caching of "server fail" BIND9
Len Conrad
LConrad at Go2France.com
Tue Aug 24 14:49:28 UTC 2010
We just had a problem where a BIND9 running on our postfix MX 451-rejected-as-unknown-domain all msgs from @sender.domain for 9 days.
"rndc flush" allowed the domain to be resolved immediately and its messages accepted.
When the BIND reports "server fail", rather than a negative answer with neg-TTL, how long is SRV FAIL cached in BIND9? RFC2308 says "no longer than 5 minutes".
We do not know whether unknown domain's NS was really SRV FAIL for 9 days.
Len
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