Hi Hans.
Based on what you described, it sounds like DNS queries you issue to
your server (using dig) are processed by one view for loopback addresses
and a different view for eno1 addresses? If that is the case it would be
interesting to see how the (same) zone is defined in those two views?
And which of these views is the one that is being updated by nsupdate?
Depending how the views are defined it could also make a difference
whether you include +recurse or +norecurse in your dig queries.
I'd suggest you set up query logging, and then do some testing and watch
the logs to confirm if this is the case? FYI In case it helps, this is
the logging that I use:
logging {
category default { syslog; logfile; default_debug; server_log;
};
category dnssec { syslog; logfile; default_debug; };
category lame-servers { syslog; logfile; default_debug; };
category queries { syslog; logfile; default_debug; query_log;
};
category query-errors { syslog; logfile; default_debug; query_log;
};
category resolver { syslog; logfile; default_debug; };
category rpz { syslog; logfile; default_debug; query_log;
};
category rpz-passthru { syslog; logfile; default_debug; query_log;
};
category unmatched { logfile; };
channel syslog {
syslog daemon;
severity notice;
};
channel logfile {
file "/var/log/named/all.log" versions 5 size 10m;
print-time yes;
print-category yes;
print-severity yes;
severity info;
};
channel query_log {
file "/var/log/named/query.log" versions 5 size 10m;
print-time yes;
print-category yes;
severity info;
};
channel server_log {
file "/var/log/named/server.log" versions 5 size 10m;
print-time yes;
print-category yes;
severity info;
};
};
On the assumption my theory is correct, the most likely explanation for
what you're describing is that records are being cached in some views,
which is why you aren't getting the latest results for those views. How
long a record is cached is based on TTL parameters in the zone.
Depending on the types of updates you are doing (with nsupdate) you
might like to consider using a shorter TTL value on either individual
records or all records, and/or the negative response caching TTL (5th
parameter in the SOA record)?
Nick.
On 3/11/2024 11:28 pm, Hans Mayer via bind-users wrote:
Dear All,
I am running BIND 9.18.32-dev (Extended Support Version) <id:a3b61ad>
running on Linux x86_64 6.1.0-25-amd64 #1 SMP PREEMPT_DYNAMIC Debian
6.1.106-3 (2024-08-26)
This server has several interfaces based on docker but in general a
physical interface "eno1" and a loopback interface "lo".
Both interfaces have each an IPv4 and an IPv6 address. So in total 4
combinations.
The named service has several dynamic zones as master in three
different views. The server does also inline-signing for some zones.
There is also RPZ in use to rewrite some queries.
Most of the time I get on all 4 IP address the same answer for the
serial number doing a dig for a specific domain name and SOA record.
Doing a dynamic update for a signed master zone with "nsupdate" I have
the situation that I get from IP "127.0.0.1" and "::1" an increased
serial number but on real interface "eno1" with IPv4 and IPv6 the old
serial number.
The interesting part is doing a zone-transfer with "dig axfr" from a
remote server and therefore to the real interface "eno1" I get the
updated serial number. Therefore all secondary DNS servers are getting
the updates. Also a "dig" for the SOA RR from remote gives the updated
information.
In my mind came, maybe there is an other DNS service running on the
same machine. Checking the daemon log shows that bind has no error at
start and is listening on all interface. To be sure I stopped "named"
and without named I didn't get any answer at all on all interfaces.
Therefore it is "named" which gives different answers on different
interfaces.
A "rndc reload" doesn't help but after some time ( long time ) the
serial numbers on all interfaces are identical.
The same with restarting the named process, it doesn't help.
Finally I assumed it has something to do with DNSSEC. I realized that
validation for all views was disabled after reboot. So I run "rndc
validation on".
In the first moment it looks fine. All serial numbers identical. But
doing an update again, the serial numbers are different. So maybe it
was a coincidence that it changed in that moment.
Any ideas where I can look deeper into this issue ? Any help would be
appreciated.
Kind regards
Hans
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