Constraints on TTLs

Chris Hastie <[email protected]>
Newsgroups gmane.network.dns.bind9.dlz
Message-ID <[email protected]>
After making some changes to my DNS this afternoon one host started
being reported as NXDOMAIN, despite the fact that the records clearly
remained. Logs indicated

"dns_sdlz_putrr returned error. Error code was: bad ttl"

After staring for hours at the data and being unable to spot the problem
I removed all RRs for the host (there were four of them) and began
reinserting them.

The errors reappeared when I inserted an MX record with TTL of 86400.
Reducing this to 3600 solved the problem. The TTL of the target of the
MX record is 3600, as is the TTL of the host's other MX record. Is there
some constraint on the TTLs of MX records?

-- 
Chris Hastie

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