DNS confusion (mine!)
Mark_Andrews at isc.org
Mark_Andrews at isc.org
Tue Jul 29 00:12:29 UTC 2003
> This issue is driving me and a few users nuts & I was hoping somebody could
> help me out. I'm having a few problems with DNS for float.com.au and
> ipo-australia.com
>
> On Monday 21 July I moved float.com.au and ipo-australia.com to a server at
> linode.com . I also started using using www.zoneedit.com for DNS. The DNS
> should have resolved by now but some ISPs seem to be resolving to the old
> address.
>
> The new IP address I was given by linode.com works http://64.5.53.79/
>
> A traceroute of float.com.au from the University of Queensland
> http://www.questnet.net.au/cgi-bin/nph-tr1.cgi seems to be working:
> traceroute to float.com.au (64.5.53.79) from 130.102.5.50, 30 hops max, 40
> byte packets
> 1 mr2fw-a5 (130.102.5.30) 1.553 ms (ttl=64) 1.068 ms (ttl=64) 1.097 ms
> (ttl=64)
> ... (intermediate steps deleted)
> 20 li-79.members.linode.com (64.5.53.79) 214.269 ms (ttl=45) 215.121 ms
> (ttl=45) 214.742 ms (ttl=45)
>
>
> But a traceroute from Telstra
> http://tcruskit.telstra.net/cgi-bin/trace?float.com.au resolves to the old
> address:
> traceroute to float.com.au (64.247.30.103), 30 hops max, 40 byte packets
> 1 FastEthernet6-0.civ-service1.Canberra.telstra.net (203.50.1.65) 0.391
> ms 0.436 ms 0.429 ms
> ... (intermediate steps deleted)
> 15 64.247.30.103 (64.247.30.103) 292.62 ms 292.844 ms 293.351 ms
>
> I'm no DNS expoert so could somebody point out what could be wrong?
> Thanks,
> G. Toomey
Ensure that the *old* nameservers have the *new* zone content
or that the old servers are no longer serving the zone.
The best strategy is to make them serve the new content
until all NS records refering to them have expired then to
remove the zone.
You can get "server lock" if you don't do this.
"Server lock" is where the cache re-learns the old NS RRset
every time it makes a query to the old servers resetting
the TTL. If it continues to make queries before the NS
RRset expires it will never go to the parent zone.
Making the old servers serve the new content forces the
cache to learn the new RRset. Just decommisioning the old
servers make the zone lame for that cache until the NS RRset
expires.
Mark
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark.Andrews at isc.org
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