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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: what happens when you put a typo in a DNSBL server?
>>>>> "JL" == John Levine <[email protected]> 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
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