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 PTR
There'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/