Hey,

Most probably this is already discussed several times, but I wasn't able to find any user friendly manuals on how to create some sort of network, which would mean that one computer (Lubuntu in this case) is connecting to internet through second PC (Ubuntu), which is directly connected to cable, so maybe you could help me out with some manuals and tips.

The computer which is connected to internet have two LAN cards (Realtek 8139 and integrated nVidia MCP65), Realtek card is connected to the internet provider cable (internet is tied to my computer's MAC address and uses static IP).

Second computer have also a Realtek card and it's connected to first computers integrated card.

Anyhow - I've put on the first computer eth1 (which is integrated MCP65) IPV4 setting to "Shared to Other Computers" and IPV6 to "Link-Local Computers" and while I was having Windows XP on the second machine, setting on it (the XP machine) DHCP (or how was it correctly called, when system automatically resolves or gets the IP and the rest what it needs?), second computer was receiving Internet signal and I could use both of them in such way.

Now the second computer is with Lubuntu and I thought that I could do the same way as did on XP - just put in Network Manager for the connection (eth0) everything to automatical and there will be internet, but there aren't and the manager shows some kind of "Automatic Ethernet" option, which after activation also doesn't do anything.

So my question in short would be: What do I have to do, to make my Lubuntu machine to recognize Ubuntu's eth1 and to use it as a source for Internet?

I wouldn't mind if someone would at least tell me how to correctly Google or search on LinuxQuestions forum for tips and How-To's!

Thanks in advance!

I think this is a duplicate post, I read it earlier this week...

From the terminal of your ubuntu computer (the one connected to the internet) would you please run these commands and post the output to this forum.

That could be so, that it's already discussed before - it's just that I'm not that good at specific thing (like this one) searching. Also, I thought that if WinXP with dhcp could easily connect to internet through Ubuntu, so [easily] should do another Ubuntu system!

zivs@ubunts:~$ ifconfig

zivs@ubunts:~$ ip route
zivs@ubunts:~$ ps aux | grep dhcp

I need that one.

Can you run them all from the other ubuntu computer as well please?

Also on the other computer (without the internet), run

iptables-save went with no messages, so I assumed that it's not needed to post that. Will check now the other computer!

Here are the results:
ilga@lubunts:~$ sudo dhclient

Please run all of these commands on the second computer.
And please run from the first computer, and post anything that comes up

Here's everything from the second computer (the one with no internet)

ilga@lubunts:~$ sudo iptables-save
ilga@lubunts:~$


ilga@lubunts:~$ ifconfig

ilga@lubunts:~$ ip route
ilga@lubunts:~$



ilga@lubunts:~$ ps aux | grep dhcp


ilga@lubunts:~$ ping 10.42.45.1 -c 3
And here's from the computer with internet:

zivs@ubunts:~$ sudo iptables-save

From the computer with the internet connection, please run this command:Then, from your second computer please run
And post the output.

----

If that does NOT work please setup a static IP address for your second computer, in the 10.42.45.0/24 network.
IP address: 10.42.45.100
Subnetmask: 255.255.255.0
Default Gateway: 10.42.45.1
Use your ISP's DNS server.

Once you have set that, ping 10.42.45.1 from the second computer. If that works, ping 203.0.178.191 as well.

---
Please also do this from the main ubuntu computer and post the output:

Tried/did all the commands You told me to do, but still no results - no connection on second computer ..

Here's the info from second computer:
ilga@lubunts:~$ sudo dhclient
Also, pinging 10.42.45.1 ended with Network is unreachable message ..

And here's from main computer:
zivs@ubunts:~$ ip route

zivs@ubunts:~$ ps aux | grep dhcp

zivs@ubunts:~$ cat /etc/resolv.conf

zivs@ubunts:~$ cat /proc/sys/net/ipv4/ip_forward

Yay. The ping didn't work because for some reason your ubuntu box changed it's internal IP address from 10.42.45.1 to 10.42.43.1

The reason that DHCP did not work earlier is that you were blocking it from your firewall. Either add the iptables command I gave you earlier to your firewall script, or stick at the end of rc.local (or something similar.)

Set the lubuntu computer back to DHCP, and try to use the internet.

Good luck!

1 members found this post helpful.

Thanks,SuperJediWombat! - after adding that iptables command on my Ubuntu machine and then running dhclient command on the other computer (Also, putting IPv4 to Automatic and IPv6 to Link-Local Only), I've finally got the Internet on both machines!

Only thing which I noticed just now was that in Network-Manager on Lubuntu computer wasn't written Mac address (which I copied out from ifconfig's info) ... I wonder if that missing Mac address there was also playing any role in this case?

Once again - huge thanks for putting so much effort in finding the problem for me!

No problem, I'm glad we got it sorted. Where did those iptables rules come from by the way? Did you set them up manually, or are they part of the Ubuntu network sharing system?

I haven't touched them before (if only Firestarter after installation (don't know why I had it installed) rewrote something?), so I guess that's part of Ubuntu's system.