ADSL VPN backup for Fibre connection

Unanswered Question
Aug 26th, 2009
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I have a dedicated fibre connection between 2 of our primary sites with direct routing between the firewalls at the edge of each site.

Each site also has an ADSL connection for emergency internet, which I have connected to the firewalls with a floating route for internet traffic.

However in the event of the fibre failing whilst we would still have internet access we would lose inter-site connectivity as such I was thinking of setting up a VPN between the ADSL interfaces encryption the LAN traffic so the inter-site connection would continue.

The problem i forsee is that the VPN path would take priority even when the fibre is up?

Has anyone done anything similar?

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