nanog mailing list archives
Re: question on ptr rr
From: "Andrew - Supernews" <andrew () supernews net>
Date: Sun, 08 Feb 2004 22:44:15 +0000
"Chris" == Chris Adams <cmadams () hiwaay net> writes:
Once upon a time, Andrew - Supernews <andrew () supernews net> said:If you're going to get picky about HELO names, then it's better to require that the HELO has an A record pointing to the connecting IP, rather than look at PTR.
Chris> That isn't necessarily a good test; There _is_ no good test, which is one reason why the RFC says unequivocally "don't do that". Chris> for example, we've got a couple of servers in a cluster. One Chris> IP pointed at the cluster is mail.hiwaay.net, and that is what Chris> is used in HELO/EHLO when making outbound connections, but the Chris> connections don't come from that IP. They come from the Chris> cluster member's IP so that when we get a complaint with Chris> sending IP, we don't have to look through the logs for the Chris> whole cluster to find the offender. In that case you'll fail _any_ sort of verification on the HELO, so it doesn't really matter whether the recipient uses the PTR or the A record. -- Andrew, Supernews http://www.supernews.com
Current thread:
- Re: question on ptr rr, (continued)
- Re: question on ptr rr Randy Bush (Feb 07)
- Re: question on ptr rr Sean Donelan (Feb 07)
- Re: question on ptr rr Steven M. Bellovin (Feb 08)
- Re: question on ptr rr Paul Vixie (Feb 08)
- Re: question on ptr rr Randy Bush (Feb 07)
- Re: question on ptr rr Paul Vixie (Feb 07)
- Re: question on ptr rr Sean Donelan (Feb 07)
- Re: question on ptr rr Paul Vixie (Feb 08)
- Re: question on ptr rr Andrew - Supernews (Feb 08)
- Re: question on ptr rr garrett.allen (Feb 08)
- Re: question on ptr rr Chris Adams (Feb 08)
- Re: question on ptr rr Andrew - Supernews (Feb 08)
- Re: question on ptr rr Sean Donelan (Feb 07)
- Re: question on ptr rr Lou Katz (Feb 08)
- Re: question on ptr rr Valdis . Kletnieks (Feb 08)
- Re: question on ptr rr Niels Bakker (Feb 09)
- Re: question on ptr rr Robert E. Seastrom (Feb 09)
- Re: question on ptr rr Daniel Senie (Feb 09)
- Re: question on ptr rr Randy Bush (Feb 09)
- Re: question on ptr rr Valdis . Kletnieks (Feb 09)
- Re: question on ptr rr Arnold Nipper (Feb 09)
- Re: question on ptr rr Paul Vixie (Feb 09)