Internet Connection Sharing Documentation

[deeflex]

This guide DO work in 9.10 as well now.

I had to confirm that the setup was correct, so I tried to share in Windows, which worked. Then I switched back to Ubuntu and also eth0/eth1, not sure if it had anything to do with it, but that's what I tried in Windows.

Now it works!!!

In the guide it says
"For this example, eth0 is the network card on the client which is connected (by crossover cable) to eth1"

a crossover cable is NOT needed here.

[alexisespinosa]

I am having problems to share my internet connection to windows vista using the network manager.
I have Ubuntu 9.10 installed and a computer with two network cards. I'm trying to share internet from this computer to a laptop with windows vista.

I tried using the Network Manager wtih the option "shared to other computers" for eth1, but windows vista is not optaining a IP automatically, so the internet is not shared. The only thing I get in windows vista, after typing ipconfig is: ip 169.254.157.158 and subnet mask 255.255.0.0, gateway and DNS fields appear empty.

Is this a problem of the Network Manager? Should I uninstall it and install the gnome version? How can I do that?

Is this a problem of windows vista? How can I fix it?

I know that there is an option of configuring a fixed ip by editing the interfaces, sysctl.conf and the rc.local, but I want to try the "shared to other computers" option in the network manager first.

Thanks a lot,
Alexis

[Selmi]

...
I tried using the Network Manager wtih the option "shared to other computers" for eth1, but windows vista is not optaining a IP automatically, so the internet is not shared. The only thing I get in windows vista, after typing ipconfig is: ip 169.254.157.158 and subnet mask 255.255.0.0, gateway and DNS fields appear empty.

Is this a problem of the Network Manager? Should I uninstall it and install the gnome version? How can I do that?
...

you have to update network manager with version taken from here: https://launchpad.net/~network-manager. version in official repository behaves exactly as you wrote. temprary workaround is that you can disable and enable connection in network manager and refresh network settings on windows side, but you have to do this after every restart....

[dmizer]

I am having problems to share my internet connection to windows vista using the network manager.
I have Ubuntu 9.10 installed and a computer with two network cards. I'm trying to share internet from this computer to a laptop with windows vista.

I tried using the Network Manager wtih the option "shared to other computers" for eth1, but windows vista is not optaining a IP automatically, so the internet is not shared. The only thing I get in windows vista, after typing ipconfig is: ip 169.254.157.158 and subnet mask 255.255.0.0, gateway and DNS fields appear empty.

Is this a problem of the Network Manager? Should I uninstall it and install the gnome version? How can I do that?

Is this a problem of windows vista? How can I fix it?

I know that there is an option of configuring a fixed ip by editing the interfaces, sysctl.conf and the rc.local, but I want to try the "shared to other computers" option in the network manager first.

Thanks a lot,
Alexis

No, this is not a problem at all. You will need to manually enter the DNS servers (this is typical of ICS connections). If you don't know any DNS servers to use, you can use opendns servers: http://www.opendns.com/

If you still can't connect, then add the gateway. The gateway will be your Ubuntu PCs IP. It's probably 192.168.157.1, but check ifconfig in Ubuntu to make sure.

[dbclinton]

Hi,
I'm trying to share an Internet connection between Lucid computers and I'm having no luck so far. I'm using the "Ubuntu Internet Gateway Method (iptables)" (https://help.ubuntu.com/community/In...nectionSharing) although I configured the clients through NetworkManager rather than Terminal. Here are my settings (ifconfig on the clients confirms them):

address 192.168.0.100 (or .101)
broadcast 255.255.255.0
gateway 192.168.0.254 (which is my server's internal NIC address).

My server accesses the internet via a proxy and I've configured the clients to use that proxy.
I know my server is configured properly because, for one session, I actually got access from one client - but I lost it when I rebooted because some other DHCP server (probably my own server which is also a thin client server) took control of it and assigned it different IPs. By the time I had figured out how to force control away from the DHCP server and keep the client's fixed address, I had somehow lost Internet.
I will add that I definitely have network connectivity - I can use VNC from my server to view and use the clients' desktops.
Any ideas about what I'm doing wrong?
Thanks.

UPDATE:
I'm not quite sure how, but the network is now up and running - perhaps it had something to do with the fact that I redid the configuration on my server just to make sure.

FURTHER UPDATE:
The problem was that the iptables rules I set on the server (see https://help.ubuntu.com/community/In...nectionSharing) weren't surviving reboots and had to be saved. For information on how to do that, see the "Saving iptables" section from https://help.ubuntu.com/community/In...nectionSharing

[crazycaveman]

I had noticed that the iptables needed to be saved as well and just added them. Hopefully it will help people in the future. Other than that, the guide seems really good.

[drofmij]

for gui method at: https://help.ubuntu.com/community/In...nectionSharing

does this work in 10.04? or 10.10?

I am trying to find a simple way to share my wired internet connection to wireless devices (ie creating a software wap with my wifi card) but haven't found an easy guide for this. Firestarter appears to be able to configure it, but it does not work just following the wizard.

any suggestions?

Thanks,
Jim

[dmizer]

for gui method at: https://help.ubuntu.com/community/In...nectionSharing

does this work in 10.04? or 10.10?

I am trying to find a simple way to share my wired internet connection to wireless devices (ie creating a software wap with my wifi card) but haven't found an easy guide for this. Firestarter appears to be able to configure it, but it does not work just following the wizard.

any suggestions?

Thanks,
Jim

Yes, the simple click GUI method works perfectly in all versions beyond 9.10. However, you need to be aware that your wireless card may or may not support ad-hoc networking. If you are having problems, it could simply mean that your wireless card is not capable of this.

If you need further help, you'll be better off creating a thread in the Networking and Wireless section of the forums.

[ganyx]

I am building a local network with 4 nodes behind a switch and 1 node connect with two network interfaces.

Following this instruction, I still can not ping the ip outside from the nodes behind the switch.

My local network is 192.168.1.x, the server has two network interfaces,
eth0 pointed to switch to other nodes
eth1 pointed to the internet

From the frond node connect to internet directly

:~$ sudo iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain FORWARD (policy DROP)
target     prot opt source               destination         
ACCEPT     all  --  192.168.1.0/24       anywhere            ctstate NEW 
ACCEPT     all  --  anywhere             anywhere            ctstate RELATED,ESTABLISHED 

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

And

~$ route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
localnet        *               255.255.255.0   U     0      0        0 eth1
192.168.1.0     *               255.255.255.0   U     0      0        0 eth0
link-local      *               255.255.0.0     U     1000   0        0 eth0
default         129.78.142.254  0.0.0.0         UG    100    0        0 eth1

Any one can help me on solving this problem? Thanks!


Added 18.10:

This is solved.
At Front Node, edit file /etc/rc.local by adding one line

/sbin/iptables -t nat -A POSTROUTING -s 192.168.1.0/24 -o eth1 -j MASQUERADE

[-genin-]

hi...

I read help.ubuntu.com/community/Internet/ConnectionSharing

then I do all steps but the iptables...
this is my iptables...

sudo iptables -A FORWARD -o eth0 -i eth0 -m mac --mac-source 00:23:a4:5a:ee:67 -m conntrack --ctstate NEW -j ACCEPT
sudo iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
sudo iptables -A POSTROUTING -t nat -j MASQUERADE

I just want that mac address only can use my ICS... but, everyone can use my ICS...

any idea??

*I use 1 nic...