hello ,
i have a computer that is connected to the internet with usb - ppp0 ( usb -> dsl modem ) , and now i want to share that connection with my laptop .
i have ethernet cards on both computers and i was wondering how to connect them . ( i know i have to use NAT and set default gateways ) but i cant get it to work .
Thank you very much

Why don't you tell us what you've already done. Remember that you must enable IP forwarding on the computer with the Internet connection. Also, make sure your firewall is not blocking things. (Check the FORWARD chain.)

This is what i have done so far :
$>echo "1" > /proc/sys/net/ipv4/ip_forward

i have two interfaces : ppp0 which is connected to the internet and eth0
$>iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE

for my other computers , the default gateway is my eth0 .
im not sure if i have all the needed modules loaded , can u plz list them . I havnt changed anything in my iptables . Can you also tell me what i have to add there ?

thank you very much for the help

Thank you.

You also need to make sure the other computers have correct values for the DNS servers. The easiest thing (with just a few computers) is to set these to the same values as your gateway machine (the one with the DSL connection). There is probably a way to do this with GUIs. Or it might just be easier to copy the /etc/resolv.conf file from your gateway machine to each of the other machines (must be done as root).

If/when you have DNS set up correctly, if it still doesn't work, please post the results of:

(The iptables command must be run as root. Any user may run the route command.)


I have never explicitly loaded modules for this. (Some are automatically loaded as a result of iptables commands.) For some purposes you may need to explicitly load some modules, but for simple browsing you shouldn't need to.