Am 25.08.2015 um 12:46 schrieb Harshith Mulky:
I have a confusion on how the clients respond to and cache when
particularly we receive negative replies from a DNS Server, particularly
NXDOMAIN or SERVFAIL responses
on the DNS Zone file we have these records
$ORIGIN e164.arpa.
@ IN SOA picardvm2.e164.arpa. e164-contacts.e164.arpa. (
2002022404 ; serial
3H ; refresh
15 ; retry
1w ; expire
*3h* ; minimum
)
so 3h is basically the amount of time clients are asked to cache
negative results.
Now on the client side at lwresd.conf, if I have
max-ncache-ttl 300
Will the client override the default 3h value sent as response from the
DNS Sever for the zone e164.arpa
yes, that's the purpose of this setting
How are Negative responses usually cached?
by TTL while in case of a SERVFAIL i am not sure if it get cached
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