Ubuntu 12.04 ICS how to properly share internet?

Question

Computer networks

I have a pc with freshly installed ubuntu 12.04. I want to make a gateway out of it.
After installation I put all updates.
Further, everything is strictly according to the manual (Ubuntu Internet Gateway Method (iptables) section)
I do not set dnsmasq, I prescribe ip, gateway, mask and dns with my hands.
The maximum that works is ping to the gateway, everything else does not work.
Can someone tell me something or give a link to a step-by-step man?
PS. Forgot about
eth0 interfaces looks to the
eth1 provider in the ppp0
locale the Internet itself

Answer 1

If you are doing it for the first time and it is not clear where the error is, then I would advise you to go incrementally. 2 commands are enough to fulfill your goals for now:
$ echo 1 > /proc/sys/net/ipv4/ip_forward
and
$ iptables -A FORWARD -j ACCEPT
Yes, I forgot about iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE

Answer 2

In NetworkManager, select your eth1, "Change", "IPv4 Settings" and in "Configuration Method" select "Share the network with other computers". Everything.

Answer 3

Who taught you to write such headings for questions? Just so that people come in for the sake of interest to find out what you want to ask?

Answer 4

If this is not a home server, it is better to look towards web-proxy (squid).