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RV180W loses port forwarding rules when switching WAN connections

We have a backup WAN connection in our office, but we switch this connection manually on our RV180W when the primary goes down. Our normal connection is ADSL with PPPoE, and the backup is Cable with DHCP.

However, we also have some port forwarding rules for our VoIP PBX (UDP port 5060) as well as SSH, and these rules seem to stop working completely when we switch our WAN connection to our cable connection. We can still surf the web from our workstations, but our incoming phone calls and SSH connections all cease to work completely. The problem does not persist after we've switched back to our normal ADSL connection.

This behaviour is completely bizarre and suggests that there's some kind of bug in the Cisco RV180W.

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