<quote who="Bill Taylor">
> Question is, have I missed something in all this; do I need a modem that
> will run from an ethernet card in order to set up a seperator between my
> home/office network and the internet, or can it be done with a dial-up
> serial modem? And have access to the internet from the intranet?
To Linux, the modem's interface is the same kind of thing as an ethernet
interface; a modem pops up as ppp0, whilst an ethernet card pops up as eth0.
They'll both have IP addresses and subnets.
pppd (the userspace daemon that operates ppp over the serial line) tells a
bunch of scripts in /etc/ppp/ what its IP address is, and other details, so
you can launch firewall scripts that base their rules on this dynamic
information (generally you'll be getting a dynamic IP address with home
dial-up accounts).
I've found that the fastest way to provide IP masquerading for a small
network is to use the 'ipmasq' package in Debian. It will ask if you want to
run it when a ppp interface comes up, and will do all of the work for you,
using sensible rules to begin with which you can extend if you want.
- Jeff
--
"Trying to get a PC to analyse one of the most abstract forms of
language - the poem - is like trying to drill for oil with a banana."
- The Register
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