[Dibbler] Problems with the FQDN-Snapshot

ml2h2 at web.de ml2h2 at web.de
Thu Aug 31 13:27:40 CEST 2006


> -----Ursprüngliche Nachricht-----
> Von: Tomasz Mrugalski <tomasz.mrugalski at klub.com.pl>, Dibbler users list <dibbler at klub.com.pl>
> Gesendet: 31.08.06 12:49:43
> An: Dibbler users list <dibbler at klub.com.pl>
> Betreff: Re: [Dibbler] Problems with the FQDN-Snapshot


> On Thu, 31 Aug 2006 somebody known as ml2h2 at web.de wrote:
> 
> > I tried dibbler 0.5.0-RC1 and still FQDN doesn't work in our lab.
> >
> > I start dibbler client after dibbler server. As soon as a clients sends 
> >a dhcpv6 request the server stops with following message:
> >> <Server Debug     FQDN: Performing DNS Update: Only PTR record.
> Before Dibbler client (or server) attempts to perform DNS Update, it 
> prints what DNS server address it will use. Make sure that you are able to 
> ping that DNS server. When there is no routing configured, Dibbler might 
> get stuck in TCP retransmissions.
> 

all clients can ping the server

> > Perhaps this help you:
> > I tried to isolate the error and I found out that the server stops in 
> >file IfaceMgr/DNSUpdate.cpp (line 289 after: if (a->RCODE != 
> >RCODE_NOERROR)).
> 
> Wow, nice! With this kind of bug report, I think I will be able to 
> fix this quickly. Today in the evening, perhaps.

I'll do my best ;-)
 
> Nevertheless, dibbler will only better handle this error condition, but it 
> will try to print what went wrong.
> 
> As a quick workaround, you can add following line at the beginning of the 
> get_oldDnsRR() method in IfaceMgr/DNSUpdate.cpp:272:
> 
> return 0;
> 
> It will skip part of the code, where dibbler tries to obtain old DNS 
> records. The next step, which dibbler does is to perform actual update. I 
> think it will fail too (as for some reason communication with DNS server 
> failing), but this time it will print, what went wrong.

I changed the file and now I see that dibbler wants to make a zone transfer. Why? Per default it is disabeled in our network because of security reasons.

Here are the last output lines (server):

------------------------------------------------------------------------------------------

0733s,849819us  Server Debug     FQDN: Performing DNS Update: Only PTR record.
0733s,850638us  Server Debug     FQDN: PTR record created: 9.f.2.4.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.3.1.c.d.c.8.3.c.1.4.b.d.f.ip6.arpa -> ipv6nr02.ip6.lab
0733s,851678us  Server Debug     FQDN: stl-03.
0733s,927495us  Server Error     FQDN: Nameserver is not authoritative for this zone (NOTAUTH)
0733s,927761us  Server Warning   FQDN: DNS Update failed: server is not not authoritative.
0733s,928084us  Server Debug     FQDN: Performing DNS Update: Only AAAA record.
0733s,928241us  Server Debug     FQDN: stl-11.
0733s,928347us  Server Debug     FQDN: stl-12.
0733s,928586us  Server Debug     FQDN: AAAA record created:ipv6nr02.ip6.lab. -> fdb4:1c38:cdc1:3000::42f9
0733s,931779us  Server Error     FQDN: Error not specified (SRVFAIL)
0733s,932026us  Server Warning   FQDN: DNS Update failed: server is not not authoritative.
0733s,932407us  Server Notice    Sending REPLY on eth1/5,transID=0x3b2a43, opts: 1 3 34 2 23 24, 0 relay(s).
0733s,935618us  Server Notice    Accepting connections. Next event in 60 second(s).
0744s,913970us  Server Debug     Received 96 bytes on interface eth1/5 (socket=5, addr=fe80::290:27ff:fe1a:937.).
0744s,914573us  Server Notice    Received RELEASE on eth1/5,TransID=0x9dded0, 3 opts: 2 1 3, 0 relay(s).
0744s,914779us  Server Debug     1 answers buffered. Old reply for transID=9dded0 not found. Generating new answer.
0744s,915094us  Server Notice    FQDN: Attempting to clean up AAAA and PTR record in DNS Server fdb4:1c38:cdc1:1000:230:5ff:fe01:8e60, IP = fdb4:1c38:cdc1:3000::42f9 and FQDN=ipv6nr02.ip6.lab
0744s,915569us  Server Debug     FQDN: Performing DNS Cleanup: Only AAAA record.
0744s,916070us  Server Debug     FQDN: stl-11.
0744s,916225us  Server Debug     FQDN: stl-12.
0744s,916486us  Server Debug     FQDN: AAAA record created:ipv6nr02.ip6.lab. -> fdb4:1c38:cdc1:3000::42f9
0744s,919068us  Server Error     FQDN: Error not specified (SRVFAIL)
0744s,919315us  Server Warning   FQDN: DNS Update failed.
0744s,919444us  Server Notice    FQDN: Attempting to clean up PTR record in DNS Server fdb4:1c38:cdc1:1000:230:5ff:fe01:8e60, IP = fdb4:1c38:cdc1:3000::42f9 and FQDN=ipv6nr02.ip6.lab
0744s,919912us  Server Debug     FQDN: Performing DNS Cleanup: Only PTR record.
0744s,920070us  Server Debug     FQDN: stl-11.
0744s,920177us  Server Debug     FQDN: stl-12.
0744s,920462us  Server Debug     FQDN: PTR record created: 9.f.2.4.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.3.1.c.d.c.8.3.c.1.4.b.d.f.ip6.arpa -> ipv6nr02.ip6.lab
0744s,924087us  Server Error     FQDN: Nameserver is not authoritative for this zone (NOTAUTH)
0744s,924346us  Server Warning   FQDN: DNS Update failed: server is not not authoritative.
0744s,924569us  Server Debug     Cache: Entry for client (DUID=00:01:00:00:44:f6:89:cd:00:90:27:1a:09:37:00:00:00:00:00:00) was deleted.
0744s,924794us  Server Debug     Cache: Address fdb4:1c38:cdc1:3000::42f9 added for client (DUID=00:01:00:00:44:f6:89:cd:00:90:27:1a:09:37:00:00:00:00:00:00).
0744s,925013us  Server Debug     Deleted address fdb4:1c38:cdc1:3000::42f9 from addrDB.
0744s,925170us  Server Debug     Deleted IA (IAID=1) from addrDB.
0744s,925305us  Server Debug     Deleted client (DUID=00:01:00:00:44:f6:89:cd:00:90:27:1a:09:37:00:00:00:00:00:00) from addrDB.
0744s,925515us  Server Debug     Address usage for class 0 decreased by 1.
0744s,925714us  Server Notice    Sending REPLY on eth1/5,transID=0x9dded0, opts: 2 1 13, 0 relay(s).
0744s,928406us  Server Notice    Accepting connections. Next event in 49 second(s).

------------------------------------------------------------------------------------------


> Thanks for pointing that out. I also look forward for information if this 
> workaround helped or not.

here it is

Ciao

Heiko Reints

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