[ale] VPN / NAT question from meeting

[glallen01 at gmail.com (George Allen)]

So, there was a question about sharing a VPN connection with a LAN
through NAT. I believe something like this should work:

echo "1" > /proc/sys/net/ipv4/ip_forward
iptables -A FORWARD -i eth0 -d 10.0.0.0/8 -j ACCEPT
iptables -t nat -A POSTROUTING -o tun0 -j MASQUERADE
sysctl net.netfilter.nf_conntrack_acct=1

as referenced here: http://www.bloovis.com/wordpress/?p=219

/break/

I haven't read through it all, but this looks interesting, with regard
to building one's own tunnel:
http://www.mad-hacking.net/documentation/linux/networking/ipsec/nat-vpn.xml

Also, the Linux HOWTOs are kindof dated, but they're still good
reading and reference:
http://www.tldp.org/HOWTO/VPN-Masquerade-HOWTO.html
http://www.tldp.org/HOWTO/NET3-4-HOWTO.html
http://www.tldp.org/HOWTO/Networking-Overview-HOWTO.html

Hope this helps,
-George