Big IP as default Gateway

Without understanding your architecture, let me summarize the requirements:

 

 

1) Your 0.0.0.0/0 virtual forwarder applied to all vlans allows TMM to pass the traffic, IF there are routes to the destinations.

 

 

2) Any traffic between locally connected subnets will be permitted without any additional routes, IF the hosts on the vlans route the traffic to BigIP

 

 

3) Any traffic received by the BigIP for a remote subnet will require a route on the BigIP to the GW for that remote subnet

 

 

4) If translations are required for traffic to return, that must be considered either on the BigIP or on the GW in front of the BigIP

 

 

5) If the source, vip, & destination are all on the same subnet, you'll need to configure translation so the destination routes the traffic back through the BigIP before sending back to the source (for tcp traffic)

 

 

If you submit a drawing of your architecture with generic (false) IP's and vlans, I'm sure we'll get there.