A very Odd SOA Problem
Mark Andrews
marka at isc.org
Tue Mar 15 04:25:05 UTC 2011
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
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