Hi there,

I'd like to tunnel my Internet connection to a second PC using a serial line connection (using XBee radio modules).

Something like this:
eth0(host1) <-> XBee(1) <-> ... ... <-> XBee(2) <-> eth0(host2)

I managed to setup a serial connection between the two PCs - that works fine. But how can I transmit "The Internet" over this line?

Do I need PPP, SLIP, slattach, ...?

cheers,
T.

You should read the serial HOWTO and other related HOWTO's from http://www.tldp.org

Or I could ask a question in teh linuxquestions.org - and hope for a non bullshit reply. Unlike teh yours


From what I think how it should work:
Server:
modprobe slip
slattach -L -s 115200 -p slip /dev/ttys0 &
ifconfig sl0 172.16.0.1 dstaddr 172.16.0.2
echo 1 > /proc/sys/net/ipv4/conf/eth0/forwarding
iptables -t nat -A POSTROUTING -s 172.16.0.2 -o eth0 -j MASQUERADE

Client:
modprobe slip
slattach -L -s 115200 -p slip /dev/ttys0 &
ifconfig sl0 172.16.0.2 dstaddr 172.16.0.1
ip route add default via 172.16.0.1 dev sl0
echo nameserver 8.8.8.8 > /etc/resolv.conf

... problem is: it does not work Ping timeouts ...

The documentation is a bit old but you would want to set up a ppp connection over a serial cable (or null modem). SLIP would also work. Technically it would be just:

host-2 -> ppp via Xbee -> host-1 -> eth0

In a nutshell you would configure iptables for NAT between the serial port (ppp0) and eth0 for host-1