[Dnsmasq-discuss] allowing interface names as parameters to 'alias' option

[dnsmasq at lists.bod.org]

Quick suggestion: how hard would it be to enhance the 'alias' option to 
understand interface names, as well as IP addresses? In other words, be 
able to write something like:

    alias = eth0, br0

or

    alias = eth0, 192.168.1.10

instead of

    alias = 86.30.247.112, 192.168.1.10

This would be particularly useful if it could transparently cope with an 
interface's IP address changing, e.g. a WAN interface with a dynamic IP 
address.

Some background: I run a few services on my server at home (e.g. 
asterisk) where latency matters. The rest is hosted, along with my DNS 
records. Without an 'alias' line like those above, DNS lookups will 
return the public IP address of my router to my LAN clients too, and so 
they'll send all the traffic through the router.

While that's rather inefficient (routing traffic between two nodes on 
the same Gb network through a soho router), it also means that ports I 
purposely don't forward from the public internet also don't get 
forwarded for LAN clients.

Luckily I'm running custom router firmware and have a static IP, so I'm 
able to add that line manually to dnsmasq.conf on the router. But it'd 
be nice if distributions could incorporate something like this as 
standard, to compliment port forwarding/'DMZ server'-type features.

Just a thought,

- Paul

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