Search Again: Re: Multiple CNAMES... who cares? From: Men & Mice Support Date: Friday, July 30, 1999 Time: 10:56:00 pm >Men & Mice Support said: > >>>oops, you're right! Thanks, Chris, for clarifying all the points (er, >>>PTRs). I meant to say: >>> >>>> >Right now, I have it set up like so: >>>> > >>>> >mydomain.com. NS ns2.mydomain.com. >>>> >ns2.mydomain.com. A 198.0.0.0 >>>> > >>>> >mydomain.com. MX mail.mydomain.com >>>> >mail.mydomain.com CNAME ns2.mydomain.com >>> >>>But I realize that this would be wrong. >>> >>>However, using the above scenario, does it matter if my secondary DNS >>>("ns2") doesn't have a PTR record (I have to reserve the PTR for the >>>mailserver record)? >> >>PTR records are almost totally irrelevant for a server. > >Are you sure about this? Pretty much. I haven't seen any other service besides mail that needs a PTR record for itself. The only reason a mail server needs a PTR record is for when it acts as a peer. In peer-to-peer interactions, I can see it. But I don't know of any client software that checks the reverse record for a server. >>The only service for which PTR records are currently used is mail, for >>anti-spam measures. Therefore, it is important to have a PTR record that >>matches the name of your mailhost (as specified in your MX record). > >I number of IRC and ftp servers, (especially on the University level) >require that they be able to check your reverse records to allow access. Those are PTR records for the clients. I'm talking about a PTR record for the server. The IRC and FTP servers you mentioned don't care what their own PTR records say, just those of the clients that log in. ____________________________________________________________________ Chris Buxton Men & Mice cbuxton@menandmice.com http://www.menandmice.com

Messages In This Thread: Multiple CNAMES... who cares? by Jimi Sweet on Jul 29, 1999 at 10:32:00 am Re: Multiple CNAMES... who cares? by Men & Mice Support on Jul 29, 1999 at 11:09:00 am Re: Multiple CNAMES... who cares? by Steve Linford on Jul 29, 1999 at 11:27:00 am Re: Multiple CNAMES... who cares? by andrew kagan on Jul 29, 1999 at 12:57:00 pm Re: Multiple CNAMES... who cares? by Men & Mice Support on Jul 30, 1999 at 8:21:00 am Re: Multiple CNAMES... who cares? by andrew kagan on Jul 30, 1999 at 12:23:00 pm Re: Multiple CNAMES... who cares? by Men & Mice Support on Jul 30, 1999 at 12:34:00 pm Re: Multiple CNAMES... who cares? by andrew kagan on Jul 30, 1999 at 1:14:00 pm Re: Multiple CNAMES... who cares? by Men & Mice Support on Jul 30, 1999 at 1:38:00 pm Re: Multiple CNAMES... who cares? by andrew kagan on Jul 30, 1999 at 2:14:00 pm Re: Multiple CNAMES... who cares? by Mia''s Virtual Post Office on Jul 30, 1999 at 5:59:00 pm Re: Multiple CNAMES... who cares? by Mia''s Virtual Post Office on Jul 30, 1999 at 6:02:00 pm Re: Multiple CNAMES... who cares? by Men & Mice Support on Jul 30, 1999 at 10:56:00 pm Re: Multiple CNAMES... who cares? by Men & Mice Support on Jul 30, 1999 at 11:10:00 pm