[19824] in North American Network Operators' Group
Re: UDP packet/DNS server
daemon@ATHENA.MIT.EDU (Megatron)
Mon Sep 28 10:38:08 1998
Date: Mon, 28 Sep 1998 00:34:15 -0400 (EDT)
From: Megatron <madlion@neteng.net>
To: Matthew Petach <mpetach@netflight.com>
cc: Tatsuya Kawasaki <tatsuya@giganet.net>, nanog@merit.edu
In-Reply-To: <199809280411.VAA22613@falcon.netflight.com>
On Sun, 27 Sep 1998, Matthew Petach wrote:
> >
> > Hello Nanog,
> >
> > I am trying get zone trasfer from a host, but it seems that because of
> > firewals?, I can not get any record.
> > They acknowelged that there is a host behind the firewalls but they claim
> > it should not affect it. (I don't believe it.)
> > But I don't know how to check/prove that if certain host can
> > receive/send an UDP packet.
>
> Zone transfers are handled via TCP, not UDP. See if you
> can telnet to port 51 on their nameserver; if you can't
> get a connection established, you won't be able to do
> a zone transfer.
>
I think you mean port 53. This is both TCP and UDP. I thought DNS
used both TCP and UDP. Thus firewall that is blocking UDP traffic will
cause zone updates to fail.
name 42/udp nameserver
whois 43/tcp nicname # usually to sri-nic
domain 53/tcp
domain 53/udp
Cheers
> > TIA,
> > Tatsuya
>
> Matt
>
