[Dnsmasq-discuss] local domain added when forwarding to upstream DNS servers

[Lixus Zoran]

Hi Tom,

> And that isn't followed by a query for www.cnn.com?

Sorry, I do not understand this question. I did a "nslookup www.cnn.com"
and I saw in the tcp capture that this got translated to www.cnn.com.mydomain.tld

> What if you 1. query www.cnn.com. (note the trailing period) or 2.
> eliminate the "search mycompany.tld" line from /etc/resolv.conf?

Does not help, see 5) for details. This reflects the current situation:

mydesktop:~/# dnsmasq --version
Dnsmasq version 2.45  Copyright (C) 2000-2008 Simon Kelley

mydesktop:~# /etc/init.d/nscd stop

mydesktop:~# /etc/init.d/dnsmasq restart
Restarting DNS forwarder and DHCP server: dnsmasq.

mydesktop:~# cat /etc/dnsmasq.conf | grep -v ^# | grep -v "^ *$"
resolv-file=/etc/resolvconf/resolv.conf.d/upstream
server=/mycompany.tld/10.0.0.1

mydesktop:~# cat /etc/resolv.conf 
nameserver 127.0.0.1

( i removed the "search mydomain.tld" line )


mydesktop:~# cat /etc/resolvconf/resolv.conf.d/upstream 
nameserver 85.214.73.63

1) checking for a hostname in my domain without domainname
===========================================================
mydesktop:~# nslookup myfileserver
Server:         127.0.0.1
Address:        127.0.0.1#53
** server can't find myfileserver: REFUSED

mydesktop:~# tshark -i br0 port 53
Capturing on br0
-> no dns querie is send out

Of course this did not work since i removed the "search mydomain.tld"
from /etc/resolve.conf and the host is not listed in /etc/hosts

2) checking for a hostname in my domain with domainname
=========================================================
mydesktop:~# nslookup myfileserver.mycompany.tld
Server:         127.0.0.1
Address:        127.0.0.1#53

Name:   myfileserver.mycompany.tld
Address: 10.0.0.86

mydesktop:~# tshark -i br0 port 53
Capturing on br0
  0.000000  10.0.0.43 -> 10.0.0.1    DNS Standard query A myfileserver.mycompany.tld
  0.000283    10.0.0.1 -> 10.0.0.43  DNS Standard query response A 10.0.0.86

Works as expected.


3) checking for lists.thekelleys.org.uk
=======================================
mydesktop:~# nslookup lists.thekelleys.org.uk
Server:         127.0.0.1
Address:        127.0.0.1#53
** server can't find lists.thekelleys.org.uk: REFUSED

mydesktop:~# tshark -i br0 port 53
Capturing on br0
-> no outgoing DNS querie captured

That is surprising me, this querie not even gets forwarded to the upsteam server.

4) checking for lists.thekelleys.org.uk. with a dot at the end
==============================================================
mydesktop:~# nslookup lists.thekelleys.org.uk.
Server:         127.0.0.1
Address:        127.0.0.1#53
** server can't find lists.thekelleys.org.uk: REFUSED

mydesktop:~# tshark -i br0 port 53
Capturing on br0
-> no outgoing DNS querie captured

Same here, dnsmasq is not even forwarding to the upsteam server

5) checking the responsiness of the upsteam server
==================================================
mydesktop:~# nslookup 
> server 85.214.73.63
Default server: 85.214.73.63
Address: 85.214.73.63#53
> lists.thekelleys.org.uk
Server:         85.214.73.63
Address:        85.214.73.63#53

Non-authoritative answer:
lists.thekelleys.org.uk canonical name = thekelleys.org.uk.
Name:   thekelleys.org.uk
Address: 86.9.119.69