The solution to this issue is to configure ip tcp adjust-mss 1436 on the tunnel interface. Please note when you are configuring youll need to replace the text in bold with the requisite addresses you received. tunnel bandwidth {receive | transmit} bandwidth no tunnel bandwidth Syntax Description receive I believe you can, although I havent tested it. Configure security policies. GRE Tunnel Configuration In Router 0, we will create the Tunnel interface and then give this interface an IP Address. Required fields are marked *. 48wt :-}kVtI FSgRZ7+@gp`!My~ABSr-Q64$N`/w~o6arJe+S1/D3/YNo&;iKl = /24 can reach each other while all traffic between the two networks is encrypted with IPSEC. Use Cisco Feature Navigator II ( registered customers only) and search for the GRE Tunnel IP Source and Destination VRF Membership feature, to obtain additional software and hardware requirements that you need. Find the right plan for you and your organization. Here's my configuration. Generic Routing Encapsulation Tunnel IP Source and Destination VRF Membership Cisco IOS 16.6.1 The Generic Routing Encapsulation Tunnel IP . Then, make sure to specify which interfaces on the router are internal and which are external. . Were including instructions for Cisco routers because they continue to be the most popular brand of enterprise routers and network switches. interface GigabitEthernet1 Protect your business for 30 days on Imperva. We use Elastic Email as our marketing automation service. It is a myth you have to adjust the MTU on the Tunnel interface. Success rate is 100 percent (5/5), round-trip min/avg/max . BGP Extended Communities for OSPF. Internet in a VPN. Comment * document.getElementById("comment").setAttribute( "id", "a0bb3bff2a491a9aa278c1504437ddb6" );document.getElementById("d8ef399e04").setAttribute( "id", "comment" ); Notify me of follow-up comments by email. Here, you can get Network and Network Security related Articles and Labs. ip address 192.168.2.1 255.255.255.0 R2 supports IPsec and R1 does not and we need to run BGP to support a diverse route from the Primary WAN connection. Made sure R1 tunnel destination match with R5 tunnel source and vice versa. The router sets the IP MTU internally to 1476 to prevent oversizing anyway. Over the years he has acquired several professional certifications such as CCNA, CCNP, CEH, ECSA etc. Mobile nodes access the Internet over Wi-Fi access points (APs). You can also configure Dynamic Routing Protocols between GRE Peers. Down Bit and Domain Tag. zu)h:j\as[r-ZS8A H#$n,zn}Yn;VO[%2. HWnGW@W @1Xb>pth5 [" EdyhfElOL8x?=:Z!N+JQZ/QKx?=BL_Vuvq/WKc}-ZJ2hKSnobDBP>&xY*gDEWb",RmE}wbl.bd~\.%./pW\ubik1[3b|8ptqL_`)\W;UL|>MDAU(?&. For ASA version prior to 8.3 the ACL would be as following: access-list OUT-IN extended permit gre host 50.50.50.1 host 30.30.30.3. Thanks for sharing your knowledge. Note that we reduce the MTU size in order to accommodate the extra headers added from the GRE protocol. So lets configure the Network Interfaces on Router R1. I have debug on outside router and when I ping from inside I can see that traffic arrives on outside routere. This should work. Both routers are connected to "the Internet" using the ISP router. Use these resources to familiarize yourself with the community: There is currently an issue with Webex login, we are working to resolve. This is exactly what makes this scenario a little bit different from others. Configurable tunnel source using IPv4/IPv6 address. tunnel source 50.50.50.1 This website is for Educational Purposes Only and not provide any copyrighted material. _f%t&j9)PJ31xS1OE$E:V MR*0ClJ-nL3h'Kz{,>f? document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Also, you allow me to send you informational and marketing emails from time-to-time. My ping is not working from inside to out or out to in. Therefore, can you support GRE over IPsec on R2 and have the IPSec terminate on the ASA and the GRE terminate on R1 to support BGP? Harris Andrea is an Engineer with more than two decades of professional experience in the fields of TCP/IP Networks, Information Security and I.T. Now if you ping a host to LAN2 from LAN1 (and vica-versa) you should get ICMP replies. ! And its very interesting topic. In order to configure the GRE tunnel, you must need connectivity between two remote routers through static Public IP address. Access the CLI of any of the router and initiate a ping to the GRE LAN Subnet. name2 is the name of an access list to use for matching traffic sourced by the server and forwarded via the tunnel. It can tunnel any layer 3 protocol including IP. From versions prior to 8.3, the opposite was true. You can not configure a GRE tunnel between ASA and router. How to Configure GRE Tunnel IP Source and Destination VRF Membership Follow these steps to configure GRE Tunnel IP Source and Destination VRF Membership: SUMMARY STEPS enable configure terminal interface tunnel number ip vrf forwarding vrf-name ip address ip-address subnet-mask tunnel source { ip-address | type number } and again thanks for this config as it helped :). Therefore, R2 will be able to reach R1 via 30.30.30.3 public IP. Release 7.3.1. I understood the concept very well. In this article, we will configure the GRE (Generic Routing Encapsulation) tunnel between two Cisco Routers. To set the transmit bandwidth used by the tunnel interface, use the tunnel bandwidth command in interface configuration mode. The GRE tunnel will be running between the two Tunnel Interfaces (10.0.0.1 and 10.0.0.2 as shown from diagram). Use the Cisco IOS command line interface (CLI) to access your routers global configuration command mode. This blog is NOT affiliated or endorsed by Cisco Systems Inc. All product names, logos and artwork are copyrights/trademarks of their respective owners. After it is done, we will proceed with the configuration. This is a diagram of the basic overlay network topology used in this example: Every spoke is assigned from a pool of addresses of /112, but receives a /128 address. It is always recommended to provide a different subnet for both the peer ends. In this article, well take you through the steps to configure a GRE tunnel on a Cisco router. What is Network Tunneling and how to configure GRE? Learn how your comment data is processed. duplex auto When configuring GRE, a virtual Layer3 Tunnel Interface must be created. 5 0 obj We previously wrote about how to set up a generic routing encapsulation (GRE) tunnel for Incapsula IP Protection on an Ubuntu AWS Client. GRE tunnels are typically used to establish a VPN between the Cisco router and a remote device that. Did you enjoyed this article? Situation: "Network A" consists of a standard LAN using a Class-C public address. One of the routers is located behind a Cisco ASA 5500 Firewall, so I will show you also how to pass GRE traffic through a Cisco ASA as well. This feature allows you to configure the source and destination of a tunnel to belong to any Virtual Private Network (VPN) routing and forwarding (VRF) table. %PDF-1.5 The static NAT rule will translate 20.20.20.1 (R1 outside IP) to an outside public IP, lets say 30.30.30.3. R1 (config-if)#ip mtu 1400. Please use Cisco.com login. I would suggest using GRE with IPSEC protection between the routers instead of terminating a different IPSEC tunnel on the ASA. Generic Routing Encapsulation (GRE) is a tunneling protocol that provides a simple generic approach to transport packets of one protocol over another protocol by means of encapsulation. Building configuration. If your configuration is perfect, you will receive the ping response messages. 255.255.255. OSPF VRF Configuration . However, it can also be configured over IPSec VPN to perform encryption. 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. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. By submitting this form, you agree that the information you provide will be transferred to Elastic Email for processing in accordance with their Configuring GRE Tunnel Interface on Router R1: interface Tunnel100. Customers Also Viewed These Support Documents, Glimpse of "EIGRP name mode configuration", Understanding Wireless Client Authentication. This blog entails my own thoughts and ideas, which may not represent the thoughts of Cisco Systems Inc. endobj This feature supports: We are trying to create a redundant VPN configuration.. - We have one Active/Active VPN Gateway in Azure with two public IPs and BGP enabled - We have two FortiGate Firewalls.. indusind net banking. endstream With GRE, a virtual tunnel is created between the two endpoints (Cisco routers) and packets . nameif outside tunnel destination 50.50.50.1 So you would configure a VPN ACL on R2 and ASA which will allow GRE traffic to pass inside the IPSEC tunnel. Hear from those who trust us for comprehensive digital security. See http://www.cisco.com/en/US/tech/tk827/tk369/technologies_white_paper09186a00800d6979.shtml for the complete discussion. Now, we will configure the GRE tunnel interface. If you are facing any issue during GRE Tunnel configuration, please leave a comment in comment box! endobj Use a Cisco device which works properly with Multicast. name can be any value, but must be the same in all instances. R1 (config-if)#ip address 10.10.10.1 255.255.255.252. However, we need to initiate the traffic towards the remote networks to make the tunnel up and run. ip address 10.0.0.2 255.255.255.0 I fixed it. The following are some of the limitations pertaining to GRE tunneling on Cisco IOS XE Release Denali 16.3.1: Hardware -switching of the packets occur s when GRE is configured R1 (config)#interface tunnel 0. Lastly, we define the Tunnel Destination IP address. OSPF Metric Propagation. Enter the following commands to create an access list that will match traffic from the Incapsula Protected IP to any destination. 172.16.1.2 R2 (config)# ip route 192.168.1. GRE tunnel uses a tunnel interface a logical interface configured on the router with an IP address where packets are encapsulated and decapsulate as they enter or exit the GRE tunnel. Your email address will not be published. Generic Routing Encapsulation (GRE) is a tunneling protocol that provides a simple generic approach to transport packets of one protocol over another protocol by means of encapsulation. Hub-and-Spoke . interface FastEthernet1/0 !Now tell the router that remote subnet of LAN2 can be reached via the GRE endpoint 10.0.0.2, ip route 192.168.2.0 255.255.255.0 10.0.0.2. interface FastEthernet0/0 Please note also that I have not configured any security protection on the GRE tunnel. You can choose tunnel interface between 0-2147483647 depends on your router capacity. We will be using the following network diagram: As shown from the diagram above, we have two remote sites (LAN1 and LAN2) which we need to connect through the Internet via a GRE tunnel. The GRE tunnel will be terminated between routers R1 and R2. <>/XObject<>/ColorSpace<>/Font<>>>/MediaBox[0.0 0.0 792.0 612.48]/StructParents 1/Annots 22 0 R/Rotate 0>> ip mtu 1400 Sham Link. With this configuration, you dont need to configure the Incapsula Protected IP on the server itself. Sending 5, 100-byte ICMP Echos to 192.168.1.2, timeout is 2 seconds: Success rate is 100 percent (5/5), round-trip min/avg/max = 24/28/32 ms, R1#show ip interface brief | exclude unass, Serial4/0 1.1.1.1 YES manual up up, Tunnel21 192.168.1.1 YES manual up up, VRF info: (vrf in name/id, vrf out name/id), R1(config-if)#ip address 192.168.40.1 255.255.255.0, R4(config-if)#ip address 192.168.40.2 255.255.255.0, *Feb 11 12:46:27.511: %SYS-5-CONFIG_I: Configured from console by console, Success rate is 100 percent (5/5), round-trip min/avg/max = 16/16/20 ms, Success rate is 100 percent (5/5), round-trip min/avg/max = 8/10/12 ms. Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds: Success rate is 100 percent (5/5), round-trip min/avg/max = 8/15/28 ms. You must be a registered user to add a comment. 2 0 obj 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), How to configure GRE Tunnel Between Palo Alto and Cisco Router, Download GNS3 - Latest Version [2.2.16] of 2022 [Offline Installer], Cisco line vty 0 - 4 Explanation and Configuration | VTY - Virtual Teletype, [Solved] The peer is not responding to phase 1 ISAKMP requests, How to Configure GlobalProtect VPN on Palo Alto Firewall, DORA Process in DHCP - Explained in detail, Switchport Modes | Trunk Port | Access Port, Cisco Packet Tracer 7.3 Free Download (Offline Installers), How to configure IPSec VPN between Palo Alto and FortiGate Firewall, 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]. ip tcp adjust-mss 1360 That completes your configuration. GRE tunnels are not secure (no traffic encryption takes place through GRE (except if you run GRE over IPSEC). In addition to it's transport boundary there is a router inside the network that has a GRE tunnel to "Network B". An Imperva security specialist will contact you shortly. /24 and 172.16.3. 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. (Thats the reason we used IPSec to add an encryption layer and secure the GRE tunnel with the help of IPSec we get army-level encryption). Basic interface configuration Then configure GRE Tunnel In the first two commands ("interface tunnel " and "ip address "), we enter interface tunnel mode and configure IP addresses of the GRE tunnel interfaces in the same subnet (12.12.12./30) so that we don't have to specific any routing protocol for routing between them. A VRF table stores routing data for each VPN. ! From the Create Template drop-down, select From Feature Template. From this point, you can ping the server and start seeing traffic routed through Incapsula. The ACL created above is for ASA version 8.3 and later. Generic Routing Encapsulation (GRE) is a networktunnelingprotocol developed by Cisco Systems that can encapsulate a wide variety of network layer protocols inside virtual point-to-point links or point-to-multipoint links over an Internet Protocol network. Thanks Harris for sharing the idea of creating a GRE tunnel from a device behind ASA. How to configuring GRE Tunnel instead of virtual link.? GNS3Network.com is not associated with any profit or non profit organization. By default, GRE does not perform any kind of encryption. speed auto All tunnel interfaces of participated routers must always be configured with an IP address that is not used anywhere else in the network. configure point-to-point tunnels between router 1 to 3 and router 1 to router 4. <>stream It's almost exactly per OCG p.54. R1 (config)# ip route 192.168.2. GRE encapsulates a payload, that is, an inner packet that should be delivered to a destination network inside an outer IP packet. c]:tS=`6"9hE01B-X1F:[/nytN@B(!K&a&- O1 Home>Blog>Setting up a GRE Tunnel on a Cisco Router. Navigate to the Template Screen and Name the Template In vManage NMS, select the Configuration Templates screen. R1#configure terminal. Get the tools, resources and research you need. It is important to allow the tunnel protocol through a firewall and to allow it to pass access control list (ACL) checking. ip address 20.20.20.2 255.255.255.0 I know you have to adjust it for MPLS networks so I thought would be required here as well. Autonomous System Override. In todays environment, we definitely do not want to create a GRE tunnel directly between two devices using public IP addresses. Testing the Configuration of IPSec Tunnel . ! However, GRE tunnels are useful in cases where we need to pass non-unicast traffic between two remote sites (e.g through the Internet). GRE tunnel is a kind of VPN which can provide the connectivity between two remote locations. So, open the router's global configuration mode and run the following commands in global configuration mode. Note that the tunnel destination is the mapped (static NAT) IP address of router R1 (30.30.30.3). Although, you can configure the GRE Tunnel over the IPSec VPN for securing the GRE tunnel. GRE TUNNEL Consider the following topology GRE is fully supported on Cisco routers and as I have said above, its better to protect the GRE tunnel with an IPSEC tunnel for security purposes. This set up works with IPSEC over GRE? EIGRP. GRE is initially defined in rfc1701. ip address 30.30.30.2 255.255.255.0 Configurable tunnel destination IPv4/IPv6 address. *8LoD55vc ez#N+_F #g*-*UH*8#];W>sqz",+P5Aeu->ANgW,~W%jQqOc)M]vlOB%bHsl Just, go to router global configuration mode and run the following command. The ACL below is for ASA 8.3 and later. Enter the following commands on your Cisco router to establish policy-based routing. EIGRP Packet Types / Messages Types and Neighborship Parameters. With this configuration, traffic directed to your network through the GRE interface must return through the same interface. You can verify it by pinging, Configure a static route on your router device (this will direct traffic toward it). In this example, Im taking 10.10.10.0/30 network. On your router, configure network address translation from the Incapsula Protected IP to your current server IP.

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