nslookup tries only first dns in resolv.conf

4 msg	Dump DLZ Entries to File?
10 msg	Multiple CNAMEs - howto?
4 msg	mail record problem
2 msg	Couldn't resolve certain major sites
5 msg	NS hosed! Please Advise
2 msg	Problem configuring NAPTR with BIND
8 msg	setting up dns on solaris
7 msg	nsupdate: A records (glue) in reverse zones
5 msg	rndc-confgen just hangs
2 msg	One slave tried to notify another slave after r...
4 msg	DDNS client: Multiple zone entries
11 msg	have DNS show two IP's for one server
1 msg	How to Set Timeout For Resolving Names?
2 msg	BIND 9 - Reverse lookups made by SMTP servers fail

nslookup tries only first dns in resolv.conf
\ linuxnewbie1234 (23 Oct 2006)
. \ Barry Margolin (24 Oct 2006)
. \ Kevin Darcy (24 Oct 2006)
. \ base60 (24 Oct 2006)

4 msg	Is it possible to specify a fallback NS?
3 msg	help with T_ANY
3 msg	BIND 9 crapping out at 510 MB
10 msg	What qualfies a namespace?
5 msg	Problems transferring zones with TSIG.

Subject:	nslookup tries only first dns in resolv.conf
Group:	Bind-users
From:	linuxnewbie1234
Date:	23 Oct 2006

Hi all, not sure it's the right NG but...

We have an internal network of linux computers, with an internal DNS to
resolve internal names, then we have two external DNSs to resolve
external names.
So in the internal computers, resolv.conf contains 3 entries.

Now, internal linux machines query only the FIRST dns server written in
resolv.conf, failing to resolve SOME(*) external names.

Question: why don't these machines try the other DNSs in resolv.conf?
And: what is the proper configuration to make the thing work?

TIA
(*) for a reason not exactly known to me right now, the internal DNS is
capable to resolve also many external names, that's why many external
names are anyway resolved by the internal computers.