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03-11-2004 09:16 AM
03-11-2004 09:16 AM
is it possible to put as forwarders
3 DNS IP addresses from the ISP
at named.conf from BIND 9
by "forward only" server ?
regards
chris
Solved! Go to Solution.
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03-11-2004 10:23 AM
03-11-2004 10:23 AM
Re: question about BIND 9
options {
forwarders {
ip.ad.on.e;
ip.ad.tw.o;
ip.ad.thr.ee;
};
};
should do it.
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03-11-2004 10:37 AM
03-11-2004 10:37 AM
Re: question about BIND 9
not so clearly.
I know how to put to named.conf
my collegue says by "forward only" DNS server
I cannot put more than 2 IP addresses.
and only by "resolver" I can put more than 2.
is it true ?
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03-11-2004 11:08 AM
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03-28-2004 09:53 AM
03-28-2004 09:53 AM
Re: question about BIND 9
I did a test with a resolver:
# cat /etc/resolv.conf
nameserver 192.168.5.1
nameserver 192.168.5.2
nameserver 192.168.5.3
nameserver 192.168.5.4
# ping something
# tcpdump -nl port 53
tcpdump: listening on eth0
00:45:06.365654 192.168.1.1.32841 > 192.168.5.1.53: 51545+ A? something. (27) (DF)
00:45:11.375117 192.168.1.1.32842 > 192.168.5.2.53: 51545+ A? something. (27) (DF)
00:45:14.385090 192.168.1.1.32843 > 192.168.5.3.53: 51545+ A? something. (27) (DF)
00:45:20.395042 192.168.1.1.32841 > 192.168.5.1.53: 51545+ A? something. (27) (DF)
00:45:25.405048 192.168.1.1.32842 > 192.168.5.2.53: 51545+ A? something. (27) (DF)
00:45:28.415041 192.168.1.1.32843 > 192.168.5.3.53: 51545+ A? something. (27) (DF)
how you can see the nameserver 192.168.5.4
will NOT be asked.
so by resolver will be limited up to 3 nameserver.
greetings
chris
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03-28-2004 10:46 AM
03-28-2004 10:46 AM
Re: question about BIND 9
"man resolv.conf" produces this:
... Up to MAXNS (see
"grep MAXNS /usr/include/resolv.h" returns:
#define MAXNS 3
So you are absolutely correct.
In the configuration you are listing however, this is querying (up to MAXNS)remote name servers, not using forwarders in a BIND configuration.