Negative Caching TTL

Jim McAtee jmcatee at mediaodyssey.com
Tue Dec 16 21:20:08 UTC 2003


Can someone explain to me how to best use negative caching TTL.  It's not
clear to me if setting this value in the SOA record affects how our BIND
9.2.3 servers answer queries, or if the value is open to interpretation by
the receiving DNS client.

$TTL 1d
@ IN SOA ns1.modyssey.net. admin.modyssey.net. (
                2003101701  ; serial
                4h          ; refresh
                30m         ; retry
                14d         ; expire
                15m       ) ; negative ttl

With the above, will older BIND servers see the default TTL for records as 1
day or 15 minutes?




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