> I don't believe there is a delegation problem:
>
> ns1/ns2.isp.net - which hosts isp.net and customers
> dns1/dns2.isp.net - which hosts customers only
>
> what do you think?


Since you haven't given specific examples I won't guess.
You have enough information to work this out yourself.

Mark

> Mark Andrews wrote:
> >> FORMERR is strange. Generally speaking, you should not be seeing FORMERR
> >> in queries between 2 different BIND instances.
> >>
> >> It's looking increasingly to me like a bad NAT/PAT device, mangling your
> >> packets. Maybe it doesn't understand EDNS0 (?) My next step would
> >> probably be to run a packet trace/capture, although, on the off-chance
> >> that it's EDNS0-related, you might try turning that off and see if it
> >> makes a difference.
> >>
> >>
> >> - Kevin
> >>

> >
> > Named logs FORMERR when it receives a unexpected SOA record
> > on a response.
> >
> > If you delegate to foo.example.net and the nameserver has
> > their own copy of example.net rather than foo.example.net
> > you will get a unexpected SOA records in the negative
> > response.
> >
> > Below is a example of such a bad delegation. The last SOA
> > record should be owned by www.lawlink.nsw.gov.au not
> > lawlink.nsw.gov.au. It results in SERVFAIL being returned.
> >
> > Mark
> >
> >
> > ; <<>> DiG 9.3.4-P1 <<>> aaaa www.lawlink.nsw.gov.au
> > ;; global options: printcmd
> > ;; Got answer:
> > ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 56606
> > ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
> >
> > ;; QUESTION SECTION:
> > ;www.lawlink.nsw.gov.au. IN AAAA
> >
> > ;; Query time: 63 msec
> > ;; SERVER: 127.0.0.1#53(127.0.0.1)
> > ;; WHEN: Fri Sep 5 12:01:30 2008
> > ;; MSG SIZE rcvd: 40
> >
> > ; <<>> DiG 9.3.4-P1 <<>> www.lawlink.nsw.gov.au aaaa +trace
> > ;; global options: printcmd
> > . 440024 IN NS h.root-servers.net.
> > . 440024 IN NS d.root-servers.net.
> > . 440024 IN NS g.root-servers.net.
> > . 440024 IN NS i.root-servers.net.
> > . 440024 IN NS b.root-servers.net.
> > . 440024 IN NS l.root-servers.net.
> > . 440024 IN NS m.root-servers.net.
> > . 440024 IN NS e.root-servers.net.
> > . 440024 IN NS f.root-servers.net.
> > . 440024 IN NS a.root-servers.net.
> > . 440024 IN NS j.root-servers.net.
> > . 440024 IN NS c.root-servers.net.
> > . 440024 IN NS k.root-servers.net.
> > ;; Received 504 bytes from 127.0.0.1#53(127.0.0.1) in 3 ms
> >
> > au. 172800 IN NS ns1.audns.net.au.
> > au. 172800 IN NS dns1.telstra.net.
> > au. 172800 IN NS sec1.apnic.net.
> > au. 172800 IN NS sec3.apnic.net.
> > au. 172800 IN NS adns1.berkeley.edu.
> > au. 172800 IN NS adns2.berkeley.edu.
> > au. 172800 IN NS audns.optus.net.
> > au. 172800 IN NS aunic.aunic.net.
> > ;; Received 430 bytes from 2001:500:1::803f:235#53(h.root-servers.net) in 2

> 44 ms
> >
> > lawlink.nsw.gov.au. 3600 IN NS ns3.uecomm.net.au.
> > lawlink.nsw.gov.au. 3600 IN NS ns1.uecomm.net.au.
> > lawlink.nsw.gov.au. 3600 IN NS ns2.uecomm.net.au.
> > ;; Received 105 bytes from 58.65.255.73#53(ns1.audns.net.au) in 42 ms
> >
> > www.lawlink.nsw.gov.au. 3600 IN NS ns1.lawlink.nsw.gov.au.
> > www.lawlink.nsw.gov.au. 3600 IN NS ns2.lawlink.nsw.gov.au.
> > ;; Received 108 bytes from 203.94.128.54#53(ns1.uecomm.net.au) in 39 ms
> >
> > lawlink.nsw.gov.au. 86400 IN SOA lawlink.nsw.gov.au. administrat

> or.lawlink.nsw.gov.au. 998545544 28800 7200 604800 86400
> > ;; Received 144 bytes from 203.3.186.53#53(ns1.lawlink.nsw.gov.au) in 32 ms

--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark_Andrews@isc.org