Using Big-IP as a router

I have a couple loadbalanced windows servers configured with their defaultroute set to the BigIP's floating IP - works great except for when they attempt the mothership and it fails because the BigIP is not forwarding or returning the outbound packets and windows can't get its updates.

 

We've added a few persistent routes so these nodes can route Microsoft traffic around the BigIP - but MS changes their IP nets all the time so this fails after a while.

 

What is the best way (least disruptive) to allow the BigIPs to route this type of traffic?

 

 

thanks,

 

Fletch.