Re: ubr 7100 -- failover or load balancing using 2 DSL circuits
If you have 2 different circuits each one with a separate block of addresses, and IF your ISP is not
performing some sort of source ip so it matches the block you have (something like the "verify
source unicast" command in IOS) then you could load balance your OUTGOING traffic to the
internet, but return traffic will always come back through the link that owns the ip address your
hosts used to go out. This is a limitation you would have on routing unless you own your block of
addresses and can run BGP with your ISP(s) in both links. Another solution would be for the router to load balance traffic out using both block of addresses that way the return traffic would come back on the corresponding link, but this would not allow you to statically assign an ip address to the hosts in your network. This would need to be worked out with NAT on the router and it would be load balanced per session.
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