On Tue, Aug 25, 2015 at 12:50 AM, Reindl Harald <h.rei...@thelounge.net> wrote:
> > > 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 > Only authoritative negative responses are cached. SERVFAILs are never authoritative, by definition. -- Kevin Oberman, Network Engineer, Retired E-mail: rkober...@gmail.com PGP Fingerprint: D03FB98AFA78E3B78C1694B318AB39EF1B055683
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