Re: Bridging wifi to ethernet

Tod Merley wrote:

Hi Doug! Doing a similar thing in the interest of my LUG. What follows is for Ubuntu Breezy but the issues are the same: I used System>Administration>Networking to establish a static IP (192.168.1.1 <javascript:dl('http://192.168.1.1',1);>) for the laptop ethernet port (and to see that wlan0, the wireless port, was connected to the proper AP and to know it's IP).

Instructions for setting up the dhcpserver I found at: http://ubuntuguide.org/#dhcpserver The iptables in Breezy come unset. Forwarding accomplished by:

# iptables:

# Delete and flush. Default table is "filter". Others like "nat" must be explicitly stated.

iptables --flush            - Flush all the rules in filter and nat tables
iptables --table nat --flush

iptables --delete-chain - Delete all chains that are not in default filter and nat table

iptables --table nat --delete-chain
# Set up IP FORWARDing and Masquerading

iptables --table nat --append POSTROUTING --out-interface wlan0 -j MASQUERADE

iptables --append FORWARD --in-interface eth0 -j ACCEPT

echo 1 > /proc/sys/net/ipv4/ip_forward - Enables packet forwarding by kernel

#

A friend of mine (Paul Edwards) added:

"The excellent "Firestarter" Gnome firewall software makes this an

incredibly simple and easy-to-do task with the nice user-friendly GUI.
"

Browsing appears normal (laptop or downstream), and use of the "apt-get" "Synaptic" and other tools as well. However, I had to pull down the Firestarter forwarding/firewall (iptables GUI) to enable the use of an FTP server on the laptop (again, an Ubuntu box - I did get dual boot on FC4 on this box yesterday but have not tried the NAT thing on FC4 there yet) on its ethernet path to another desktop FC4 box on the ethernet wire. I could ping everywhere and I could browse to the ftp server ( ftp://192.168.1.1 - the laptop ethernet port) from within the laptop but no one on the wire could do the same. Well, at least I am pretty well ready for the next public linux technical session. Cheers! Tod

Regards

Doug P