Different forwarder for certain response ip (result ip )

[Reindl Harald]

Am 16.09.2017 um 13:19 schrieb Omid Kosari via bind-users:
> Wow . I love active community .
> 
> Actually my situation is a bit strange . But as explanation i can say that
> our upstream provider do dns manipulation on normal ports 53 tcp/udp (please
> don't ask why). We may not use vpn or tunnels . The only way is using
> alternate ports as forwarders.
> 
> But i can not use alternate ports as my main forwarders because if so , then
> upstream provider may be aware of that and manipulate them also

you pretty overestimate the work a ISP is willing to invest

that will surely not happen and if it's only because it would require 
deep packet inspection which would require hardware ressources and cost 
money while port based manipulation is technically cheap