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VPN load balancing on Cisco router

Posted on 2007-03-28
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Last Modified: 2010-04-17
Hi

I have a 2800 series router at a remote location with 2 WIC's. The ISP has provided me with 2 T1 lines but will not bundle them (they have 2 different IP subnets. I need to establish a site-to-site VPN to the main location. Is there a way I can load balance traffic between 2 VPN tunnels?
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Question by:netman70
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billwharton earned 500 total points
ID: 18812484
Yes, you'll need a crypto map configured on each interface and establish a VPN tunnel through each interface. Thereafter, you can set up your routes to the remote network through both interfaces and this do the load-balancing. Not a very graceful solution though
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by:netman70
ID: 18812672
Once Crypto maps have been configured for each interface, how would I load balance traffic  through the 2 tunnels? How would I configure routing statements for VPN traffic? Am I looking at problems with out-of-sequence packets?

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by:billwharton
ID: 18812776
your best bet would to break up the remote network into two subnets and route each subnet over different routes.
So if you have a 10.1.1.0/24 network, break it into 10.1.1.0/25 giving you two subnets:
10.1.1.1 - 10.1.1.127 &
10.1.1.128 - 10.1.1.254

Then establish two routes for each outgoing interface and put in both the above networks on the routes but with different metrics. For routing, all you have to do is put in:
ip route <remote LAN subnet> <remote LAN subnet mask> <gateway which will be ISP's router>

This is a kind of a solution that has to be tried to see how it works. Cisco doesn't have any config examples for this
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by:billwharton
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Did that work out well for you?
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