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I recently added a backup internal interface using IP SLA to cutover our inside interface in the event that our internet gateway crashes. I'm also attempting to route all traffic from the internal network to the DMZ over this backup internal interfa...
Thanks jocamare. It turns out the problem was caused by the return path being different as the traffic traversed the firewall through inside2 and returned through inside1 due to a route on the inside switch. Ping (and other connectionless protocols...