[TriLUG] use fedora server for VPN

[matt at noway2.thruhere.net]

It's been mentioned in Alan's blog, but it bears worth repeating:

iptables -t nat -A POSTROUTING -o <iface> -j MASQUERADE
and
echo "1" > /proc/sys/net/ipv4/ip_forward

are, in my humble opinion, two of the most powerful commands in all of
Linux and will allow you to bridge a wide variety of network interfaces.

When I bought my phone, they (wrongfully) told me that it would not work
with Linux.  Then when we wanted a wireless credit card machine to use in
places like craft fairs they (wrongfully) told us that the only way would
could do that would be to buy one that cost several thousand dollars more
(and that the one we bought could never be used in these places). 
Combining Linux, the phone, a cross over cable with those two commands and
the impossible became possible.

> i think i found my error:
>
> [option8 at pogo ~]# cat /proc/sys/net/ipv4/ip_forward
> 0
>
>
> i've fixed with sysctl, so now ip_forward is 1, and it looks like it works
> now. (based on connecting to the internet via my phone's wifi tether and
> hitting ipchicken.com :)
>
> thanks for the pointers, all.
>