Zitat von "W.C.A. Wijngaards" <[email protected]>:
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Hi Andreas,
On 11/03/2010 09:07 AM, [email protected] wrote:
It seems more that unbound and bind disagree in their opinion if the
signature is expired or not. As said the time unbound starts failing the
same queries done directly to the upstream resolve *and* validate fine.
So the options are:
That is strange. Your clocks are synchronised, so that is not it.
Could it have been the recent daylight-savings change somehow?
Both bind and unbound may have some leeway for expired signatures that
you can configure; val-sig-skew-max and val-sig-skew-min config options
for unbound.
- Bind does not send the same data it is using for validation to the
downtsream (unbound) client. Would be a Bind bug i guess.
Try doing a dig @<bind> name +dnssec and then with +dnssec +cdflag. If
that is different, then this is happening.
- Unbound and Bind do validation different (should not happen IMHO)
Yes.
- Validation in Unbound for some cases is broken. Would be a bug in
Unbound i guess.
Well, when unbound refuses to validate it, enable val-log-level: 2, and
take a look in the log file, it gives a detailed error. Then dig
+dnssec and dig +dnssec +cdflag when it mentions (also to the unbound so
see what is in the cache, and also at the IP address it mentions).
If you enable val-log-level: 2 (and you can have verbosity low), it
gives one line per validation failure. This is a (relatively) low
amount of logging, but very useful, as it tells you why exactly unbound
failed the query.
It would be nice to get help how to debug this as DNSSEC "by-hand" is
somewhat challenging.
This is pretty easy, the RRSIG notes ....
RRSIG bla bla expiration inception bla bla.
They are in yyyymmddhhmmss format UTC.
Most signers leave a couple weeks headroom in the expiration date.
I will try to capture the follwoing:
- Logging from unbound as suggested
- dig from both as the error happens
- Packet dump from unbound <--> bind communication over the wire
May i send this to you in private to not clutter the list with attachments?
Thanks for your help
Andreas
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