Hi,
It may be a longshot but is it possible to have a persistent route on a virtual IP address (NLB cluster IP)?
The reason is that I need to add a persistent route to a particular subnet for my two exchange CAS servers. I am able to add the routes for the IPs of each CAS server but need it for the NLB cluster IP as the DNS record for my CAS array points to the NLB IP. The client on the particular subnet can ping the individual CAS server IPs but not the NLB IP.