Don’t automatically include all subdomains in DNSMasq address

dnsmasqdomain-name-systeminternal-dns

It is possible to configure DNSMasq such that it returns a fixed IP address only for a request for that exact domain, and not for its subdomains? That is, I want it to return a fixed IP when resolving example.com, but not a.example.com, b.example.com, etc.

Best Answer

host-record=example.com,1.2.3.4

The dnsmasq man page says:

--host-record=<name>[,<name>....][<IPv4-address>],[<IPv6-address>]
Add A, AAAA and PTR records to the DNS. This adds one or more names to the DNS with associated IPv4 (A) and IPv6 (AAAA) records. A name may appear in more than one host-record and therefore be assigned more than one address. Only the first address creates a PTR record linking the address to the name. This is the same rule as is used reading hosts-files. host-record options are considered to be read before host-files, so a name appearing there inhibits PTR-record creation if it appears in hosts-file also. Unlike hosts-files, names are not expanded, even when expand-hosts is in effect. Short and long names may appear in the same host-record, eg. --host-record=laptop,laptop.thekelleys.org,192.168.0.1,1234::100

Related Solutions

Dnsmasq resolves local hostname to 127.0.0.1 all over the net

Normally, you would define your static hosts in /etc/hosts and enable hosts in your dnsmasq.conf file. dnsmasq allows you to specify an alternate name for this file.

If you want rtfm.lan to be addressed as 192.168.1.2 then add a line reading 192.168.1.2 rtfm.lan to /etc/hosts. Normally, your hosts file for dnsmasq should be portable to all your servers.

On rtfm.lan the IP stack will short-circuit the routing and not send traffic onto the network.

If you update your /etc/hosts file and signal dnsmasq with a HUP signal, the hosts file will be reread and changes applied.

EDIT: dnsmasq is not designed to serve up a dynamic host address for its own host. As noted it does serve up names from its lease file for DHCP clients.

If your host is an Internet gateway, it would normally serve a local static address. Serving up the Internet gateway address may cause routing and firewall issues.

You could configure your DHCP client to write a one line hosts file. The dnsmasq option addn-host can be used to get dnsmasq to read this file in addition to /etc/hosts. If the address is likely to change, then the DHCP client could rewrite the file and send dnsmasq a HUP signal on IP address change.

Redirect all DNS-Requests with dnsmasq

Yes!

I use it this way:

/usr/local/sbin/dnsmasq -z -k -2 -i vlan9 -a 10.6.66.1 \
--address=/\#/10.6.66.1

10.6.66.1 is the IP address it returns.

UPDATE Yes, # is a wildcard. You can specify multiple with --address

Best Answer

Related Solutions

Dnsmasq resolves local hostname to 127.0.0.1 all over the net

Redirect all DNS-Requests with dnsmasq

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