speed auto. 2 0 obj You will need to allow IPSEC protocols through the ASA outside ACL (ESP, AH, UDP 500). duplex auto Thank you. First step is to create our tunnel interface on R1 and R2 : R1R2 Since GRE is an encapsulating protocol, we adjust the maximum transfer unit (mtu) to 1400 bytes and maximum segment size (mss) to 1360 bytes. New here? You can also configure Dynamic Routing Protocols between GRE Peers. Above you can see that the tunnel interface is up/up on both routers. It is unnecessary. Configuration . R1 (config-if)#ip mtu 1400. Find the right plan for you and your organization. Required fields are marked *. From this point, you can ping the server and start seeing traffic routed through Incapsula. Router R1 has Public IP 101.1.1.1 and Router R2 has Public IP 102.1.1.1. Before you establish the GRE, note the example screenshot below that shows you the five IPs youll be working with. Then, make sure to specify which interfaces on the router are internal and which are external. For the official GNS3 website, visit gns3.com. endstream and again thanks for this config as it helped :). Navigate to the Template Screen and Name the Template In vManage NMS, select the Configuration Templates screen. However, GRE tunnels are useful in cases where we need to pass non-unicast traffic between two remote sites (e.g through the Internet). With this configuration, you dont need to configure the Incapsula Protected IP on the server itself. It was developed by Cisco but later became an industry standard (RFC 1701, RFC 2784, and RFC 2890). We will create a GRE tunnel between the HQ and Branch router and ensure that the 172.16.1. Change my R1 and R5 loopsbacks into different networks (R1 Loopback 192.168.10.10) and (R5 Loopback 192.168.20.20). So, just initiate the traffic towards the remote subnet. My ping is not working from inside to out or out to in. This is exactly what makes this scenario a little bit different from others. Mobile nodes access the Internet over Wi-Fi access points (APs). 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. GRE allows routing of IP packets between private IPv4 networks which are segregated over public IPv4 Internet. By default, GRE does not perform any kind of encryption. Just open the console of nay router and ping another end router. Remember to replace bold items with actual values. tunnel source 20.20.20.1 Yes it will work with IPSEC over GRE as well. Release 7.3.1. Get the tools, resources, and research you need. Lets see the configuration, starting with the routers first: interface FastEthernet0/0 As an Amazon Associate I earn from qualifying purchases. ip address 20.20.20.1 255.255.255.0 The GRE tunnel is special use case for a few users to connect to "Network B" for one purpose. By default, GRE does not perform any kind of encryption. This capability is now extended to the Cisco 8000 Series Routers. You can verify it by pinging, Configure a static route on your router device (this will direct traffic toward it). You would have two different tunnels, one for GRE (just like the one we describe here) plus the IPSEC tunnel. It is a myth you have to adjust the MTU on the Tunnel interface. 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. ip address 30.30.30.2 255.255.255.0 Did you enjoyed this article? interface Tunnel0 With this configuration, traffic directed to your network through the GRE interface must return through the same interface. From the Device Model drop-down, select the type of device for which you are creating the template. It must be the same in all instances. Note that we reduce the MTU size in order to accommodate the extra headers added from the GRE protocol. %PDF-1.5 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. If your configuration is perfect, you will receive the ping response messages. We have done the configuration on both the Cisco Routers . Before you configure you must adjust (MTU) maximum transfer unit and MSS maximum segment size. In this configuration tutorial I will show you how to configure a GRE tunnel between two Cisco IOS routers. So lets configure the Network Interfaces on Router R1. Otherwise, register and sign in. 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 . 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. configure the topology as per the diagram. tunnel destination 50.50.50.1 Interface and Hardware Component Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 7.5.x Configuring GRE Tunnels Contents. 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. Since R2 must be able to reach R1, the only way to expose R1 to the outside world is by creating a static NAT on the ASA firewall. It's almost exactly per OCG p.54. Pre-Bestpath POI. In this example, Im taking 10.10.10.0/30 network. The routes next hop needs to point to an IP configured on your server. 3. Edgar#srint tun1 Building configuration. R1 (config)# ip route 192.168.2. I am doing similar lab in GNS3. 97y$`%'_k>=Rh6Vl_Di$vzq=%T4xpl("S{MI9X@j`BowDD1-23h*XK0zx3pt5\tdcMr=5.kFjBYxZtYa(Gv@KAa)GiS!QIWW]1; We will use another subnet 10.10.10.0/30 which is used for GRE tunnel interfaces. Customers Also Viewed These Support Documents, Glimpse of "EIGRP name mode configuration", Understanding Wireless Client Authentication. tunnel destination 30.30.30.3 After it is done, we will proceed with the configuration. 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. Uses of GRE Hear from those who trust us for comprehensive digital security. endobj 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. Here, you can get Network and Network Security related Articles and Labs. 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. Building configuration. The ACL below is for ASA 8.3 and later. I would suggest using GRE with IPSEC protection between the routers instead of terminating a different IPSEC tunnel on the ASA. EIGRP Packet Types / Messages Types and Neighborship Parameters. Thanks a lot for stopping by and leaving your comment. The ACL created above is for ASA version 8.3 and later. OSPF VRF Configuration . In order to configure the GRE tunnel, two remote locations must be reachable through a static Public IP. Along with the IP address, you also need to configure local and remote public IP addresses as well. interface GigabitEthernet1 This module . Two scenarios that come to my mind now include passing routing protocols (such as OSPF) between two remote sites, and also passing multicast traffic through the GRE tunnel from one site to another. 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. R1#ping 192.168.2.1 source 192.168.1.1. Comment * document.getElementById("comment").setAttribute( "id", "a0bb3bff2a491a9aa278c1504437ddb6" );document.getElementById("d8ef399e04").setAttribute( "id", "comment" ); Notify me of follow-up comments by email. endobj All tunnel interfaces of participated routers must always be configured with an IP address that is not used anywhere else in the network. 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. While GRE doesn't provide encryption, you can enable a key on each side of the tunnel using the. See http://www.cisco.com/en/US/tech/tk827/tk369/technologies_white_paper09186a00800d6979.shtml for the complete discussion. It is important to allow the tunnel protocol through a firewall and to allow it to pass access control list (ACL) checking. ip address 192.168.1.1 255.255.255.0 255.255.255. The first step is to configure your firewall device with the appropriate tunnel interfaces. This module provides information about how to configure a GRE tunnel. Route outside 0.0.0.0 0.0.0.0 30.30.30.30, !Create a static NAT which translates 20.20.20.1 to 30.30.30.3, object network router_static I fixed it. GRE usages IP protocol number 47. We previously wrote about how to set up a generic routing encapsulation (GRE) tunnel for Incapsula IP Protection on an Ubuntu AWS Client. If you've already registered, sign in. assign IP addresses respectively to their interfaces as per the topology. 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. <> Get the tools, resources and research you need. [If] the DF bit is set, and the datagram size (1500 bytes) is greater than the GRE tunnel IP MTU (1476), the router will drop the datagram and send an ICMP fragmentation needed but DF bit set message to the source of the datagram. 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. access-group OUT-IN in interface outside. Terms of Use and So, open the routers global configuration mode and run the following commands in global configuration mode. However, why would you want to do that? Both routers are connected to "the Internet" using the ISP router. It can tunnel any layer 3 protocol including IP. !Allow GRE traffic from R2 to R1. After that, we we will define the Tunnel Source, with IP Address or with Interface name. 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. A VRF table stores routing data for each VPN. And its very interesting topic. When we use GRE? duplex auto speed auto, !Now configure GRE Tunnel Interface. 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. Required fields are marked *. . Copyright 2022 | Privacy Policy | Terms and Conditions | Hire Me | Contact | Amazon Disclaimer | Delivery Policy. However, we need to initiate the traffic towards the remote networks to make the tunnel up and run. 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. It also supports encapsulating IPv4 broadcast and multicast traffic. % m7LU*ua_e%0Yotq=px?vh: F You need to have two routers. I have debug on outside router and when I ping from inside I can see that traffic arrives on outside routere. R1 (config-if)#ip address 10.10.10.1 255.255.255.252. This effectively exposes the GRE IP Header as it is not encrypted the same way it is in Tunnel mode. 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. 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 addition to it's transport boundary there is a router inside the network that has a GRE tunnel to "Network B". 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. Each tunnel interface is assigned an IP address within the same network as other Tunnel interfaces. duplex auto ip mtu 1400 Generic Routing Encapsulation (GRE) provides a simple approach to transporting packets of one protocol over another protocol using encapsulation. 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. The static NAT rule will translate 20.20.20.1 (R1 outside IP) to an outside public IP, lets say 30.30.30.3. 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.

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