Informationaboutiptunnels,page1 licensingrequirementsforiptunnels,page2. The downside of gre tunneling is that it is clear text and offers no form of protection. Create a tunnel interface the ip address of tunnel interface on both routers must be in the same subnet, and configure a tunnel source and tunnel destination under tunnel interface configuration. Following are the steps required to configure gre generic routing encapsulation tunnel in cisco ios router. Generic routing encapsulation gre page 5 configuration example figure 4. In the configuration editor, navigate to connections site gre tunnels, and configure routes to forward internet prefix services to the zscaler gre tunnels.
Please be aware the tunnel numbers do not have to match. The source ip address can only be chosen from the virtual network interface on trusted links. When we issue the interface tunnel command, we create a logical interface on the router and name it appropriately. As the first multi vendor network blog of the world, with. The routers used with ccna handson labs are cisco 1941 integrated services routers isrs with. Were including instructions for cisco routers because they continue to be the most popular brand of enterprise routers and network switches. Download cisco 300 206 senss exam dumps updated practice exam pdf questions. On the cisco router, you can perform the following verification steps to.
Gre tunneling feature guide 20142016 cisco andor its affiliates. Use s000 on west as the tunnel source interface and 10. The routing tables of two routers show that they are directly connected via gre tunnel. These settings are the equivalent of the cisco loopback interface configuration, configure the cisco accordingly. Gre encapsulation supports any osi layer 3 protocol. There are other gre modes like tunnel mode gre multipoint used in. Enabling tunneling, page 74 creating a tunnel interface, page 75 configuring a gre tunnel, page 77 enabling path mtu discovery, page 78. Red font color or gray highlights indicate text that appears in the answer copy only. If you do not want to configure this site as a gre tunnel termination node, you can skip this step, and proceed to the section, configuring the wan links for the mcn site.
In this lesson i will show you how to configure an encrypted gre tunnel. Pdf quick configuration guide configuring a gre over. You will also configure the ospf routing protocol inside the gre vpn 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. Go to router global configuration mode and configure the gre tunnel using the below commands. We can use gre to create tunnels between routers, the tunnels are established with public ip addresses and the ip packets we encapsulate use private ip addresses. In this article, well take you through the steps to configure a gre tunnel on a cisco router. Gre tunneling feature guide catalyst 3850 switches. How to configure a gre tunnel between a cisco 881 isr and zens with a sample. The configuration example in the slide depicts a simple gre tunnel configuration between routers r1 and r2.
What gre tunnels are and how to configure it on cisco routers. Now, we will configure the gre tunnel on cisco router. How to configure gre tunnel in cisco router ip with ease. What does mean sent packet through gre tunnel interface.
Quick configuration guide configuring a gre over ipsec vpn tunnel in aos configuring a gre over ipsec vpn tunnel in aos. Step 8 show runningconfig interface tunnel verifies the configuration. Interface and hardware component configuration guide for cisco ncs 5500 series routers, ios xr release 6. Vpn and tunnel concept with ipinip tunnel configuration. Using generic routing encapsulation gre tunnels on cisco routers can come in handy with cisco router administration, and configuring gre tunnels is.
Contents 6 pointtopoint gre over ipsec design guide ol902301 sizing the branch sites 510 tunnel aggregation and load distribution 511 network layout 511 appendix a scalability test bed configuration files a1 cisco 7200vxr headend configuration a1 cisco catalyst 6500sup2vpnsm headend configuration a2 cisco 7600sup720vpn spa headend configuration p2p gre on sup720 a6. When youre configuring the gre tunnels, the tunnel source must reference the outside interface of the local router, and the tunnel destination must. This document describes how to configure the transport router to establish a gre tunnel connection to a cisco router with ipsec encryption. For our gre tunnel configuration example, we will use the below topology and the given ip addresses. Gre tunnel interface addresses will be in the same subnet. Tunnel destination tunnel mode tunnel source anipv4 anipv4address. This is the ip of the physical interface at the other side. The below example explain about how to create simple gre tunnels between endpoints and the necessary steps to create and verify the gre tunnel between the two networks. Create a tunnel interface and assign an ip address.
Cisco configuring a gre tunnel over ipsec with ospf. How to configure gre tunnel between palo alto and cisco router. Ipip gre eoip l2tp pptp layer3 tunnel layer 3 tunnel layer 2 tunnel layer 2 tunnel layer2 tunnel 4 for ipv4 and 41 for ipv6 ip protocol number 47 ip protocol number 47 1701 udp 1723 tcp. On cisco ios routers however we can use ipsec to encrypt the entire gre tunnel, this allows us to have a safe and secure sitetosite tunnel. Tunnel interface configurationbranch static public ip address 214. In order to configure the gre tunnel, you must need connectivity between two remote routers through static public ip address.
For example, we can encapsulate an ip packet into another ip packet. To configure generic routing encapsulation gre over an ipsec tunnel between two routers, perform these steps. Contents 6 pointtopoint gre over ipsec design guide ol902301 sizing the branch sites 510 tunnel aggregation and load distribution 511 network layout 511 appendix a scalability test bed configuration files a1 cisco 7200vxr headend configuration a1 cisco catalyst 6500sup2vpnsm headend configuration a2 cisco 7600sup720vpn spa headend configuration p2p gre on. Cisco nxos does not support wccp on tunnel interfaces.
This lets us present the basic tunneling configuration yet leaving the more specialized security configuration to another more relevant cisco certification in the security track. Cisco ccna ccnp and linux pdf notes, cisco 200125, cisco ccna 200120, ccnp switch 300115, ccnp route, linux rhel6,rhel7, centos. Follow these steps to configure gre tunnel ip source and destination vrf. Enter the destination, this is not the ip of the tunnel at the other side.
Configuration network interfaces gre tunnel 0 parameter setting description ip address 172. How to configure a gre tunnel page 2 cisco community. When the sending router decides to send a packet into the gre tunnel, it will wrap the whole packet into another ip packet with two headers. Give the tunnel a source most of the time router inbetween the routers you are configuring location x. Support is not available for the fol lowing features in ios xe 16. Because you need to totally crosseliminate crypto acls, you can configure a gre tunnel and encrypt all traffic that traverses the tunnel. The sdwan gre tunnels settings enable you to configure sdwan appliances to terminate gre tunnels on the lan. Configuring gre tunnel through a cisco asa firewall. Generic routing encapsulation gre is a tunneling protocol developed by cisco that allows the encapsulation of a wide variety of network layer protocols inside pointtopoint links a gre tunnel is used when packets need to be sent from one network to another over the internet or an insecure network.
Configuring ip tunnels thischaptercontainsthefollowingsections. Together, we will focus on network lessons, configurations and the network certifications of cisco, nokia, juniper and huawei. Generic routing encapsulation gre is a method to tunnel ip packets between two end points. 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. Configuring gre tunnel through a cisco asa firewall in this configuration tutorial i will show you how to configure a gre tunnel between two cisco ios routers. When your packet has arrived to router where is gre tunnel interface it has to be send through tunnel interface. The goal is that pc1 private network be able to ping pc2 another private network, by going via r3 which represent internet.
Also with this device, is it possible to create gre interfaces. Gretunnel werden in ciscoroutern als virtuelle interfaces konfiguriert. In this article i will also explain how to configure gre tunnels. Zscaler integration by using gre tunnels and ipsec tunnels. Gre generic routing encapsulation is a tunneling protocol that allows us to encapsulate packets into other packets.
In this confgiuration example, we will see how to configure cisco gre generic routing encapsulation tunnel with packet tracer. See below for an example of configuring gre tunnels, with a network diagram for clarity. Configuring generic routing encapsulationgre tunnel ip. So you will want to couple this with some other type of technology to protect your data. Gre is an internet engineering task force ietf standard defined in rfc 2784. Configuring ip tunnels this section includes the following topics. Basic gre tunnels are created using the following steps. What gre tunnels are and how to configure it on cisco. We just want to show you this command and let you know that we are configuring a traditional pointtopoint gre. The next command tunnel mode gre ip is in fact not necessary as this is the default setting. Cisco ccna gre tunnel configuration asm, rockville. Success rate is 100 percent 11, roundtrip minavgmax 888 ms. Bgp over gre tunnel may 5, 2017 in this blog post we are going to explain how generic routing encapsulation gre tunnel might be used in a situation when the border gateway protocol bgp speaking routers are connected via the non bgpspeaking routers.
This section shows the changes the gre tunnel interface configuration. This chapter presents the steps to selecting cisco products for a vpn solution, starting. In this article, we will configure the gre generic routing encapsulation tunnel between two cisco routers. Configuring device a tunnel destination ip address 2. The objective of this lab is to establish a gre tunnel between router1 and router3 and verify it is working by pinging across the tunnel. Configuring pointtopoint gre vpn tunnels unprotected. Configure a gre tunnel in part 2, you will configure a gre tunnel between the west and east routers. With gre, a virtual tunnel is created between the two endpoints cisco routers and packets.
Generic routing encapsulation gre configuration guide. How to configure generic routing encapsulation gre. Gre tunnel configuration ccnp best cisco ccna ccnp and. Topology addressing table device interface ip address subnet mask default gateway ra g00 192. Generic routing encapsulation gre is a tunneling protocol developed by cisco systems that can encapsulate a wide variety of network layer protocols inside virtual pointtopoint links or pointtomultipoint links over an internet protocol network. Routing configuration guide, cisco ios xe everest 16. Gre does not include strong security to protect its payload. Enter the destination, this is not the ip of the tunnel at the other. How to configure gre tunnels for the mcn site optional. Support is avaliable for ipv4 multic ast over pointtopoint generic routing encapsulation gre tunnels.
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