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Date:      Sun, 22 Jul 2001 11:07:13 +0200
From:      Len Conrad <LConrad@Go2France.com>
To:        freebsd-questions@freebsd.org
Subject:   Re: dns
Message-ID:  <5.1.0.14.0.20010722105449.0333e008@mail.Go2France.com>
In-Reply-To: <F283KfreeJa2ygErNaw00002ce9@hotmail.com>

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>how can i have to 2 ips resolve from one domain name ?

here are some examples:

dig aol.com mx

dig hotmail.com mx

dig microsoft.com mx

When a hostname has identical fields for network class and Rtype, the group 
of records is call an RRset.  BIND treats the set as indivisible, and will 
answer  queries with the entire set.   The RRset-order option defines the 
physical order of the set members in an answer.  The default order is 
cyclic. You can see these params either globally for alll zones in the 
named.conf options sections, or per-zone in the zone statements.

This is a load-distribution technique, not load balancing.

see

http://www.isc.org/products/BIND/docs/config/

Note that the BIND resolver will, in the case of NS records, also play a 
role in that it will lock onto the NS that has the lowest RTT, round trip 
time, while continuing to query all the NSīs in the NS RRSet to check their 
RTTīs.

Len


http://MenAndMice.com/DNS-training
http://BIND8NT.MEIway.com : ISC BIND 8.2.4 for NT4 & W2K
http://IMGate.MEIway.com  : Build free, hi-perf, anti-abuse mail gateways


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