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Re: Broken reverse DNS for 207.8.214.5

2003-11-23 11:00:02

| Looks like the new server for listbox does not have a proper reverse
| dns resolution !!

yeah, thanks for the note.  leave a PTR record out for five minutes and
everybody negative-caches it for who knows how long.

24 hours, to be exact (86400 seconds). See http://www.dnsstuff.com/tools/lookup.ch?name=124.65.216.in-addr.arpa&type=SOA . maxim.net has the reverse DNS entries for 216.65.124.0/24 set to have a 24-hour negative TTL. So if the PTR record is removed for 5 minutes, any DNS server that accesses the PTR record during those 5 minutes will see no reverse DNS entry for 24 hours. To shorten it, the MINIMUM value in the SOA record for 124.65.216.in-addr.arpa needs to be set to a lower value.
                                  -Scott

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