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Internet Connection Sharing in Ubuntu 9.10

I am totally new to Linux.
I was not able to connect to internet using the default network manager in Ubuntu, so I set up the internet connection using "sudo pppoeconf" and it works great.
I want to share this internet connection with another PC which runs Windows XP. Please, can anybody give me step by step instructions about how to do that? (instructions for configuring both Ubuntu and windows machine, A GUI will be very helpful)
Both my Ubuntu machine and windows PC have static IP. And I dont want anyone to use this internet connection except the windows PC. Please, help..

Quote:

Originally Posted by pranavk_uict (Post 3868928)

I am totally new to Linux.
I want to share this internet connection with another PC which runs Windows XP. Please, can anybody give me step by step instructions about how to do that? (instructions for configuring both Ubuntu and windows machine, A GUI will be very helpful)

GUI is hell :-P It's much more simple to do it in console :-)
Read this nice chapter # 14.2.1, especially its last part: http://slackbook.org/html/security-h...-HOST-IPTABLES

ps: ask, if you'll still have any linuxquestions. :-)
ps2: there is no /etc/rc.d/rc.inet2 in Ubuntu. So, you need to write that 2 lines of commands in some start script, to execute them automatically at each boot.