Re: IPv4 ANYCAST setup

[Owen DeLong <owen () delong com>]

On Mar 26, 2010, at 6:40 AM, Max Larson Henry wrote:

> > > has someone experience in anycast ipv4 networks (to support DNS)?
> >
> > "Never been done" "Dangerous" "TCP does not work" etc etc etc.
>
> - Yes but as for DNS, anycast is essentially used for user requests  
> (UDP)
> not to perform zone transfer(TCP).
>
> -M

The number of DNS queries for user requests that are in UDP in IPv4
is nearly all.  When you start seeing hosts with more than a couple
of AAAA records, you will start seeing more user requests in TCP.

FWIW, World of Warcraft authentication actually involves some hosts
with enough A records to require TCP.

Owen