nanog mailing list archives
Re: looking for hostname router identifier validation
From: Paul Ebersman <list-nanog2 () dragon net>
Date: Mon, 29 Apr 2019 15:22:16 -0600
ekuhnke> I would caution against putting much faith in the validity of ekuhnke> geolocation or site ID by reverse DNS PTR records. There are a ekuhnke> vast number of unmaintained, ancient, stale, erroneous or ekuhnke> wildly wrong PTR records out there. I can name at least a half ekuhnke> dozen ISPs that have absorbed other ASes, some of those which ekuhnke> also acquired other ASes earlier in their history, forming a ekuhnke> turducken of obsolete PTR records that has things with ISP ekuhnke> domain names last in use in the year 2002. That's because the version of perl required to run the perl script that creates the ascii text PTR zone file is 4.x. perhaps? :) bryan> I still see references to UUNet in some reverse PTRs. bryan> So, uh, yeah. The uu.net PTRs should mostly have been service machines, like ns.uu.net, auth00.ns.uu.net (which horrifyingly do still resolve). Routers should have been in alter.net, which I do still see in traceroutes.
Current thread:
- looking for hostname router identifier validation Matthew Luckie (Apr 29)
- Re: looking for hostname router identifier validation Eric Kuhnke (Apr 29)
- Re: looking for hostname router identifier validation Bryan Holloway (Apr 29)
- Re: looking for hostname router identifier validation Paul Ebersman (Apr 29)
- Re: looking for hostname router identifier validation Valdis Klētnieks (Apr 29)
- Re: looking for hostname router identifier validation Chris Adams (Apr 29)
- Re: looking for hostname router identifier validation Large Hadron Collider (Apr 29)
- Re: looking for hostname router identifier validation Julien Goodwin (Apr 30)
- Re: looking for hostname router identifier validation Bryan Holloway (Apr 30)
- Re: looking for hostname router identifier validation Large Hadron Collider (Apr 30)
- Re: looking for hostname router identifier validation Bryan Holloway (Apr 29)
- Re: looking for hostname router identifier validation Eric Kuhnke (Apr 29)
- Re: looking for hostname router identifier validation Bryan Holloway (Apr 30)
- Re: looking for hostname router identifier validation Patrick W. Gilmore (Apr 30)