Will MX lookup ignore MX on server which also has NS delegation.

Paul Vixie Paul_Vixie at isc.org
Fri May 30 00:41:38 UTC 2008

Barry Margolin <barmar at alum.mit.edu> writes:

> If they're running BIND it should ignore the MX and A records in the 
> parent zone because of the delegation.  But I believe there are other 
> DNS implementations that do not do this.

BIND or no BIND, once the NS RRs get out, the parent's not going to get
any more MX or A queries from that cache, for the domain in question.
Paul Vixie

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