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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