nanog mailing list archives
Re: what happens when you put a typo in a DNSBL server?
From: Wes Hardaker <wjhns61 () hardakers net>
Date: Tue, 16 Jan 2007 13:19:40 -0800
"JL" == John Levine <johnl () iecc com> writes:
Previous to this date a misconfigured ISP was just not being protected by the BL. Now, it's potentially dropping all mail from anyone because of the typo.
JL> If only. I am constantly amazed at the bozos who misconfigure their JL> DNSBL lookups and don't notice. Part of the problem is that the protocol is designed to overlay an existing protocol without providing a valid positive response. In this case, lame ISP configures a typo and goes for ages without noticing that it didn't help them at all because every query was getting a NXDOMAIN back and they didn't check the traffic. Had this been a real protocol you would have gotten back a 404 like message instead! Shoe-horning DNS (or any protocol) into a solution works well only if you don't make mistakes. And we know that never happens. In the end, you don't get error messages when you misconfigure a DNSBL. That's an architectural issue with how DNSBLs work in the first place. -- "In the bathtub of history the truth is harder to hold than the soap, and much more difficult to find." -- Terry Pratchett
Current thread:
- what happens when you put a typo in a DNSBL server? Wes Hardaker (Jan 16)
- Re: what happens when you put a typo in a DNSBL server? Alexander Harrowell (Jan 16)
- Re: what happens when you put a typo in a DNSBL server? John Levine (Jan 16)
- Re: what happens when you put a typo in a DNSBL server? Wes Hardaker (Jan 16)
- Re: what happens when you put a typo in a DNSBL server? John L (Jan 16)
- Re: what happens when you put a typo in a DNSBL server? Steve Sobol (Jan 19)
- Re: what happens when you put a typo in a DNSBL server? Wes Hardaker (Jan 16)
- Re: what happens when you put a typo in a DNSBL server? Chris L. Morrow (Jan 16)
- Re: what happens when you put a typo in a DNSBL server? Steve Linford (Jan 16)
- Re: what happens when you put a typo in a DNSBL server? Steve Atkins (Jan 17)