Hey folks ... I've got a failover question for everyone. I have a hub/spoke WAN with 7 remote sites, all PTP T1's. The core has a 3700 router behind a PIX515, the remotes are all 1721's. I need a failover path incase of T1 outtage.
Is it possible to run a DSL line into the remotes, then have the router automagically start a VPN tunnel to the core router through the Internet incase a T1 dies?
If i'm smoking crack by thinking this will work, let me know and suggest another path.
It can be done quite easily. Detecting loss of a T1 is trivial as long as you enable keepalives. Then use a floating static route to select the VPN path when needed. Alternatively, keep the VPN connection up 24x7, use a routing protocol on both T1 and VPN, and give the T1 a better metric.
Either way, make sure you regularly test the VPN functionality. Otherwise, the better your T1s, the more likely you'll find the DSL dead when you finally need it.
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