Internet Connection Sharing in ubuntu

E

etherion

Active Member
Joined
Dec 13, 2011
Messages
38
Hi Guys
I've having trouble setting up an ICS with my other computer.
I've followed the instructions @ https://help.ubuntu.com/community/Internet/ConnectionSharing but still no luck.
I'm using /etc/network/interface to handle my connection so i used the Ubuntu Internet Gateway Method (iptables)
wlan0 is directly connected to the internet and i would like eth0 to be the wired shared connection.
So following the guide: * subnet is 192.168.1.x

Configure your internal network card (eth0) for static IP like so:
1) sudo ip addr add 192.168.1.1/24 dev wlan0

Configure NAT
2)sudo iptables -A FORWARD -o wlan0 -i eth0 -s 192.168.1.0/24 -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

Save iptables rules
3)sudo iptables-save | sudo tee /etc/iptables.sav

Modify /etc/rc.local file
4)iptables-restore < /etc/iptables.sav

configure routing between two interfaces
5)sudo sh -c "echo 1 > /proc/sys/net/ipv4/ip_forward"

edit /etc/sysctl.conf
6)net.ipv4.conf.default.forwarding=1
net.ipv4.conf.all.forwarding=1


Client Setup *do i input these steps into the client machine or host??
1)sudo /etc/init.d/networking stop
2)sudo ip addr add 192.168.1.100/24 dev wlan0
3)sudo ip route add default via 192.168.1.1

So i followed these steps, but since i'm using /etc/network/interfaces what shoud i put in that file for eth0?
auto eth0
iface eth0 inet static
address ??
netmask 255.255.255.0

do i need to add any more??
 
ponder

ponder

Honorary Master
Joined
Jan 22, 2005
Messages
92,823
You can not have two interfaces in the same network/subnet, just keep that in mind.

What are the addresses configured on your interfaces?
 
E

etherion

Active Member
Joined
Dec 13, 2011
Messages
38
wlan0 is configured on 192.168.1.xxx on a dhcp.
I've not configured eth0 as i am not sure what to put in
about the two interface not on the same network/subnet if wlan0 is on 192.168.1.x should eth0 be on 192.1168.0.xx or what
 
E

etherion

Active Member
Joined
Dec 13, 2011
Messages
38
ok, so i've followed the instructiions again
Host=wlan0 is on 192.168.1.x
client eth0 is on 192.168.0.x

so for the host will the /etc/network/interface file look like this
auto eth0
iface eth0 inet static
address 192.168.0.xx
netmask 255.255.255.0
gateway 192.168.0.1

then for the client machine will the interface file look the same?
 
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