Setting up Bridge/Firewall on Ubuntu
Make your Ubuntu's /etc/network/interfaces
look like this:
# Interfaces to bring up automatically
auto lo br0
# Loopback
iface lo inet loopback
# Physical interfaces
iface eth0 inet manual
iface eth1 inet manual
# Bridge
iface br0 inet dhcp
bridge_ports eth0 eth1
Then reboot.
Your Ubuntu box is now directly connected to the internet via interface br0
, with its networking configuration assigned to it via DHCP (I assume your ISP is running DHCP). Your Windows 7 PC is also directly connected to the internet, since it is plugged into the bridge. You will need to be certain to have appropriate firewalls configured and running on both machines.
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Aliostad
Updated on September 17, 2022Comments
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Aliostad almost 2 years
I have been banging my head against the wall with trying to configuring bridge on my Ubuntu. I am a novice user on Linux but an IT professional of 10 years experience on windows. So I would understand the concepts but just cannot get the steps mention on internet working for me.
What I need is to be able to bridge my eth1 to eth0. My Ubuintu 10.4 LTS box has two adapters eth0 and eth1 and I want to use it to connect my Windows 7 PC to the internet (and external network). eth0 is connected to the external network and has DHCP. eth1 is connected to windows 7 using a Cross cable.
Here is my output for ifconfig:
eth0 Link encap:Ethernet HWaddr ~~~~~~~~~~~ inet addr:10.128.4.250 Bcast:10.128.255.255 Mask:255.255.0.0 inet6 addr: fe80::203:47ff:fecf:a008/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:13936 errors:0 dropped:0 overruns:0 frame:0 TX packets:3277 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1953127 (1.9 MB) TX bytes:3887075 (3.8 MB) eth1 Link encap:Ethernet HWaddr ~~~~~~~~~~~~~~ UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:8 errors:0 dropped:0 overruns:0 frame:0 TX packets:8 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:480 (480.0 B) TX bytes:480 (480.0 B)
And this is my /etc/network/interface (what it looks now after reverting back to what it was since i tried numerous things but did not work):
auto lo iface lo inet loopback
I have already installed bridge-utils by downloading and then installing it and I can use
brctl
. So I know that I need to define br0 and I have done that but it never worked.Can you please tell me what steps I need to do to get it working?
Thanks in advance Ali