nanog mailing list archives
Re: rDNS naming conventions (was: Re: SORBS Contact)
From: Steven Champeon <schampeo () hesketh com>
Date: Thu, 10 Aug 2006 15:44:03 -0400
on Thu, Aug 10, 2006 at 08:55:37PM +0530, Suresh Ramasubramanian wrote:
On 8/10/06, Steven Champeon <schampeo () hesketh com> wrote:redundancy "bigisp-foo-bar-baz.dyn.bigisp.net". Worst among those who actually provide rDNS in SE Asia is probably tm.net.my, who name all of their customer PTRs 'tm.net.my'. Hm. Maybe encoding the IP in the PTRThere's at least one vietnamese ISP that has / had till recently set "localhost" as rDNS for all their IPs.
IIRC, that was fpt.vn; they replaced 'localhost' with the incredibly useful: adsl-pool-xxx.fpt.vn adsl-fix-xxx.fpt.vn dialup-xxx.fpt.vn adsl-dynamic-pool-xxx.fpt.vn \d+-\d+-\d+-xxx-dynamic.hcm.fpt.vn host-\d+-xx.hcm.fpt.vn \d+-\d+-\d+-xxx-dynamic.hcm.fpt.vn Yes, the 'xxx's are literals. e.g., $ host 210.245.14.143 143.14.245.210.in-addr.arpa domain name pointer dialup-xxx.fpt.vn. Or it may have been hnpt.com.vn, who replaced it with e.g., adsl.hnpt.com.vn Again, not terribly useful for tracking leakage via NATs. $ host 203.210.213.149 149.213.210.203.in-addr.arpa domain name pointer adsl.hnpt.com.vn. But hey, at least they *have* rDNS, I suppose that's something. I agree that judgements based entirely on rDNS are troublesome. So, too, are the side effects of chemotherapy. But we're trying to save the patient before the miracle cures arrive, and right now email is very, very sick indeed. And rDNS is a useful tool especially in a scoring-based environment. -- hesketh.com/inc. v: +1(919)834-2552 f: +1(919)834-2553 w: http://hesketh.com/ antispam news, solutions for sendmail, exim, postfix: http://enemieslist.com/ rambling, amusements, edifications and suchlike: http://interrupt-driven.com/
Current thread:
- Re: SORBS Contact, (continued)
- Re: SORBS Contact Aaron Glenn (Aug 09)
- Re: SORBS Contact Noel (Aug 09)
- Re: SORBS Contact Aaron Glenn (Aug 09)
- Re: SORBS Contact Noel (Aug 09)
- Re: SORBS Contact Matthew Sullivan (Aug 09)
- Message not available
- Re: SORBS Contact Matthew Sullivan (Aug 09)
- Re: SORBS Contact william(at)elan.net (Aug 10)
- Re: SORBS Contact Robert E . Seastrom (Aug 10)
- rDNS naming conventions (was: Re: SORBS Contact) Steven Champeon (Aug 10)
- Re: rDNS naming conventions (was: Re: SORBS Contact) Suresh Ramasubramanian (Aug 10)
- Re: rDNS naming conventions (was: Re: SORBS Contact) Steven Champeon (Aug 10)
- Re: rDNS naming conventions (was: Re: SORBS Contact) Nicholas Suan (Aug 10)
- Re: rDNS naming conventions (was: Re: SORBS Contact) bmanning (Aug 10)
- Re: rDNS naming conventions (was: Re: SORBS Contact) Edward Lewis (Aug 10)
- Re: SORBS Contact Peter Corlett (Aug 10)
- Re: SORBS Contact Andrew D Kirch (Aug 11)
- Re: SORBS Contact Mark Andrews (Aug 09)
- Re: SORBS Contact Matthew Sullivan (Aug 09)
- Re: SORBS Contact Mark Andrews (Aug 09)
- Re: SORBS Contact Matthew Sullivan (Aug 09)
- Re: SORBS Contact Noel (Aug 10)