Well,
Changing linux machine into a router is very easy
Compile the Linux kernel with option CONFIG_IP_ROUTER
I guess when you run make config ...there is an option
on the lines ..
Do you want to allow IP_FORWARDING between the n/w
say Yes to this .....
All the settings can be done in TCP/IP section of
' make config'
After that setting proper attributes for Net interfaces as
Subnet Mask ... default gateway (using ifconfig etc.)
you can configure it to be a router.
Srikant
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