Debian – DNS Server with dnsmasq

debiandnsmasqdomain-name-systemnetworking

I'm trying to set up dnsmasq as a dns server on a virtual machine running Debian. I can successfully run nslookup from another computer: nslookup facebook.com 10.0.11.2 and the answer I get is:

Server:        10.0.11.2
Address:       10.0.11.2#53

Non-authoritative answer:
Name:    facebook.com
Address: 173.252.110.27

Now when I do a lookup for a local address such as nslookup router.domain.com 10.0.11.2 and the answer I get is ;; connection timed out; no servers could be reached

(However on the actual dns server, running a traceroute uses "router.domain.com" rather than its IP address)

My dnsmasq.conf contains:

address=/router.domain.com/10.0.11.2
no-resolv
server=8.8.8.8
server=8.8.4.4

and my resolv.conf contains:

nameserver 127.0.0.1
search domain.com

What might the problem be?

Cheers

Best Answer

So, the line in your config file:

no-resolv

tells dnsmasq to ignore the contents of your resolv.conf file. Perhaps you should comment that line out?

There's a pretty good article at: http://wiki.debian.org/HowTo/dnsmasq#Local_Caching that describes this.

Related Solutions

DNSMasq – Setting Up DNSMasq for a Local Network

Refer to the DNSmasq documentation, especially the dnsmasq manpage and sample configuration file. The local keyword tells DNSmasq to perform those domain lookups with local data. This affects requests send to DNSmasq for foo.localnet and bar.localnet, for example. I don't think this is what you want.

# Add local-only domains here, queries in these domains are answered
# from /etc/hosts or DHCP only.
local=/localnet/

To force host/subdomain lookups to resolve to a specific address, you'd probably want to use the address keyword. The second example below should allow web1.devbox and web2.devbox and web73872.devbox to all resolve to the address specified.

# Add domains which you want to force to an IP address here.
# The example below send any host in doubleclick.net to a local
# webserver.
address=/doubleclick.net/127.0.0.1

# for your example
address=/devbox/192.168.3.99

I use DNSmasq at home to handle simple DNS stuff for my LAN; in that case, local and the associated domain and expand-hosts keywords are appropriate. The DNSmasq server is my primary nameserver, so all requests go through it; any nonlocal addresses are passed back to the ISP's nameserver. You might consider that configuration if possible.

MS DNS lookup issue

It all looks perfrectly normal to me. The name servers for iis.se are ns.nic.se, ns2.nic.se, and ns3.nic.se.

You get the Server Unknown message because you don't have a PTR zone set up on your DNS servers for your subnet (which isn't required). When you run nslookup from the DNS server the DNS client on the server (which is what nslookup uses, as the DNS server is also a DNS client and operates as any other DNS client does) first performs a PTR lookup to find the name of the server configured in the DNS settings of the TCP\IP protocol bound to the NIC. Not finding a PTR record, nslookup responds with Server Unknown. This is perfectly normal and acceptable.

Next you issue the query for www.iis.se and get a response from one of the name servers at iis.se from both the IPv6 and IPv4 addresses of that name server, that it can't find a record for www.iis.se. This is a perfectly normal response if no record for www exists.

You do that two more times against two different name servers and get the same response, which again is perfectly normal where no record for www.iis.se can be found.

You do that a third time on a server that has 127.0.0.1 configured as it's DNS server in the TCP\IP protocol settings of the NIC and get a request timed out, which tells me that the DNS client is pointing to 127.0.0.1 for DNS but that the DNS server (if you're running this particular nslookup from the DNS server) isn't listening on 127.0.0.1 so the query times out.

Try running nslookup against each of the name servers for the iis.se domain and query each one for www and see what they answer.

Best Answer

Related Solutions

DNSMasq – Setting Up DNSMasq for a Local Network

MS DNS lookup issue

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