DNS Connection Question

[bob at rsi.com (Bob Gorman)]

At 09:48 AM 10/20/2004, trlists at clayst.com wrote:
>> Nameservers always try 53 UDP first, because most requests and
>> responses will fit into a single packet.
>
>That implies that sometimes they don't, which makes me wonder if a 
>nameserver which only accepts UDP on port 53 is fully functional.  Is 
>it?  Guess I should read some more details on DNS.

It's not necessarily a [name]server issue. Some firewall maintainers only open DNS on UDP.