We are using this dble NAT solution on PPPoA lines in the UK but are having great difficulties getting the MX64 to fail over from the Internet port (which is connected to one PPPoA DSL modem) to LAN4 port (configured as an internet port and which is connected to another PPPoA DSL modem).  Both the Internet port and the LAN4 port are configured for Direct connection and DHCP from their respective PPPoA DSL routers.  Problem is, we can't get a 'soft failover' to occur (ie. we unplug the dsl cable from the modem connected to the Internet port - to simulate an ISP issue) from the Internet port to the still up-and-working port4.  The only way we find we can get the failover to occur is by simulating a 'hard failover' where we unplug the DSL modem from the Internet port so that the Internet port drops.  This is not an ideal situation - any ideas or thoughts? ... View more