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Old 12-15-2006, 03:05 PM   #1
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BIND 9.3.3 split dns recursion disallow

Hi guys,

I'm setting up split views (internal/external) on BIND 9.3.3. I allow recursion for my internal clients (ie. office, branches, etc..) but disallow recursion for external. Doing a MX query from the outside with nslookup on a windows box against my domain doesn't show anything but it's completely fine with linux. Weird. Is this a nslookup bug on windows? If I allow recursion for my external view, then nslookup on windows works! However, I don't want to allow recursion for the external view but I'm afraid that exchange servers from other companies won't be able to deliver mail to mine.

Any ideas? Anyone have this issue?

Old 12-15-2006, 04:23 PM   #2
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You should probably post your named.conf as well as the results of nslookup from Windows & dig from Linux (both external). There are way too many variables that could cause the results to be different for anyone to give an anwer based on what you've provided so far.
Old 12-15-2006, 06:12 PM   #3
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I modified the configs to no longer use split dns as I thought that could be the issue. However, it's not and the result is the same. Below is named.conf:

options {
        directory "/etc";
        query-source address * port 53;
        pid-file "/var/run/";
        statistics-file "/var/run/named.stats";
        zone-statistics yes;
        //allow-recursion { "corp_internal"; };
        recursion no;

include "security.conf";
include "master.conf";
include "arpa.conf";

// Cache Zone
zone "." {
        type hint;
        file "named.root";
Here is my master.conf:
//Zone files go here

zone "" {
              type master;
              file "master/";
Below is the lookup from a windows machine hitting the external ip address of the nameserver:
C:\Documents and Settings\bob>nslookup
Default Server:

> server <outside ip address>
Default Server:  [outside ip address]
Address:  <outside ip address>

> set q=mx
Server:  [outside ip address]
Address:  <outside ip address nameserver = nameserver =    internet address =   internet address =
Now, here is nslookup from a linux workstation:
[root@dev01 ~]# nslookup
> server <outside ip address>
Default server: <outside ip address>
Address: <outside ip address>#53
> set q=mx
Server:         <outside ip address>
Address:        <outside ip address>#53        mail exchanger = 5
Both the linux workstation and the windows workstation are on the same network (same vlan). It's completely weird that nslookup on linux works fine but not on windows. Running dig on linux shows a successful result as well.


Last edited by twantrd; 12-15-2006 at 06:14 PM.


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