It is a myth you have to adjust the MTU on the Tunnel interface. How to configuring GRE Tunnel instead of virtual link.? Learn how your comment data is processed. As we have seen above, the ASA can allow GRE traffic to pass through it but the tunnel cant be terminated on the ASA itself. I know you have to adjust it for MPLS networks so I thought would be required here as well. I would suggest using GRE with IPSEC protection between the routers instead of terminating a different IPSEC tunnel on the ASA. So you would configure a VPN ACL on R2 and ASA which will allow GRE traffic to pass inside the IPSEC tunnel. Over the years he has acquired several professional certifications such as CCNA, CCNP, CEH, ECSA etc. I have two different routers in two different locations. 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. And its very interesting topic. In this article, we configured the GRE tunnel on Cisco Routers. 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. OSPF VRF Configuration . GRE TUNNEL Consider the following topology Imperva prevented 10,000 attacks in the first 4 hours of Black Friday weekend with no latency to our online customers., Ensure consistent application performance, Secure business continuity in the event of an outage, Ensure consistent application availability, Imperva Product and Service Certifications, Microsoft Exchange Server Vulnerabilities CVE-2022-41040 and CVE-2022-41082, How Scanning Your Projects for Security Issues Can Lead to Remote Code Execution, Record 25.3 Billion Request Multiplexing DDoS Attack Mitigated by Imperva, The Global DDoS Threat Landscape - September 2022, Imperva Boosts Connectivity with New PoP in Manila. Were including instructions for Cisco routers because they continue to be the most popular brand of enterprise routers and network switches. ip mtu 1400 An Imperva security specialist will contact you shortly. 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. Generic Routing Encapsulation (GRE) provides a simple approach to transporting packets of one protocol over another protocol using encapsulation. It also supports encapsulating IPv4 broadcast and multicast traffic. As you might know already, GRE tunnel termination is not supported on Cisco ASA firewalls. !Now tell the router that remote subnet of LAN1 can be reached via the GRE endpoint 10.0.0.1, ip route 192.168.1.0 255.255.255.0 10.0.0.1. On your router, configure network address translation from the Incapsula Protected IP to your current server IP. Made sure R1 tunnel destination match with R5 tunnel source and vice versa. A lot of people keep asking if the ASA supports termination of GRE tunnel on the firewall device itself. 5 0 obj Enter the following commands to apply the policy route to the LAN interface, where the server is connected. security-level 0 You can not configure a GRE tunnel between ASA and router. Therefore, R2 will be able to reach R1 via 30.30.30.3 public IP. Now, we have finished the configuration between both the GRE Neighbors. ip address 192.168.2.1 255.255.255.0 Unfortunately Cisco ASA does not support GRE tunnel terminated on the device itself. ! 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. interface FastEthernet1/0 <> 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(?&. interface FastEthernet1/0 Then, make sure to specify which interfaces on the router are internal and which are external. <>/XObject<>/ColorSpace<>/Font<>>>/MediaBox[0.0 0.0 792.0 612.48]/StructParents 1/Annots 22 0 R/Rotate 0>> Thats it for the routers. There are two ways to configure NAT translation: Full network address translation of the entire address, and port address translation (PAT) of specific ports. The IPsec you mentioned above is for different scanrio. You need to have two routers. More Details: Here is a sample config for GRE. Access the CLI of any of the router and initiate a ping to the GRE LAN Subnet. GRE tunnel is a kind of VPN which can provide the connectivity between two remote locations. Sending 5, 100-byte ICMP Echos to 20.1.1.1, timeout is 2 seconds: Success rate is 100 percent (5/5), round-trip min/avg/max = 16/33/60 ms. Sending 5, 100-byte ICMP Echos to 30.1.1.1, timeout is 2 seconds: Success rate is 100 percent (5/5), round-trip min/avg/max = 16/38/68 ms. Sending 5, 100-byte ICMP Echos to 40.1.1.1, timeout is 2 seconds: Success rate is 100 percent (5/5), round-trip min/avg/max = 16/23/36 ms, R1(config-if)#ip address 192.168.1.1 255.255.255.0, R3(config-if)#ip address 192.168.1.2 255.255.255.0, R3(config-router)#no auto-summary cy. Internet Router A Router B Server A Host 1 IPv4 or IPv6 private network Server B Host 2 The ICMP message will alert the sender that the MTU is 1476.. endobj It can tunnel any layer 3 protocol including IP. However, GRE tunnels are useful in cases where we need to pass non-unicast traffic between two remote sites (e.g through the Internet). After it is done, we will proceed with the configuration. ip address 30.30.30.2 255.255.255.0 Also, we must configure an access list on the ASA (applied on the outside ASA interface) which must allow GRE traffic from 50.50.50.1 to 20.20.20.1. Protect your business for 30 days on Imperva. 2 0 obj interface Tunnel1 ip address 192.0.1.1 255.255.255.252 ip mtu 1400 ip tcp adjust-mss 1360 tunnel source Loopback10 tunnel destination 4.4.4.4 end Dermott#srint tun1 Building configuration. Now, we will configure the GRE tunnel interface. ! Customers Also Viewed These Support Documents, Glimpse of "EIGRP name mode configuration", Understanding Wireless Client Authentication. ,\G3: (U19$7T.Jmzio?/C~;_!Dlo_+lq=@lPV:#+u.Y1 qH7cp+&vU [E|.3wg5=bb&Oo2]\Q_@4XLLWC [CLhF= {YD"i9( NL*[`eY Hr!w4 %RTDK&*|x=o@=%6`?.f{F6+p{ mT4/5II7;n3r$EO :6q 4#`O=Umb(36id|F/N+^di(Ov}h3Jo9d1Dom:`'dJ|aIR+h8]_=**;82|qqF _f%t&j9)PJ31xS1OE$E:V MR*0ClJ-nL3h'Kz{,>f? 3. ip address 10.0.0.2 255.255.255.0 nat (inside,outside) static 30.30.30.3. The routes next hop needs to point to an IP configured on your server. <>stream You will need to allow IPSEC protocols through the ASA outside ACL (ESP, AH, UDP 500). Let's see if both routers can reach each other: Branch#ping 192.168.13.1 Type escape sequence to abort. The solution to this issue is to configure ip tcp adjust-mss 1436 on the tunnel interface. After it is done, we will proceed with the configuration. BGP Extended Communities for OSPF. This blog is NOT affiliated or endorsed by Cisco Systems Inc. All product names, logos and artwork are copyrights/trademarks of their respective owners. Enter the following commands to create an access list that will match traffic from the Incapsula Protected IP to any destination. Use these resources to familiarize yourself with the community: There is currently an issue with Webex login, we are working to resolve. EIGRP. How to Configure EIGRP on Cisco Routers (With Example), How to Configure Dynamic DDNS on Cisco Routers (DYNDNS). If you are facing any issue during GRE Tunnel configuration, please leave a comment in comment box! Up to 256 GRE connections can be configured, with a single GRE tunnel per VTI when point-to-point GRE is used. Autonomous System Override. 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. By default, GRE does not perform any kind of encryption. Here, we used Interface name. R2 supports IPsec and R1 does not and we need to run BGP to support a diverse route from the Primary WAN connection. There was some error in config :). Please use Cisco.com login. GRE is developed by Cisco System. R1 (config)# ip route 192.168.2. In addition to it's transport boundary there is a router inside the network that has a GRE tunnel to "Network B". R1#configure terminal. Let's start with the configuration of the interfaces: ! When we use GRE? So lets configure the Network Interfaces on Router R1. Generic Routing Encapsulation Tunnel IP Source and Destination VRF Membership Cisco IOS 16.6.1 The Generic Routing Encapsulation Tunnel IP . It's almost exactly per OCG p.54. Uses of GRE Yes it will work with IPSEC over GRE as well. Testing the Configuration of IPSec Tunnel . 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. Enter the following commands on your Cisco router to establish policy-based routing. nameif inside document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. EIGRP PE-CE with Backdoor Links. R1#ping 192.168.2.1 source 192.168.1.1. These RGs or CPE can be configured in bridged mode, and Ethernet over Generic Routing Encapsulation (GRE) tunnels can be used to forward Ethernet traffic to the aggregation device. After that, we we will define the Tunnel Source, with IP Address or with Interface name. Then finally I advertised my R1 and R5 loopbacks into OSPF. The GRE tunnel will be running between the two Tunnel Interfaces (10.0.0.1 and 10.0.0.2 as shown from diagram). In this article, we will configure the GRE (Generic Routing Encapsulation) tunnel between two Cisco Routers. With this configuration, you dont need to configure the Incapsula Protected IP on the server itself. <>stream If you've already registered, sign in. I have debug on outside router and when I ping from inside I can see that traffic arrives on outside routere. Thanks a lot for stopping by and leaving your comment. endstream Your email address will not be published. This capability is now extended to the Cisco 8000 Series Routers. We Provide Technical Tutorials and Configuration Examples about TCP/IP Networks with focus on Cisco Products and Technologies. Required fields are marked *. Find the right plan for you and your organization. Configurable tunnel source using IPv4/IPv6 address. If you have any questions, please let leave me acomment. Resolution Configure ttl for GRE tunnel, set to 64: Put a static Arp entry onto your router/firewall. When we create a GRE point-to-point tunnel without any encryption is extremely risky as sensitive data can easily be extracting from the tunnel and misused by others. IPSec Transport mode is not used by default configuration and must be configured using the following command under the IPSec transform set: R1 (config)# crypto ipsec transform-set TS esp-3des esp-md5-hmac. 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. Choose one of the following for the appropriate steps: In this option you will configure the Incapsula Protected IP on your server itself and ensure traffic is directed toward it. Here, you can get Network and Network Security related Articles and Labs. OSPF Metric Propagation. However, why would you want to do that? We will use another subnet 10.10.10.0/30 which is used for GRE tunnel interfaces. interface Tunnel0 % This module . My ping is not working from inside to out or out to in. It was developed by Cisco but later became an industry standard (RFC 1701, RFC 2784, and RFC 2890). Interface and Hardware Component Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 7.5.x Configuring GRE Tunnels Contents. I wish you have mentioned IPsec for the same scenario because I am not able to implement it. Also, you allow me to send you informational and marketing emails from time-to-time. 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. A VRF table stores routing data for each VPN. Enter your Email below to Download our Free Cisco Commands Cheat Sheets for Routers, Switches and ASA Firewalls. endobj Building configuration. Remember to replace bold items with actual values. Let us see now how to configure the ASA. . Pre-Bestpath POI. The GRE tunnel will be running between the two Tunnel Interfaces (10.0.0.1 and 10.0.0.2 as shown from diagram). 255.255.255. the status become up and the protocol status is down on both R1 and R3, my objective for this GRE is to able to ping from pc ip address 192.168.1./24 to 192.168.3./24 . Sending 5, 100-byte ICMP Echos to 192.168.13.1, timeout is 2 seconds: !!!!! The default tunneling mode is GRE. Note that we reduce the MTU size in order to accommodate the extra headers added from the GRE protocol. I believe you can, although I havent tested it. m7LU*ua_e%0Yotq=px?vh: F Hear from those who trust us for comprehensive digital security. Configuring GRE Tunnel Interface on Router R1: interface Tunnel100. I can see traffic when I ping from inside to outside (Proto 47) but when I ping from outside to inside then I dont see any traffic on CISCO ASA. 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. This feature supports: See http://www.cisco.com/en/US/tech/tk827/tk369/technologies_white_paper09186a00800d6979.shtml for the complete discussion.

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