[lug] TCP port 53?

[dan radom]

* Jeffrey Siegal (jbs at quiotix.com) wrote:
> Chip Atkinson wrote:
> >If I'm running a name server, do I need to have TCP port 53 open?
> 
> Yes, although a lot of people don't and it still mostly works.
> 
> >I know DNS uses UDP, but does it use TCP as well?
> 
> Yes.  It will switch to TCP for any requests that are too large to fit 
> in a UDP packet.
> 

as i understand it it uses udp for queries and tcp for zone xfers.  it
has nothing to do with size.