DNS ports and firewall

Kevin Darcy kcd at daimlerchrysler.com
Fri Jun 21 21:28:20 UTC 2002

Armin Safarians wrote:

>         Sorry, I'm domed using outlook and any ways. My question is...
>         I know that DNS uses UDP/53 for queries. Tcp/53 is only used to
> do zone transfers and large queries.
>         What is considered large queries and is it ok to just allow udp
> through the firewall.

You must allow both UDP and TCP.

                                                                                    - Kevin

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