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. <>/XObject<>/ColorSpace<>/Font<>>>/MediaBox[0.0 0.0 792.0 612.48]/StructParents 1/Annots 22 0 R/Rotate 0>> So, configuring the GRE tunnel by checking the connectivity between routers. EIGRP. 1 0 obj All routing currently used on "Network A" is static. By default, GRE does not perform any kind of encryption. However, it can also be configured over IPSec VPN to perform encryption. Use network address translation (NAT) to translate the Incapsula Protected IP to the current IP address of your server. So lets configure the Network Interfaces on Router R1. Please note that if you configured NAT, you should use the current server IP address in the above configuration, instead of Incapsula Protected IP. Please use Cisco.com login. Required fields are marked *. To restore the default setting, use the no form of this command. Your email address will not be published. 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 } Let's see if both routers can reach each other: Branch#ping 192.168.13.1 Type escape sequence to abort. _f%t&j9)PJ31xS1OE$E:V MR*0ClJ-nL3h'Kz{,>f? Your email address will not be published.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. Each tunnel interface is assigned an IP address within the same network as other Tunnel interfaces. It also supports encapsulating IPv4 broadcast and multicast traffic. 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. EIGRP PE-CE with Backdoor Links. 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. Static routing sends traffic from the Incapsula Protected IP to a fixed address for your server. host 20.20.20.1 tunnel source 20.20.20.1 next-hop-IP is the address used to reach the server, which is usually among the IPs configured on your server NIC interface. If your configuration is perfect, you will receive the ping response messages. BGP Extended Communities for OSPF. 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. You can choose tunnel interface between 0-2147483647 depends on your router capacity. access-list OUT-IN extended permit gre host 50.50.50.1 host 20.20.20.1 When configuring GRE, a virtual Layer3 " Tunnel Interface " must be created. Mobile nodes access the Internet over Wi-Fi access points (APs). ip address 10.0.0.2 255.255.255.0 document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Above you can see that the tunnel interface is up/up on both routers. This blog entails my own thoughts and ideas, which may not represent the thoughts of Cisco Systems Inc. On your router, configure network address translation from the Incapsula Protected IP to your current server IP. nameif inside We will create a GRE tunnel between the HQ and Branch router and ensure that the 172.16.1. So you would configure a VPN ACL on R2 and ASA which will allow GRE traffic to pass inside the IPSEC tunnel. Comparison of Static vs Dynamic Routing in TCP/IP Networks, Cisco OSPF DR-BDR Election in Broadcast Networks Configuration Example, How to Configure Port Forwarding on Cisco Router (With Examples), Adjusting MSS and MTU on Cisco 800 routers for PPPoE over DSL, The Most Important Cisco Show Commands You Must Know (Cheat Sheet), http://www.cisco.com/en/US/tech/tk827/tk369/technologies_white_paper09186a00800d6979.shtml. ip mtu 1400 Unfortunately Cisco ASA does not support GRE tunnel terminated on the device itself. Setting up a GRE Tunnel on a Cisco Router. interface FastEthernet1/0 =Kc!nJ:qKc' B'9l_Lm&f#j}d`!zo/M2W7H8-new}w#nk]vavYJt|KN4hQIVT`LN6e`O4!TZ$22et3!xIDJ/f9)#mV\#`0$cO(9#]eHo6i`EP{664&bCSy0)Z~ r;I65\h$HsB'597zrag&&&j $OElr+&CM[sJad6$G)f}Y}htok^*rQ7QirNw1T+yl5nge?.zx!9}Fq |I$14B)ck=m\/`5|J"P%_u1clG}tl?XIi FpRIxm9 xN2mi CU hM+IhR `0Kn3Sw+n& cjppOW%:Vh|+k3>hP!9 $H [[mx0$4AVNvh^==u1/7r7">Y_kz=\i$OVSM9)#X4)xO1bvw..j)>=zs3cK*g1CJ@#ffP5O&s S9S4[8T;KWNWT! Although, you can configure the GRE Tunnel over the IPSec VPN for securing the GRE tunnel. c]:tS=`6"9hE01B-X1F:[/nytN@B(!K&a&- O1 !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. Choose one of the following for the corresponding steps: 2. 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. 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. ip address 50.50.50.1 255.255.255.0 The router sets the IP MTU internally to 1476 to prevent oversizing anyway. In addition to it's transport boundary there is a router inside the network that has a GRE tunnel to "Network B". Thank you. Here's my configuration. Generic Routing Encapsulation (GRE) is a network tunneling protocol 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. Hear from those who trust us for comprehensive digital security. 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. GRE tunnel is an encapsulation protocol and does not perform any encryption. Please note when you are configuring youll need to replace the text in bold with the requisite addresses you received. How would the configuration look if you had an IPSec Tunnel between R2 and the ASA as well as the GRE between R2 and R1? However, we need to initiate the traffic towards the remote networks to make the tunnel up and run. 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. endobj (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). Before you establish the GRE, note the example screenshot below that shows you the five IPs youll be working with. You would have two different tunnels, one for GRE (just like the one we describe here) plus the IPSEC tunnel. interface Tunnel0 assign IP addresses respectively to their interfaces as per the topology. Go to the global configuration mode and enter the following commands: Now, lets configure the Router Interfaces of Router R2. R1 and R2 can communicate using their Public IP addresses. 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. Then finally I advertised my R1 and R5 loopbacks into OSPF. This is because from ASA version 8.3 and later, any access-list statement must reference a Real IP address and not a Mapped IP address. In this section we are going to configure GRE Tunnel instead of virtual link and also we will configure redistribution to get external routes, #cisco #ciscogateway #cisconetworking #ciscosecure #ciscosecurity #ciscocertification #ciscopartners #ciscocert #ccna #ccnacertification #ccnatraining # . Fill out the form and our experts will be in touch shortly to book your personal demo. Get the tools, resources, and research you need. You will need to allow IPSEC protocols through the ASA outside ACL (ESP, AH, UDP 500). In this article, we will configure the GRE (Generic Routing Encapsulation) tunnel between two Cisco Routers. ip address 192.168.1.1 255.255.255.0 GRE Tunnel Configuration In Router 0, we will create the Tunnel interface and then give this interface an IP Address. Symptoms While establish connection to Juniper GRE tunnel is up but no OSPF announce are transmitted with multicast. GRE is developed by Cisco System. Enter the following commands to apply the policy route to the LAN interface, where the server is connected. As shown, router R1 is behind a Cisco ASA firewall. ! 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. OSPF VRF Configuration . Incapsula will provide you three IPs labeled Incapsula Public IP, Customer Private IP and Incapsula Private IP that will be used, together with the Customer Public IP to configure the GRE. There are two ways to configure NAT translation: Full network address translation of the entire address, and port address translation (PAT) of specific ports. eBGP. Thanks Harris for sharing the idea of creating a GRE tunnel from a device behind ASA. 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. In todays environment, we definitely do not want to create a GRE tunnel directly between two devices using public IP addresses. This blog is very informative. Therefore, IP routing reachability must be in place between 20.20.20.1 and 50.50.50.1. ! tunnel bandwidth {receive | transmit} bandwidth no tunnel bandwidth Syntax Description receive Configure security policies. The information in this document was created from the devices in a specific lab environment. 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). GRE Tunnel. In order to configure the GRE tunnel, two remote locations must be reachable through a static Public IP. Navigate to the Template Screen and Name the Template In vManage NMS, select the Configuration Templates screen. The ACL below is for ASA 8.3 and later. Configuring GRE Tunnels Single Pass GRE Encapsulation Allowing Line Rate Encapsulation Uses of GRE This set up works with IPSEC over GRE? That completes your configuration. This blog is NOT affiliated or endorsed by Cisco Systems Inc. All product names, logos and artwork are copyrights/trademarks of their respective owners. /24 and 172.16.3. The GRE tunnel is special use case for a few users to connect to "Network B" for one purpose. Down Bit and Domain Tag. external bgp ( e bgp) operates in between the multiple autonomous systems bgp features bgp is an open standard protocol exterior gateway protocol designed for inter-as domain routing to scale huge. endobj From the Device Model drop-down, select the type of device for which you are creating the template. You can verify it by pinging, Configure a static route on your router device (this will direct traffic toward it). 4 0 obj Generic Routing Encapsulation Tunnel IP Source and Destination VRF Membership Cisco IOS 16.6.1 The Generic Routing Encapsulation Tunnel IP . The first step is to configure your firewall device with the appropriate tunnel interfaces. My ping is not working from inside to out or out to in. 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. interface Tunnel0 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 The ICMP message will alert the sender that the MTU is 1476.. 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. ip tcp adjust-mss 1360 Interface and Hardware Component Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 7.5.x Configuring GRE Tunnels Contents. i followed his video and try to configure the GRE tunneling on R1 and R3 however i managed to bring up the interface tunnel 0 up the interface but after i finish the ip address. I believe you can, although I havent tested it. It's almost exactly per OCG p.54. Note that we reduce the MTU size in order to accommodate the extra headers added from the GRE protocol. 2 0 obj There was some error in config :). <>stream dbE}WK?L~Y jo^4WE9{QS"Qv+*7bw61~w@f3Ivg)J:? VR,$"-[;4>qR|GG]A2mS}x\/]:y{tlaW.r>1O)x=@7Ik >g}wZWc#O-1+?X+Diz/W!} |}ZB Y7NA Wl 6& security-level 100 If you have any questions, please let leave me acomment. nat (inside,outside) static 30.30.30.3. 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. The GRE tunnel will be terminated between routers R1 and R2. After configuring the following, the GRE tunnel should be up. interface FastEthernet1/0 Also, the Tunnel Interfaces will be using as actual source IPs the addresses of the outside router interfaces (20.20.20.1 for R1 and 50.50.50.1 for R2). Lets see the configuration, starting with the routers first: interface FastEthernet0/0 Instead of, we can create a site to site VPN tunnel as you mentioned in the discussion between R2 and ASA and allow the traffic only between the two loopback interfaces create on R1 and R2. Along with the IP address, you also need to configure local and remote public IP addresses as well. OSPF Network Design. If you want you can configure IPSEC on top of GRE in order to encrypt all data passing through the GRE tunnel. EIGRP Packet Types / Messages Types and Neighborship Parameters. By using the loopback inerfaces as the GRE tunnel end point, it can simplify the tunnel configuration and accomplish tasks without jeopardize network security. Access the CLI of any of the router and initiate a ping to the GRE LAN Subnet. Required fields are marked *. name can be any value, but must be the same in all instances. Nice blog. ip address 20.20.20.1 255.255.255.0 Now, we have finished the configuration between both the GRE Neighbors. Find answers to your questions by entering keywords or phrases in the Search bar above. Please note also that I have not configured any security protection on the GRE tunnel. Over the years he has acquired several professional certifications such as CCNA, CCNP, CEH, ECSA etc. R1 (config-if)#ip mtu 1400. 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(?&. Please can I config a GRE tunnel between ASA (5512-x) and a remote cisco router for Multicast traffic? Internet Access. Copyright 2022 | Privacy Policy | Terms and Conditions | Hire Me | Contact | Amazon Disclaimer | Delivery Policy. Enter the following commands on your Cisco router to establish policy-based routing. It is always recommended to provide a different subnet for both the peer ends. speed auto First of all, we need to configure the Network Interfaces on both of the Routers. 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. Get the tools, resources and research you need. Let's start with the configuration of the interfaces: You need to have two routers. and again thanks for this config as it helped :). 172.16.1.2 R2 (config)# ip route 192.168.1. R1 (config-if)#ip address 10.10.10.1 255.255.255.252. tunnel destination 50.50.50.1 speed auto. In the Device tab, click Create Template. You can also configure Dynamic Routing Protocols between GRE Peers. By default, GRE does not perform any kind of encryption. Now, we will configure the GRE tunnel interface. With this configuration, traffic directed to your network through the GRE interface must return through the same interface. This feature introduces the tunnel ttl disable command. Generic Routing Encapsulation (GRE), is a simple IP packet encapsulation protocol. Yes it will work with IPSEC over GRE as well. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. If you've already registered, sign in. GRE is initially defined in rfc1701. duplex auto R1#ping 192.168.2.1 source 192.168.1.1. Router R1 has Public IP 101.1.1.1 and Router R2 has Public IP 102.1.1.1. It is a myth you have to adjust the MTU on the Tunnel interface. I would suggest using GRE with IPSEC protection between the routers instead of terminating a different IPSEC tunnel on the ASA. GRE is used when packets need to be sent from one network to another over the internet. 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. \fX-4kHt fZ+DmF#W!J!a+ Home>Blog>Setting up a GRE Tunnel on a Cisco Router. Building configuration. Edgar#srint tun1 Building configuration. Now if you ping a host to LAN2 from LAN1 (and vica-versa) you should get ICMP replies. When configuring GRE, a virtual Layer3 Tunnel Interface must be created. speed auto, !Now configure GRE Tunnel Interface. One platform that meets your industrys unique security needs. Autonomous System Override. GRE tunnel is a kind of VPN which can provide the connectivity between two remote locations. ,\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 Use a Cisco device which works properly with Multicast. So, lets configure the GRE Tunnel. Find the right plan for you and your organization. % 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. I have setup a capture on outside for gre and icmp. Generic Routing Encapsulation (GRE) has some disadvantages:-. 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. And its very interesting topic. Made sure R1 tunnel destination match with R5 tunnel source and vice versa. The default tunneling mode is GRE. Method Status Protocol, FastEthernet0/0 10.1.1.1 YES manual up up, Serial4/0 1.1.1.1 YES manual up up, FastEthernet0/0 20.1.1.1 YES manual up up, Serial4/0 1.1.1.2 YES manual up up, Serial4/1 3.3.3.1 YES manual up up, Serial4/2 4.4.4.1 YES manual up up, FastEthernet0/0 30.1.1.1 YES manual up up, Serial4/1 3.3.3.2 YES manual up up, FastEthernet0/0 40.1.1.1 YES manual up up, Serial4/2 4.4.4.2 YES manual up up, R1(config)#ip route 0.0.0.0 0.0.0.0 serial 4/0, R2(config)#ip route 1.0.0.0 255.0.0.0 serial 4/0, R2(config)#ip route 10.0.0.0 255.0.0.0 serial 4/0, R2(config)#ip route 30.0.0.0 255.0.0.0 serial 4/1, R2(config)#ip route 3.0.0.0 255.0.0.0 serial 4/1, R2(config)#ip route 4.0.0.0 255.0.0.0 serial 4/2, R2(config)#ip route 40.0.0.0 255.0.0.0 serial 4/2, R3(config)#ip route 0.0.0.0 0.0.0.0 serial 4/1, R4(config)#ip route 0.0.0.0 0.0.0.0 serial 4/2. Current configuration : 154 bytes ! name2 is the name of an access list to use for matching traffic sourced by the server and forwarded via the tunnel. Configurable tunnel source using interface. So, open the routers global configuration mode and run the following commands in global configuration mode. Protect your business for 30 days on Imperva. !Allow GRE traffic from R2 to R1. Before you configure you must adjust (MTU) maximum transfer unit and MSS maximum segment size. Privacy Policy. IS-IS. tunnel destination 30.30.30.3 New here? Even the latest generation of ASA 5500-X series with the latest version of 9.x does not support termination of GRE on an ASA interface. 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. 5 0 obj ip address 30.30.30.2 255.255.255.0 All trademarks are the property of their respective owners. For example, in Mobile IP, a mobile node registers with a Home Agent. The static NAT rule will translate 20.20.20.1 (R1 outside IP) to an outside public IP, lets say 30.30.30.3. In order to configure the GRE tunnel, you must need connectivity between two remote routers through static Public IP address. Both routers are connected to "the Internet" using the ISP router. ! Also, the Tunnel Interfaces will be using as actual source IPs the addresses of the outside router interfaces (20.20.20.1 for R1 and 50.50.50.1 for R2). . A VRF table stores routing data for each VPN. Learn how your comment data is processed. So, just initiate the traffic towards the remote subnet. ip address 192.168.2.1 255.255.255.0

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