Jared Stafford wrote:
I've got an ADSL router from 2wire that does not do proper DNS
masqerading, so I installed Dnsmasq. However, I still wanted to use the
router as the gateway. Dnsmasq did not have an option to do this, so I
created one. Right now, it just uses a global option to set the real
router address, any suggestions on how to improve it?
It's possible to do this without patching. The code you found calculates
a default value for the router address. The only place that value is
used is as DHCP option 3, in DHCP replies.
If you add the following to dnsmasq.conf
dhcp-option=3,<router address>
then dnsmasq will send the given address, instead of the default it
calculated, as option 3. (See rfc2132 for the option numbers in DHCP
messages)
This method also enables different router addresses for different
subnets or even different hosts, by using network-tags.
It's worth studying the example configuration file supplied with
dnsmasq, that covers a lot of these situations.
Cheers,
Simon.
