From: Chris Brenton <cbrenton@chrisbrenton.org>
To: Antony Stone <Antony@Soft-Solutions.co.uk>
Cc: netfilter <netfilter@lists.netfilter.org>
Subject: Re: Packets missing state ?
Date: Tue, 23 Dec 2003 12:13:33 -0500 [thread overview]
Message-ID: <1072199612.2184.467.camel@grendel> (raw)
In-Reply-To: <200312231533.40728.Antony@Soft-Solutions.co.uk>
On Tue, 2003-12-23 at 10:33, Antony Stone wrote:
>
> > > Yes. UDP port 53 means client-to-server DNS lookups.
> >
> > It could also be server to server queries as well as a load balancer.
>
> I thought server to server queries were always TCP?
Nope. UDP is always used unless the "answer" will exceed a packet length
of 512 bytes. If this max is exceeded, as complete an answer as possible
is returned with the truncation bit turned on in the DNS header. After
that, you'll see the session switch over to TCP for a complete answer.
The other case is primary/master <--> secondary/slave communications for
the purpose of zone transfers.
Dig and other tools will let you choose to use TCP, but the default is
UDP.
HTH,
C
next prev parent reply other threads:[~2003-12-23 17:13 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-23 12:58 Packets missing state ? Rajiv Shah
2003-12-23 13:08 ` Antony Stone
[not found] ` <200312231857.21676.vinayakm@theargoncompany.com>
2003-12-23 13:37 ` Vinayakam Murugan
2003-12-23 13:54 ` Antony Stone
2003-12-23 15:21 ` Chris Brenton
2003-12-23 15:33 ` Antony Stone
2003-12-23 16:00 ` Cedric Blancher
2003-12-23 17:13 ` Chris Brenton [this message]
2003-12-23 13:55 ` Cedric Blancher
2003-12-24 4:12 ` Vinayakam Murugan
2003-12-24 7:48 ` Cedric Blancher
2003-12-24 8:18 ` Vinayakam Murugan
2003-12-24 8:42 ` Cedric Blancher
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