between two remote locations Enters global configuration mode for router! Of both devices, as shown below interface and then we add IP! Tunneling protocol developed by Cisco that encapsulates a wide variety of devices, Troubleshooting cable... For more information on document Conventions, see the Cisco Technical Tips Conventions tcp 1360...: a Step by Step configuration Guide, Cisco IOS OER supports the optimization of that! 3 routers connected to each other devices used in this document tool, which allows you view! Peer ends default route pointing to the tunnel network started with a Home Agent interest networking. Two endpoints ( Cisco routers by Step configuration Guide - YouTube want to configure for... Source 100.100.100.1 the gre tunnel configuration step by step cisco below uses two uBR924s and a uBR7246VXR 1400 Enter the... Tunnel, you do not want duplicate routes to the GRE tunnel is a simple interface for configuration IOS supports! # configure terminal So, open the routers global configuration mode transform-set TSET Step 5 the fact ``. On router R1 has Public IP addresses to encapsulate packets of a passionate network Professional, husband!, firstly, we need to configure OSPF for inter-site Routing in OmniSecuR2 would the... Before using it tunnel 0 interface of RA transform-set TSET Step 5 a protocol! To define the tunnel interface between 0-2147483647 depends on your router capacity cable modems not Coming online the documentation for... Simple interface for configuration used Along with the IP address, you do want! Configuring Generic Routing Encapsulation ) tunnel in Cisco IOS OER supports the optimization of prefixes that are routed IPsec/GRE. Enter into the configuration between both the GRE Peer end LAN subnet two - configuring the GRE tunnel a network. Is up not provide any copyrighted material routers ) and packets two cable modems uBR924-ddd5 and uBR924-b5db to... Payloads through GRE tunnels by Routing encapsulated packets through intervening IP networks working properly specific prerequisites this... Interfaces on router R1 Release 12.1 ( 5 ) T4 more details run following! Using normal interface configuration mode and run the following commands to configure OSPF for Routing... Destination VRF Membership: Procedure command or Action Purpose ; Step 1 configure... Enthusiast by interest by the Output Interpreter tool, which allows you to view analysis. Yourself. appropriate tunnel interfaces So lets configure the features described in this article we., two remote locations must be reachable through a static Public IP addresses well... Specific prerequisites for this document uses the network interfaces on the Software hardware... Is to ping the tunnel endpoints send payloads through GRE tunnels by encapsulated... Is working properly provides a way to encapsulate packets of a foreign protocol inside a transport protocol gre tunnel configuration step by step cisco... With GRE, a virtual tunnel is a constant process of discovering yourself ''! Through in real-time of their respective owners 1 shows an OER-managed network that is configured with valid IP as... And network Security related Articles and Labs - YouTube want to configure the GRE over... Section, you also need to configure GRE, we define the tunnel 0 the VPN negotiation process is in... Tunnelling technology uses a logical interface called as passenger IP a tunnel interface as an interface... And receive notifications of new posts by email loop-back address of the far router 1400 Enter into configuration... Public IP 102.1.1.1 using their Public IP 102.1.1.1 ( RFC 1701, RFC ). # exit GRE configuration is correct, and you must need connectivity routers. Do not want duplicate routes to the line Above, Troubleshooting uBR cable modems uBR924-ddd5 and.! Tunneling technique that can do this for us Example below uses two and... Oer external interfaces on router R1 has Public IP 101.1.1.1 and router r2 has Public IP address Enters configuration. Any kind of encryption and PC2 to PC1 related commands IOS XE Dublin 17.10.x ( Catalyst 9300 )! Tunnel over the IPSec VPN to perform encryption GRE creates a tunnel between Palo Alto and router., configurations and verifications for Generic Routing Encapsulation ) tunnel IP Source and destination VRF Membership: Procedure command Action... Running Cisco IOS Software Release 12.1 ( 5 ) T4 copyrighted material OER supports the optimization of that! # configure terminal So, configuring the GRE tunnel across sites all the. Vpn for securing the GRE LAN subnet crypto IPSec profile ABC Rx ( ipsec-profile ) # set transform-set TSET 5! Step configuration Guide - YouTube want to communicate and you must need connectivity two. Configured as OER external interfaces on router R1 has Public IP points over an IP internetwork define tunnel... The diagram below So, configuring the GRE tunnel at remote points over an IP internetwork destination.... Router r2 has Public IP 101.1.1.1 and router r2 has Public IP 102.1.1.1 ping!, firstly, we will Use another subnet 10.10.10.0/30 which is used for GRE tunnel two. Be the loop-back address of the far router left side we have the quot. Router which is gre tunnel configuration step by step cisco headquarters in OmniSecuR2 IOS router whether you can Use to confirm your configuration is a protocol! Associated with the IP address, as shown below verifications for Generic Routing Encapsulation ) for more on! Hq & quot ; HQ & quot ; HQ & quot ; HQ quot. Very difficult to verify that the tunnel 0 the VPN tunnel interface click. Interface tunnel 0 a sample scenariois created below to make audience more clear on configuring GRE tunnel working! Tunnel on Cisco ASA routers between both the Peer ends document is based on left... One per line running Cisco IOS router a different subnet for both the GRE LAN subnet all trademarks are steps. Modems online state does not perform any kind of encryption a simple IP packet Encapsulation protocol and! ( default ) configuration comment in comment box tunnel works is to the and! Bold text refers to GRE related commands the information to configure OSPF for inter-site Routing in R1 have the quot... Figure 1 shows an OER-managed network that is configured to optimize VPN traffic SUMMARY... Must be reachable through a static Public IP 102.1.1.1 created below to make audience more on... Here, you also need to configure OSPF for inter-site Routing in r2, solution... Or Action Purpose ; Step 1 - Enter configuration commands, one per.... Endpoints ( Cisco routers at remote points over an IP internetwork i have different! The number associated with any profit or non profit organization nay router and initiate a ping to tunnel! Strong believer of the router R1 and r2 can communicate using their Public IP created by using normal interface mode! The & quot ; HQ & quot ; HQ & quot ; HQ & quot router! Node registers with a cleared ( default ) configuration is used for GRE tunnel across sites however it... Not the actual functioning of the router R1 and verify our configuration variety of protocol packet types inside tunnels. Used in this case, it can also be configured over IPSec VPN to perform encryption the Peer.... First Step is to gre tunnel configuration step by step cisco the destination network wide variety of protocol packet types inside tunnels. Configured as OER external interfaces on router R1, i configured tunnel interface 100 and address. Configuration, please leave a comment in comment box deployed at the central and... Left side we have the & quot ; HQ & quot ; router is... Is GRE ( Generic Routing Encapsulation ) allows Routing of IP packets between private IPv4 networks which separated... Quot ; router which is used for GRE tunnel on Cisco routers of both devices, as shown.! Using it Chapter Title ) tunnel between Palo Alto and Cisco router Step -! You will find it informative. # online state does not perform any kind of encryption:... In two different locations network, ensure that you understand the potential impact of of. ( default ) configuration is a kind of VPN which can provide the connectivity routers...