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diff --git a/src/Ubuntu_Bridging_Network_Interfaces.adoc b/src/Ubuntu_Bridging_Network_Interfaces.adoc new file mode 100644 index 0000000..94ec3a5 --- /dev/null +++ b/src/Ubuntu_Bridging_Network_Interfaces.adoc @@ -0,0 +1,126 @@ +Ubuntu:Bridging Network Interfaces +================================== +:author: Aaron Ball +:email: nullspoon@iohq.net + + +== {doctitle} + +I have recently been struggling with configuring an Ubuntu server to allow +bridging network interfaces. I had one working long ago on another test +machine, but it was overwritten with a new install. That being said, for quite +some time today I researched this and never really found an answer. I did +however find a few websites that eluded to possible methods for doing this. +After piecing said methods together, I managed to bridge four Ethernet ports +together. + +All that being said, + + +[[heres-what-i-needed-to-do...]] +== Here's what I needed to do... + +I have four ethernet ports on this awesome quad core xeon processor (hehe...I +have to brag a little bit at least) powered server. One port plugs into the +switch and provides the box with access to the interwebz. Another port goes to +another server, supposing to bring the int3rw3bz to that box as well. The third +port goes to a wireless router, providing wireless access to the 1nt3rw3bz. + +Let's see how poor my spelling of 1nt3rw3bz can get by the end of this... + +[[example-assumptions]] +=== Example Assumptions + +You have at least two network adapters. In this case I have +four Ethernet adapters. This post will be working with those four. + + +[[how-to-do-it]] +=== How to do It + +Run + +---- +sudo apt-get update +---- + +to make sure that all of your repositories know of the latest software. + +After that, run + +---- +sudo apt-get install bridge-utils +---- + +This will install the necessary software to seamlessly bridge network +interfaces. + +Now... + +Using your favorite text editor, crack open /etc/network/interfaces + +---- +sudo vim /etc/network/interfaces +---- + +If you haven't done any manual customization of network interfaces yet, you +should see something like... + +---- +auto lo iface lo inet loopback +---- + +After this entry, type in + +---- +auto iface inet dhcp bridge_ports <interface> <interface> <interface> +---- + +For my specific situation, I used... + +---- +auto br0 (or auto <bridgename>) iface br0 inet dhcp bridge_ports eth3 eth0 eth1 eth2 +---- + +After that, type + +---- +sudo /etc/init.d/networking restart +---- + +... and that will bring online your bridge along with all the bridged ports. + +**If you need your box to have a statically assigned ip address**, don't assign +it to the interface with the physical internet connection (in my case, eth3). +Instead, assign it to the bridge itself. + +In a situation like mine, your bridge interface would look like... + +---- +auto br0 +iface br0 +inet static +address 10.0.1.185 +netmask 255.255.255.0 +network 10.0.1.0 +broadcast 10.0.1.255 +gateway 10.0.1.1 +bridge_ports eth3 eth0 eth1 eth2 +---- + +There you have it. A network bridge between as many interfaces as you want (or +at least the four I tested it with). This of course will work with wireless +interfaces as well, such as bridging an ethernet port to a wireless connection, +essentially allowing a machine physically connected to a computer with wireless +to not have to physically be connected to a wireless router (internet comes in +through the wireless card and piped through to the ethernet port). + +Happy bridging everyone! + + +Category:Linux +Category:Ubuntu +Category:Networking + + +// vim: set syntax=asciidoc: |