tcp or udp

phn at phn at
Thu Jun 27 22:17:14 UTC 2002

Frank Liu <liug at> wrote:
> Hi all,
> If I configure the fw to ONLY allow tcp port 53 to my nameservers,
> will it cause a problem for the clients and their resolver nameservers?

Yes. Your clients most likly want's to use UDP/53 too.

> I understand udp is more efficient. I just want to do if tcp will work.

Then you need to modify your clients ( or get some old AIX which actually
did this by default to our amusement :-)

> Thanks!
> Frank

Peter Håkanson         
        IPSec  Sverige      ( At Gothenburg Riverside )
           Sorry about my e-mail address, but i'm trying to keep spam out,
	   remove "icke-reklam" if you feel for mailing me. Thanx.

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