Ubuntu Internet Sharing Connection

Scenario: having multiple client, one switch and one eeepc that can connect to the internet through wireless connection.

At Host (the eeepc):

sudo gedit /etc/network/interfaces

copy these

auto eth0

iface eth0 inet static

address 10.8.16.1

netmask 255.255.255.0

broadcast 10.8.16.0

network 10.8.16.0

gsku gedit /etc/sysctl.conf

net.ipv4.conf.default.forwarding=1

sudo apt-get install dhcp3-server

gksu gedit /etc/dhcp3/dhcpd.conf

copy these:

ddns-update-style none;

option domain-name "mynetwork";

option domain-name-servers Nameserver1, Nameserver2;

option routers 10.8.16.1;

default-lease-time 42300;

max-lease-time 84600;

authoritative;

log-facility local7;

subnet 10.8.16.0 netmask 255.255.255.0 {

range 10.8.16.50 10.8.16.150;

}

Nameserver can be found from "cat /etc/resolv.conf"

gksu gedit /etc/default/dhcp3-server

INTERFACES="eth0"

enable ip packet forwarding:

gksu gedit /etc/rc.local

/sbin/iptables -P FORWARD ACCEPT

/sbin/iptables --table nat -A POSTROUTING -o ra0 -j MASQUERADE

source: http://ubuntuforums.org/showthread.php?t=713874