I am working with a 2-site setup, connected via a dedicated T1. One site has had that connection go down a couple of times, so we want to use a cable connection along with a site-to-site VPN for redundancy in case the T1 gets cut again.
I'd like some help about how to make that connection take over in case of failure of the first one. I know that you can set a backup interface, but how does that work with VPN setups?
Also, on another topic, I seem to recall a limitation about using site-to-site VPN connections with pre-shared keys, where you are limited to only 1 VPN. We will be connecting a third site shortly to the main site - does this mean we need to go with certificates instead of PSK?
Thanks
Adam
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