Create crypto via several public interfaces

Hi guys,.

We have an easy no. 2851 being used as a VPN server router. It is connected to the Internet via a connection fiber on GI0/1 to isps1. Our remote sites to connect with success in the router and the cryptographic sessions are built successfully.

We have now an another fiber connection in the server that we want to use on a base ad-hoc to connect remote sites in our VPN, mainly under the new fiber is a connection high speed and we can thus obtain a "high speed" connection of the remote control through it.

Then, when I distance switch a site the new ISP connection I change his counterpart from x.x.x.y to m.m.m.n. Crypto by ISP2 connection requests come in the server. However it seems that the responses to these requests are returned to the remote control through isps1, and hence Cryptography is never created successfully.

My static routes are as follows:

IP route 0.0.0.0 0.0.0.0 x.x.x.x 30 permanent

IP route x_network 255.255.255.240 x.x.x.x 20 permanent

IP route m_network 255.255.255.248 m.m.m.m 20 permanent

Now, if I change the gateway of last resort to the "ip route 0.0.0.0 0.0.0.0 m.m.m.m 30" then cryptography is established, but after a minute or two of all the other crypto on x.x.x.x begins to die.

My question is though, how to keep the two fibers connected to the router at the same time and have some sites to connect via isps1, while another connect via ISP2.

A solution would be to use two routers, one for each ISP connection. With that you would have true redundancy for your hub. To make sure that traffic has reached the right exit point, you can use reverse-route-injection and a dynamic routing protocol.

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Tags: Cisco Security

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