nanog mailing list archives
Re: fixing insecure email infrastructure (was: Re: [eweek article] Window of "anonym
From: Valdis.Kletnieks () vt edu
Date: Thu, 13 Jan 2005 10:21:20 -0500
On Thu, 13 Jan 2005 12:21:04 +0100, Stephane Bortzmeyer said:
American bias but remember the Internet is worldwide. I do not know how it is in the USA but there are many parts of the world where ISP do not have a delegation of in-addr.arpa and therefore cannot pass it to their customers. (It is also common to have many levels of ISP, so you need to go through many layers before reaching the RIR.)
That is indeed a problem that needs to be solved if you want any sort of rDNS-based service to work well.
Requesting rDNS means "I don't want to receive email from Africa".
Having an rDNS entry for a host doesn't mean you know if it is/isn't in Africa, to any higher degree of certainty than when you just had the IP address. I'm not on our campus. But I can see it from out my office window. (The official campus starts across the street from me). I'm about 4 hours drive southwest of Washington DC. professory.cesa.vt.edu is 195.176.186.74, and has a proper PTR entry back. It's a host of ours. It's in Switzerland at our Center for European Studies and Architecture. So what did that rDNS entry tell you about its location that you didn't know from 195.176/16?
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Current thread:
- Re: fixing insecure email infrastructure (was: Re: [eweek article], (continued)
- Re: fixing insecure email infrastructure (was: Re: [eweek article] Markus Stumpf (Jan 25)
- Re: fixing insecure email infrastructure (was: Re: [eweek article] Mark Andrews (Jan 25)
- Re: fixing insecure email infrastructure (was: Re: [eweek article] Markus Stumpf (Jan 25)
- Re: fixing insecure email infrastructure (was: Re: [eweek article] Mark Andrews (Jan 25)
- Re: fixing insecure email infrastructure (was: Re: [eweek article] Markus Stumpf (Jan 25)
- RE: fixing insecure email infrastructure (was: Re: [eweek article] Window of "anonymity" when domain exists, whois not updated yet) Joseph Johnson (Jan 13)
- Re: fixing insecure email infrastructure (was: Re: [eweek article] Window of "anonymity" when domain exists, whois not updated yet) william(at)elan.net (Jan 12)
- Re: fixing insecure email infrastructure (was: Re: [eweek article] Window of "anonymity" when domain exists, whois not updated yet) Steven Champeon (Jan 13)
- Re: fixing insecure email infrastructure (was: Re: [eweek article] Window of "anonym Stephane Bortzmeyer (Jan 13)
- Re: fixing insecure email infrastructure (was: Re: [eweek article] Window of "anonym Stephane Bortzmeyer (Jan 13)
- Re: fixing insecure email infrastructure (was: Re: [eweek article] Window of "anonym Valdis . Kletnieks (Jan 13)
- Re: fixing insecure email infrastructure (was: Re: [eweek article] Window of "an Stephane Bortzmeyer (Jan 13)
- Re: fixing insecure email infrastructure (was: Re: [eweek article] Window of "an Eric Brunner-Williams in Portland Maine (Jan 13)
- Re: fixing insecure email infrastructure (was: Re: [eweek article] Window of "an Barry Shein (Jan 13)
- Re: fixing insecure email infrastructure (was: Re: [eweek article] Window of "anonym Owen DeLong (Jan 13)
- Re: fixing insecure email infrastructure (was: Re: [eweek article] Window of "anonym Valdis . Kletnieks (Jan 13)
- Re: fixing insecure email infrastructure (was: Re: [eweek article] Window of "anonym Steven Champeon (Jan 13)
- Re: fixing insecure email infrastructure (was: Re: [eweek article] Window of "anonym Stephane Bortzmeyer (Jan 13)
- /24 route propagation, how long is reasonable? Michael Airhart (Jan 13)
- Re: /24 route propagation, how long is reasonable? bmanning (Jan 13)
- Re: /24 route propagation, how long is reasonable? Jon Lewis (Jan 13)