There is currently no specific troubleshooting information available for this configuration. There are no specific prerequisites for this document. $.post('https://ipwithease.com/wp-admin/admin-ajax.php', {action: 'mts_view_count', id: '2308'}); GRE encapsulation structure is shown below. < Select a private IP subnet for the tunnels no ip redirects ip nhrp authentication nhrp1234 < - authentication used for updates between the routers Step 1: configure. Comments are in blue and refer to the line above. By default, GRE does not perform any kind of encryption. And its very interesting topic. By connecting multiprotocol subnetworks in a single-protocol backbone environment, IP tunneling using GRE allows network expansion across a single-protocol backbone environment. 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. Example: Device (config)#interface tunnel 0. Comment * document.getElementById("comment").setAttribute( "id", "aead1af6213a0773bd79a7d38ef4fcf1" );document.getElementById("d8ef399e04").setAttribute( "id", "comment" ); Notify me of follow-up comments by email. Follow these steps to configure GRE Tunnel IP Source and Destination VRF Membership: SUMMARY STEPS. Generic Routing Encapsulation (GRE), is a simple IP packet encapsulation protocol. Set the IP address as indicated in the Addressing Table. - 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? R1(config-router)#network 1.1.1.1 0.0.0.0 area 0 This section provides information you can use to confirm your configuration is working properly. Tunneling is implemented as a virtual interface to provide a simple interface for configuration. Now, we have finished the configuration between both the GRE Neighbors. R2(config-if)#exit R1#configure terminal Tunnels are point-to-point links, and you must configure a separate tunnel for each link. GRE usages IP protocol number 47. Later it become industry standard (RFC 1701, RFC 2784, RFC 2890). R1(config-if)#exit To verify that PC1 can access PC2 and vice versa, perform extended pings on the cable modems, and also pings from the PCs . A sample scenariois created below to make audience more clear on configuring GRE Tunnel across sites. 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. All rights reserved. 2022 Cisco and/or its affiliates. R2(config-if)#tunnel destination 200.200.200.1 Now, we will initiate a ping for the Router R1 and verify our configuration. 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. GRE Tunnels: A Step By Step Configuration Guide - YouTube Want to configure a GRE Tunnel with ease? 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. How to configure GRE Tunnel Between Palo Alto and Cisco Router. jQuery(document).ready(function($) { I developed interest in networking being in the company of a passionate Network Professional, my husband. Step 3. interface tunnel number. In order to configure the GRE tunnel, two remote locations must be reachable through a static Public IP. View with Adobe Reader on a variety of devices, Troubleshooting uBR Cable Modems Not Coming Online. Shown above are 2 Sites Site A and Site B. Both routers R1 and R2, have their LAN Network subnet 192.168.1.0/24 and 192.168.2.0/24 respectively. GRE is a tunneling protocol developed by Cisco that encapsulates a wide variety of protocol packet types inside IP tunnels. Hi Everyone,In this video, we will learn about how to configure IP Tunnel GRE step by step. Configure Branch vEdges to route all unknown traffic to route using Zscaler Cloud router, this solution should be implemented using service chaining. R1(config-router)#network 10.10.10.1 0.0.0.0 area 0 R1(config-router)#network 10.10.10.1 0.0.0.0 area 0 R2#configure terminal Here, we used Interface name. If you are facing any issue during GRE Tunnel configuration, please leave a comment in comment box! All trademarks are the property of their respective owners. R1#configure terminal R2(config-if)#ip tcp adjust-mss 1360 GRE (Generic Routing Encapsulation)allows Routing of IP packets between private IPv4 networks which are separated over public IPv4 internet. R2(config)#exit Configuration interface Tunnel1 description BranchA-vEdge01 ip address 192.0.0.1 255.255.255.252 ip nat inside ip virtual-reassembly in 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]. After that, we we will define the Tunnel Source, with IP Address or with Interface name. By default, GRE does not perform any kind of encryption. GRE creates a virtual point-to-point link to Cisco routers at remote points over an IP internetwork. 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. a. R1(config-router)#exit Issue the show ip interface brief and show interface tunnel 0 commands on both cable modems. R2(config-router)#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 OmniSecuR2. Cable Modem uBR924 running Cisco IOS Software Release 12.1(5)T4. Steps should be taken to prevent the advertisement of the routes by a routing protocol across the network. 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. The final test is to ping from PC1 to PC2, and PC2 to PC1. How to Configure Generic Routing Encapsulation (GRE) Tunnel in Cisco IOS Router, What is GRE (Generic Routing Encapsulation), << What is GRE (Generic Routing Encapsulation). }); 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. Did you enjoyed this article? 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. 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). ). If the only route shown is to the tunnel interface, a ping to that address will prove that the tunnel works. R1(config)#interface tunnel 0 In this section, you are presented with the information to configure the features described in this document. This will verify IP connectivity only, not the actual functioning of the tunnel. Interface and Hardware Component Configuration Guide for Cisco 8000 Series Routers, IOS XR Release 7.0.x . So, configuring the GRE tunnel by checking the connectivity between routers. I am a strong believer of the fact that "learning is a constant process of discovering yourself." This blog is very informative. Step 2: Your email address will not be published. R2(config-if)#tunnel source 100.100.100.1 IP Routing Configuration Guide, Cisco IOS XE Dublin 17.10.x (Catalyst 9300 Switches) Chapter Title. R2(config)#interface tunnel 0 All of the devices used in this document started with a cleared (default) configuration. This document uses the configurations shown below. jQuery(document).ready(function($) { Verify that the CMTS (7246VXR) configuration is correct, and that the cable modems are online. 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. 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. Configure GRE tunnels on Zscaler router with NAT. Cisco IOS OER supports the optimization of prefixes that are routed over IPsec/GRE tunnel interfaces. Since GRE is an encapsulating protocol, we adjust the maximum transfer unit (mtu) to 1400 bytes and maximum segment size (mss) to 1360 bytes. Distributed Denial of Service Attack, Generic Routing Encapsulation (GRE)- (What is GRE? In thsese routers, firstly, we need to create a Tunnel interface and then we add Tunnel IP Address to this interface. 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." Cisco GRE tunnelling technology uses a logical interface called as "tunnel interface". On R1 and R3: Rx (config)# crypto ipsec profile ABC Rx (ipsec-profile)# set transform-set TSET Step 5. 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. Access the CLI of any of the router and initiate a ping to the GRE LAN Subnet. The documentation set for this product strives to use bias-free language. The GRE tunnel behave as virtual point-to-point link that have two endpoints identified by the tunnel source and tunnel destination address. 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 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). R2(config)#interface tunnel 0 However, it can also be configured over IPSec VPN to perform encryption. R1(config-if)#ip address 10.10.10.1 255.255.255.252 By default, GRE does not perform any kind of encryption. R1(config-router)#exit 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. 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. Step 4. ip vrf forwarding vrf-name. The tunnel will show up/up, as long as the following conditions exist: It is configured with valid IP addresses. Step 1: Configure the Tunnel 0 interface of RA. R2(config-router)#exit In this example, Im taking 10.10.10.0/30 network. Step 04: Use the following commands to configure OSPF for inter-site routing in R2. R2(config-if)#ip address 10.10.10.2 255.255.255.252 Lastly, we define the Tunnel Destination IP address. R1(config-if)#ip address 10.10.10.1 255.255.255.252 number is the number associated with the tunnel interface. 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. We will use another subnet 10.10.10.0/30 which is used for GRE tunnel interfaces. Note:Bold text refers to GRE related commands. 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. GRE tunnel is a kind of VPN which can provide the connectivity between two remote locations. R2(config-if)#ip address 10.10.10.2 255.255.255.252 RA (config-if)# tunnel source s0/0/0 RA (config-if)# tunnel destination 209.165.122.2. If your configuration is perfect, you will receive the ping response messages. R1(config)#router ospf 1 Follow these steps to configure GRE Tunnel IP Source and Destination VRF Membership: Procedure Command or Action Purpose; Step 1: enable. A "tunnel interface" can be created by using normal interface configuration commands. R1#configure terminal Required fields are marked *. R2(config-if)#tunnel source 100.100.100.1 An incorrect static route or a default route pointing in the wrong direction will bring up the tunnel, however, the tunnel will not work. The VPN negotiation process is performed in two main steps. Verify that the tunnel works is to ping the tunnel destination IP address. The configuration of the CMTS is shown below. R2(config)#router ospf 1 . Along with the IP address, you also need to configure local and remote public IP addresses as well. What is GRE? I understood the concept very well. Enters interface configuration mode for the specified interface. 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 am a biotechnologist by qualification and a Network Enthusiast by interest. The tunnel interfaces are dynamically created in global configuration mode by issuing the command interface tunnel 0. R1(config)#exit, Step 04: Use the following commands to configure OSPF for inter-site routing in R2. So, open the routers global configuration mode and run the following commands in global configuration mode. This IP can also be called as passenger IP. If configured correctly, it should be successful. GRE encapsulation structure is shown below GRE Encapsulation Structure 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. 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. Later it become industry standard (RFC 1701, RFC 2784, RFC 2890). GRE (Generic Routing Encapsulation) allows Routing of IP packets between private IPv4 networks which are separated over public IPv4 internet. Now, we will configure the GRE tunnel interface. Configuring Generic Routing Encapsulation(GRE) Tunnel IP Source and Destination VRF Membership . Enter into the configuration mode for RA Tunnel 0. b. We need to define the tunnel interface as an exit interface for the destination network. R2(config)#exit. R2(config-router)#network 2.2.2.1 0.0 0.0 area 0 In order to configure the GRE tunnel, two remote locations must be reachable through a static Public IP. Following are the steps required to configure GRE (Generic Routing Encapsulation) Tunnel in Cisco IOS Router. The first step is to configure your firewall device with the appropriate tunnel interfaces. Copyright 2008 - 2022 OmniSecu.com. After it is done, we will proceed with the configuration. 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. Enter configuration commands, one per line. Following are the steps required to configure GRE (Generic Routing Encapsulation) Tunnel in Cisco IOS Router. 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. Step 03: Use the following commands to configure OSPF for inter-site routing in OmniSecuR1. To configure GRE, we need two routers that we want to communicate. This website is for Educational Purposes Only and not provide any copyrighted material. Refer What is GRE (Generic Routing Encapsulation) for more details. R1(config)#exit Generic routing encapsulation (GRE) is an IP encapsulation protocol which is used to transport IP packets over a network. End with CNTL/Z. 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 ! 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. You can choose tunnel interface between 0-2147483647 depends on your router capacity. End with CNTL/Z. Learn more about how Cisco is using Inclusive Language. On router R1, I configured tunnel interface 100 and IP address 10.10.10.1/30. Enter configuration commands, one per line. a 5-step site-to-site VPN configuration on Cisco ASA routers. R2#configure terminal Just, go to router global configuration mode and run the following command. R1 and R2 can communicate using their Public IP addresses. It is always recommended to provide a different subnet for both the peer ends. R2(config-if)#ip tcp adjust-mss 1360 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. The first step to verify that the tunnel works is to verify that the tunnel is up. Router R1 has Public IP 101.1.1.1 and Router R2 has Public IP 102.1.1.1. R1(config)#exit If the cable modems online state does not show online, refer to Troubleshooting uBR Cable Modems Not Coming Online document. R2(config-if)#tunnel destination 200.200.200.1 R1(config-if)#tunnel destination 100.100.100.1 R2(config)#exit IP tunneling using GRE enables network expansion across a single-protocol backbone environment. For example, in Mobile IP, a mobile node registers with a Home Agent. The example below uses two uBR924s and a uBR7246VXR. Go to the global configuration mode and enter the following commands: Now, lets configure the Router Interfaces of Router R2. Cisco IOS OER is deployed at the central office and remote offices. 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. See sample image below. 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. In this article, we configured the GRE tunnel on Cisco Routers. So lets configure the Network Interfaces on Router R1. For the official GNS3 website, visit gns3.com. Ping from ubr924-b5db the destination address 9.9.9.9. The tunnel endpoints send payloads through GRE tunnels by routing encapsulated packets through intervening IP networks. }); 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. This setup creates a tunnel between the two cable modems uBR924-ddd5 and uBR924-b5db. In order to configure the GRE tunnel, you must need connectivity between two remote routers through static Public IP address. R1(config)#interface tunnel 0 Enter your email address to subscribe to this blog and receive notifications of new posts by email. Example . In this case, it would be the loop-back address of the far router. Typically in this situation, you do not want duplicate routes to the tunnel network. GNS3Network.com is not associated with any profit or non profit organization. Although, you can configure the GRE Tunnel over the IPSec VPN for securing the GRE tunnel. This address will be our Tunnel's one end IP address. Tunneling provides a way to encapsulate packets of a foreign protocol inside a transport protocol. enable; configure terminal; interface tunnel number; R1(config-if)#tunnel source 200.200.200.1 GRE (Generic Routing Encapsulation) also supports encapsulating IPv4 broadcast and multicast traffic. This should be true regardless of whether you can ping the destination address. R1(config-if)#ip tcp adjust-mss 1360 Step 03: Use the following commands to configure OSPF for inter-site routing in R1. R2(config)#router ospf 1 Gre Tunnel on Cisco Start !In R1Assign IPs on interfaceIn R2assing ips on interface In R3Assign Ips on interrface=====give static route R1(config. Prerequisites There are no specific prerequisites for this document. R2(config-router)#network 10.10.10.2 0.0.0.0 area 0 R1(config-if)#ip mtu 1400 c. Set the source and destination for the endpoints of Tunnel 0. 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 . Nice blog. Let me show you a topology that we will use to demonstrate GRE: Above we have 3 routers connected to each other. Here, you can get Network and Network Security related Articles and Labs. Generic routing encapsulation (GRE) was initially developed by Cisco, but later become industry standard (RFC 1701, RFC 2784, RFC 2890). GRE (Generic Routing Encapsulation) is a simple tunneling technique that can do this for us. 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 R1(config-if)#tunnel source 200.200.200.1 Please go though whole video, hope you will find it informative.#. R1(config)#router ospf 1 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. R1(config-router)#network 1.1.1.1 0.0.0.0 area 0 I have two different routers in two different locations. This document contains descriptions, configurations and verifications for Generic Routing Encapsulation (GRE) in a cable environment. With GRE, a virtual tunnel is created between the two endpoints (Cisco routers) and packets . Part Two - Configuring the GRE tunnel on the Cisco router Step 1 - Enter configuration mode. R1(config-if)#ip mtu 1400 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. For more information on document conventions, see the Cisco Technical Tips Conventions. Then this video is for you.In this video, you will learn every configuration. Figure 1 shows an OER-managed network that is configured to optimize VPN traffic. If you are working in a live network, ensure that you understand the potential impact of any command before using it. 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. On the Miktotik, you can click on the GRE interface and click on traffic to see the traffics passing through in real-time. GRE Configuration is a very simple configuration. If that is the case, it is very difficult to verify that the tunnel is working. GRE is developed by Cisco System. R1#configure terminal Mirroring traffic to a GRE tunnel (also known as Encapsulated Remote Switched Port Analyzer [ER-SPAN] in Cisco IOS Software). All Rights Reserved. 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. R2(config-router)#network 2.2.2.1 0.0 0.0 area 0 R2(config)#exit, Step 03: Use the following commands to configure OSPF for inter-site routing in R1. However, it can also be configured over IPSec VPN to perform encryption. Example: RP//RP0/CPU0# configure Enters global configuration mode. 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. Your email address will not be published. This document uses the network setup shown in the diagram below. Sample command output is shown below. R2(config-if)#ip mtu 1400 If the tunnel is being used to transport traffic of a different protocol from IP, the same basic verification method applies. From the cable modems side, verify the sh version of both devices, as shown below. Enters global configuration mode. The first route is the default route pointing to the ISP and another one is the route for the GRE Peer end LAN subnet. First of all, we need to configure the Network Interfaces on both of the Routers. The VPN tunnel interface is configured as OER external interfaces on the master controller. GRE is a tunneling protocol developed by Cisco that encapsulates a wide variety of protocol packet types inside IP tunnels. Perform the opposite to test the other side's connectivity. 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. To run this configuration, you need to have IP connectivity between the two cable modems. R1(config-if)#ip tcp adjust-mss 1360 R1(config-if)#tunnel destination 100.100.100.1 Before You Begin Conventions For more information on document conventions, see the Cisco Technical Tips Conventions. Step 2 - Specify the tunnel interface source. Step 04: Use the following commands to configure OSPF for inter-site routing in OmniSecuR2. Just open the console of nay router and ping another end router. The information in this document is based on the software and hardware versions below. On the left side we have the "HQ" router which is our headquarters. GRE tunnel is a kind of VPN which can provide the connectivity between two remote locations. You can also configure Dynamic Routing Protocols between GRE Peers. In this article, we will configure the GRE (Generic Routing Encapsulation) tunnel between two Cisco Routers. $.post('https://ipwithease.com/wp-admin/admin-ajax.php', {action: 'wpt_view_count', id: '2308'}); So, lets configure the GRE Tunnel. Components Used R2(config-router)#network 10.10.10.2 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 R2(config-if)#ip mtu 1400 Certain show commands are supported by the Output Interpreter tool, which allows you to view an analysis of show command output. 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. GRE is initially defined in rfc1701. R1(config-if)#exit GRE (Generic Routing Encapsulation) also supports encapsulating IPv4 broadcast and multicast traffic. 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. The information presented in this document was created from devices in a specific lab environment. 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