As i test it's not cached at all, and you say here it's cached for 30 seconds?! i'm using 9.7.2-P3.
2011/9/27 Evan Hunt <e...@isc.org> > > I discover that servfail are not cached. is it normal? > > Yes, that's normal. > > Temporary negative caching of SERVFAIL responses for a limited period (up > to 30 seconds, if I recall correctly) is permitted by the DNS protocol, > and we've discussed implementing it in BIND9, but haven't had time yet. > > -- > Evan Hunt -- e...@isc.org > Internet Systems Consortium, Inc. >
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