> On Jun 15, 2015, at 8:00 PM, Randy Bush <ra...@psg.com> wrote:
> 
> dns is udp


15 years ago when we set up 4.2.2.1, there was a fair amount of TCP based DNS.  
 We tried for a bit to support it via the anycast address, but ultimately we 
decided the support issues weren’t worth it.  The few customers that 
asked/required it were given non-anycast addresses to use for TCP based DNS. 

I really think the OPs best answer is some DNS based load balancer, that can 
take metrics based on routing.

johno



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