IPv4 ANYCAST setup
Owen DeLong
owen at delong.com
Fri Mar 26 17:01:30 UTC 2010
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
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