DNS cache problem

[Michael Kjorling]

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I get the new IP (I assume, it's not 64.241.222.34 at least):

> zyvex.com.		172800	IN	NS	DFWNS1.AIRBAND.NET.
> zyvex.com.		172800	IN	NS	DFWNS2.AIRBAND.NET.
> ;; Received 118 bytes from 192.42.93.30#53(G.GTLD-SERVERS.NET) in 261 ms
>
> zyric.zyvex.com.	86400	IN	A	216.138.97.43
> zyvex.com.		86400	IN	NS	dfwns1.airband.net.
> zyvex.com.		86400	IN	NS	dfwns2.airband.net.
> ;; Received 143 bytes from 206.50.26.195#53(DFWNS1.AIRBAND.NET) in 181 ms

Probably just a caching issue. Depending on how things were set up
before it may take a while before it times out.

And if the SOA record was corrupt, why was the zone even loaded? And
no, the SOA record does not specify the cache time; that is a property
of each individual RRset. The SOA record's last field is the
_negative_ TTL.


Michael Kjörling


On Dec 3 2001 15:40 -0600, Mike Weller wrote:

> Before the change, I polled a dozen nameservers around the world
> for zyric.zyvex.com:
> nslookup zyric.zyvex.com  140.221.9.6
> nslookup zyric.zyvex.com 141.217.90.3
> nslookup zyric.zyvex.com 141.217.1.13
> nslookup zyric.zyvex.com 141.217.1.15
> nslookup zyric.zyvex.com 206.191.74.19
> nslookup zyric.zyvex.com 24.226.1.11
>
> The change was made at 12pm cst today (Monday).
> 3 hours later, all nameservers still report the old IP
> (64.241.222.34), despite the minimum TTL of 1 hour.
>
> My question to you DNS experts is, if an SOA record is corrupt (and
> thus, can't read the cache time) how long does the nameserver cache
> IPs for?  Is there a way to poll "bind" to determine what the
> cache times are for any particular IP or domain?
>
> I hope it's not too long, because our current ISP is about to drop
> our service!
>
> Thanks for any help you can provide.
>
> -Mike

- -- 
Michael Kjörling  --  Programmer/Network administrator  ^..^
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"There is something to be said about not trying to be glamorous
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(Joyce Sequichie Hifler, September 13 2001, www.hifler.com)
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