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