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Re: UDP packet/DNS server
- From: Megatron
- Date: Mon Sep 28 16:04:51 1998
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
> > TIA,
> > Tatsuya