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
How are Negative responses usually cached?
Thanks
Harshith
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