A question about using forwarders.

[raghavendra.sadaramachandra at wipro.com]

Hi,
 Plz use following configuration to get reply from any one out of 2 ip
addresses configured. In named.conf file.

options {
        directory "/var/named";

        forward only;

        forwarders {
		IP1;
		IP2;
        };
};

Here it first tries to contact IP1 and if IP1 fails to reply it contacts
IP2.


Plz look at the following also.

options {
        directory "/var/named";

        // The "forward" option is only meaningful if you've defined
        // forwarders.  "first" gives the normal BIND
        // forwarding behavior, i.e. ask the forwarders first, and if
that
        // doesn't work then do the full lookup.  You can also say
        // "forward only;" which is what used to be specified with
        // "slave" or "options forward-only".  "only" will never attempt
        // a full lookup; only the forwarders will be used.
        forward first;
        forwarders {
                1.2.3.4;
                5.6.7.8;
        };

};

Regards,
Raghavendra. S

-----Original Message-----
From: bind-users-bounce at isc.org [mailto:bind-users-bounce at isc.org] On
Behalf Of Lee Fu-yuan
Sent: Thursday, December 08, 2005 11:28 AM
To: bind-users at isc.org
Cc: leefy at csie.nctu.edu.tw
Subject: A question about using forwarders.

Hi everyone,

I have a question about the usage of the forwarder options.
Consider a simple setting:

	options {
		....
		....
		forwarders {IP_ADDRESS1; IP_ADDRESS2;};
		....
	};

Is it possbile that we can ask the DNS server to query the
second forwarder with IP_ADDRESS2 if the first forwarder
answers our query with NXDOMAIN message?


Similarly, if none of the forwarders have the answer, i.e.,
they all answers NXDOMAIN, can we let the DNS server perform
interative query from root DNS servers?

Thanks a lot.

With best regards,


--
Lee, Fu-Yuan
Distributed System and Network Security Lab.
Dept. of Comp. Sci. & Info. Eng
Nat'l Chiao Tung Univ.
Hsinchu, Taiwan 30050, ROC
E-Mail: leefy at csie.nctu.edu.tw




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