GRE Tunnel with DHCP address on 871W

Answered Question
Aug 3rd, 2007

I am trying to set up a GRE tunnel so I can send routing updates and QOS between sites. Right now, we have a 2611XM and an 871W. How can I configure this if the 871W router is using DHCP for the WAN (2611XM is a static address)? I'm suck trying to figure out what to do for the "tunnel destination" on the 2611XM.

I have this problem too.
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Correct Answer by mattiaseriksson about 9 years 4 months ago

NHRP allows the peers to have dynamic addresses (ie: Dial and DSL) with GRE / IPsec tunnels.

What you do on the 2611 is to configure mGRE tunnel mode, and on both sides you configure NHRP in order for the 871 to register with the 2611.

When you use this with ipsec, you can for example configure QoS groups in the ISKAMP profiles.

http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/hiad_c/hadnhrp.htm

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spremkumar Sun, 08/05/2007 - 20:21

Hi

To have the destination address in Cisco 2611XM you need a static ip at the 871W end.

You can either get an ip address from the SP and configure it as your loopback which you can make use of at the remote end.

Or else get a static ip assigned to your wan interface on the 871W so that it can be used as tunnel destination at the remote end.

regds

Correct Answer
mattiaseriksson Sun, 08/05/2007 - 23:52

NHRP allows the peers to have dynamic addresses (ie: Dial and DSL) with GRE / IPsec tunnels.

What you do on the 2611 is to configure mGRE tunnel mode, and on both sides you configure NHRP in order for the 871 to register with the 2611.

When you use this with ipsec, you can for example configure QoS groups in the ISKAMP profiles.

http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/hiad_c/hadnhrp.htm

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