Search Again: Re: DNS Port(s) From: Men & Mice Support Date: Saturday, March 4, 2000 Time: 11:11:00 am At 10:00 AM +0000 3/4/2000, Simon Forster wrote: >Quick ? > >DNS services happen on port 53 but how/what ports does QuickDNS use to >transfer data for secondary services. > >Perhaps I should explain. I have my QuickDNS server behind a firewall. >Everything works fine at the moment 'cause I allow all requests through to >this machine but I'd like to limit it to just having the ports required for >full DNS services open so... > >I need to open port 53 for UDP but do I need to open another port? DNS queries are usually, but not always, sent on UDP port 53. Some programs (dig, for ex.) send them on TCP port 53. Zone transfers usually happen through TCP port 53. Some programs (dig, for example) request zone transfers through UDP port 53. All standards-based DNS traffic happens on port 53, either UDP or TCP. Non-standards-based DNS traffic would include such things as the LPM packets used in QuickDNS' fault tolerance. ____________________________________________________________________ Chris Buxton cbuxton@menandmice.com Men & Mice http://www.menandmice.com Makers of: QuickDNS Pro

Messages In This Thread: DNS Port(s) by Simon Forster on Mar 4, 2000 at 10:00:00 am Re: DNS Port(s) by Men & Mice Support on Mar 4, 2000 at 11:11:00 am