LinuxQuestions.org - [SOLVED] DNS server issue resolving localdomain hosts

- Linux - Server (https://www.linuxquestions.org/questions/linux-server-73/)

- - DNS server issue resolving localdomain hosts (https://www.linuxquestions.org/questions/linux-server-73/dns-server-issue-resolving-localdomain-hosts-775454/)

DNS server issue resolving localdomain hosts

I have dnsmasq setup for my network, the server it runs on is configured like this:

/etc/resolv.conf

Code:

domain localdomain

search localdomain

nameserver=127.0.0.1

/etc/hosts

Code:

127.0.0.1      localhost

127.0.1.1      server

192.168.1.1    server

192.168.1.51    host1

192.168.1.52    host2

192.168.1.53    host3

.....

192.168.2.1    modem

/etc/dnsmasq.conf (eth1 is my external interface)

Code:

domain-needed

bogus-priv

filterwin2k

except-interface=eth1

resolv-file=/etc/resolv.openDNS

log-queries

log-facility=/var/log/dnsmasq

/etc/resolv.openDNS

Code:

search localdomain

nameserver 208.67.222.222

nameserver 208.67.220.220

The server uses itself to look up addresses, dnsmasq is configured to use a different resolv file than the default.

So whether the query comes from the network or the server dnsmasq will be doing all the work and using OpenDNS to resolve it, then it will cache the result.

The problem is when the server tries to resolve hosts on the local domain. In my log file I see this:

Quote:

Dec 14 13:01:01 dnsmasq[13229]: query[AAAA] server.localdomain from 127.0.0.1
Dec 14 13:01:01 dnsmasq[13229]: forwarded server.localdomain to 208.67.222.222

From the documentation I have read about dnsmasq it should look up the cache first, then the /etc/hosts file next, then the DHCP leases file and lastly it should query the external dns server.

My question is, how do I stop dnsmasq forwarding the query's for the localdomain to the external server and resolve them itself?

I found part of the solution:

/etc/dnsmasq.conf

Quote:

local=localdomain

That stops the forwarding of the query to the external dns servers but the dnsmasq server still does not resolve the internal hosts like it should.

Quote:

Originally Posted by hazza96 (Post 3792664)

Nobody can help?

Strangely I did not see your thread in the "Quick links"->"View new posts" list and have just posted an almost identical question in this LQ thread.

Alright thanks, I can't help that guy but I fixed my problem:

/etc/dnsmasq.conf

Quote:

expand-hosts
domain=localdomain

Now the hosts on the network can ping the local hosts and dnsmasq resolves them fine. The log entry looks like this:

Quote:

Dec 16 06:46:32 dnsmasq[12167]: query[A] host1.localdomain from 192.168.1.97
Dec 16 06:46:32 dnsmasq[12167]: /etc/hosts host1.localdomain is 192.168.1.51

Here is my entire dnsmasq.conf that solved the problem, just in case someone wants it in the future:

/etc/dnsmasq.conf

Quote:

domain-needed
bogus-priv
filterwin2k
except-interface=eth1
resolv-file=/etc/resolv.openDNS
expand-hosts
local=localdomain
domain=localdomain
log-queries
log-facility=/var/log/dnsmasq

The last 2 lines are optional and only required if you want to log what dnsmasq is doing.