inet port exhaustion - urgent help needed

It sounds like you're using SNAT auto map on this virtual server. If you are, that's almost positively your problem. I've run into this exact scenario before, with aggressive DNS traffic causing ephemeral port exhaustion. Fortunately, the fix is relatively easy: use a snat pool with multiple addresses in it. This will do a few things:

 

 

1) You'll get a ton ephemeral more ports for the virtual server.

 

2) If you need more, simply add another SNAT address to the pool.

 

 

While this is a painful problem when you run into it, a SNAT pool should immediately fix your issue. Have a look at https://support.f5.com/kb/en-us/solutions/public/2000/500/sol2561.html for a bit more info on this.

 

 

-Matt