two ethernet cards and traffic to http server

I'm looking for a simple set of requirements to fix a network issue.

They are changing internet providers, so 10.0.1.5 is the old router, and
10.0.1.6 is the new

Firewall forwards port 80 traffic to the ip of one of the Ethernet cards

Old was the 10.0.1.254 new was 10.0.1.200

The 2nd dftroute did not exist till cutover

Old router left up for other traffic



*DFTROUTE *NONE 10.0.1.5 *NONE this
router going away

*DFTROUTE *NONE 10.0.1.6 10.0.1.200 web
traffic

52.41.XXX.XX *HOST 10.0.1.5 10.0.1.254



This worked fine for a day, then full system backup and then web traffic did
not work, but no messages.

DNS is a local Win server

Is it possible to keep both Ethernet going or does it need to be single ?

RPG CGI and a basic Apache config.

Jim