[105167] in North American Network Operators' Group
Re: DNS problems to RoadRunner - tcp vs udp
daemon@ATHENA.MIT.EDU (Bill Owens)
Fri Jun 13 14:34:17 2008
Date: Fri, 13 Jun 2008 14:33:57 -0400
From: Bill Owens <owens@nysernet.org>
To: Jon Kibler <Jon.Kibler@aset.com>
Mail-Followup-To: Jon Kibler <Jon.Kibler@aset.com>,
Mark Price <mprice@tqhosting.com>, nanog@merit.edu
In-Reply-To: <4852B91F.8090205@aset.com>
Cc: nanog@merit.edu
Reply-To: owens@nysernet.org
Errors-To: nanog-bounces@nanog.org
On Fri, Jun 13, 2008 at 02:14:55PM -0400, Jon Kibler wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Mark Price wrote:
> <SNIP>
> >>From what I have read, public DNS servers should support both UDP and
> > TCP queries. TCP queries are often used when a UDP query fails, or if
> > the answer is over a certain length.
> >
>
> UDP is used for queries.
>
> TCP is used for zone transfers.
>
> If my server responded to TCP queries from anyone other than a secondary
> server, I would be VERY concerned.
Red alert:
[cookiemonster:~] owens% dig +tcp aset.com @209.190.93.130 soa
; <<>> DiG 9.4.2 <<>> +tcp aset.com @209.190.93.130 soa
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5864
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 5, ADDITIONAL: 2
;; WARNING: recursion requested but not available
;; QUESTION SECTION:
;aset.com. IN SOA
;; ANSWER SECTION:
aset.com. 14400 IN SOA ns1.sims.net. hostmaster.aset.com. 2006111001 10800 3600 3600000 86400
;; AUTHORITY SECTION:
aset.com. 14400 IN NS ns3.trustns.net.
aset.com. 14400 IN NS ns1.sims.net.
aset.com. 14400 IN NS ns1.trustns.net.
aset.com. 14400 IN NS ns2.sims.net.
aset.com. 14400 IN NS ns2.trustns.net.
;; ADDITIONAL SECTION:
ns1.sims.net. 86400 IN A 209.190.93.130
ns2.sims.net. 86400 IN A 209.190.93.132
;; Query time: 31 msec
;; SERVER: 209.190.93.130#53(209.190.93.130)
;; WHEN: Fri Jun 13 14:31:13 2008
;; MSG SIZE rcvd: 211
Bill.
