A very Odd SOA Problem

[Mark Andrews]

In message <201103150326.p2F3QDFo049101 at x.it.okstate.edu>, Martin McCormick wri
tes:
> 	We just moved one of our remote campuses to new IPv4
> number space and I was having tremendous problems all day using
> nsupdate. I thought it was because the change of DNS address had
> not gone through yet, but it had and a whois lookup shows the
> correct DNS addresses.
> 
> 	When I finally debugged an nsupdate attempt, I see what
> is happening but I am not sure why. 
> 
> Found zone name: 253.112.64.IN-ADDR.ARPa
> The master is: ns.osuit.edu
> Sending update to 164.112.255.20#53
> 
> That's our problem. A SOA query seems to be returning
> 164.112.255.20 but the proper address is 64.112.255.20
> 
> I thought I had fat-fingered an entry in the zone for osuit.edu,
> but if you query it for the SOA record, you get:
> 
> osuit.edu.		43200	IN	SOA	ns.osuit.edu. lisa.garrison.oks
> tate.edu. 2222908 3600 900 608400 30
> 
> osuit.edu.		22697	IN	NS	ns2.osuit.edu.
> osuit.edu.		22697	IN	NS	ns.osuit.edu.
> 
> ns.osuit.edu.		7956	IN	A	64.112.255.20
> ns2.osuit.edu.		22697	IN	A	64.112.255.21
> 
> Those addresses are correct and the whois data base was updated
> today with the same addresses.
> 
> Name Servers:
>    NS.OSUIT.EDU       64.112.255.20
>    NS2.OSUIT.EDU      64.112.255.21
> 
> I've been fighting this all day and have run out of ideas.

nsupdate calls getaddrinfo() which uses /etc/hosts, NIS and DNS.
Check /etc/hosts and NIS.
 
> 	Any ideas as to why the address is changing? I even did
> a recursive grep on the master for 164.112.255 and didn't find a
> thing matching that.
> 
> thanks for any suggestions. this totally breaks nsupdate unless
> you force the server and zone information.
> 
> Martin McCormick WB5AGZ  Stillwater, OK 
> Systems Engineer
> OSU Information Technology Department Telecommunications Services Group
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org