[124204] in North American Network Operators' Group
Re: IPv4 ANYCAST setup
daemon@ATHENA.MIT.EDU (Owen DeLong)
Fri Mar 26 13:05:12 2010
From: Owen DeLong <owen@delong.com>
To: Max Larson Henry <maxlarson.henry@mtptc.gouv.ht>
In-Reply-To: <90155a1e1003260640o30471802u884af64208873684@mail.gmail.com>
Date: Fri, 26 Mar 2010 10:01:30 -0700
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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
