DHCP gateway and Firefox proxy

[asmo.koskinen at arkki.info]

> But where is possible to set the gateway assigned by DHCP?

I think, it is something like this way.

"Finally, dhcp-option sets the third (3) DHCP option, which sets the
default route, pointing to 192.168.0.1 as the router."

http://www.techrepublic.com/blog/opensource/using-dnsmasq-for-dns-and-dhcp-services/293

"By default dnsmasq assumes that host running dnsmasq is your
gateway/router. That wasn’t the case in my network so I needed to specify
the IP address of my Cisco gateway/router in the following line:

dhcp-option=3,192.168.10.1"

http://www.iceflatline.com/2010/02/how-to-install-and-configure-dnsmasq/

> Is it possible to set the proxy on Firefox for all users?

Here is something.

https://help.ubuntu.com/community/FirefoxMandatoryPreferences
http://askubuntu.com/questions/23117/configuring-firefox-to-use-a-proxy-from-the-command-line
http://www.linuxjournal.com/content/lock-firefox-6-prefs-also-versions-3-4-5

Best Regards Asmo Koskinen.