North American Network Operators Group
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Re: UDP packet/DNS server

  • From: Aaron Goldblatt
  • Date: Tue Sep 29 18:49:15 1998 
>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

Queries are done via UDP; zone transfers are always fully TCP.

ag