Speech:Summer 2012 Netbridge


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What I did
I continued off of the work on this that Evan Morse started last semester. He used instructions found here. There was an additional step that needed to be done to the client machines that was not noted in these instructions. In summary, the server must have two network cards. One will connect to the external network (internet) and the other will connect to the internal network (the client machines). The server will pass information from the internet to the clients and vice versa.

I have listed the steps below for configuring the Network Bridge:

Server Side
 * Start YaST
 * Go to Network Settings under Network Devices
 * Select the network card that will connect to the internal network and choose edit.
 * Change the IP address to a statically assigned IP address of 192.168.10.1 with a Subnet Mask of /24. The hostname should be caesar.
 * Save the changes and return to the main menu.
 * Open the Firewall settings under Security and Users
 * Under Masquerading check the "Masquerade Networks" box to enable the bridge.
 * Save changes and exit

Client Side
 * Start YasT
 * Go to Network Settings under Network Devices
 * Select the network card that will talk to the server (caesar) and select edit
 * Change the IP address to be a static address in the same subnet as the server (e.g 192.168.10.x)
 * Ensure that the Subnet Mask is set to /24
 * Confirm that the hostname (computer's name) is entered and return to the previous page.
 * From Here go to Hostname/DNS
 * Enter the computer's name under the Hostname
 * The Domain Name should be caesar
 * Enter the following address for the Name Servers: 132.177.189.40, 132.177.189.41, 132.177.189.4
 * The name servers can be obtained by logging into caesar and typing cat /etc/resolv.conf
 * Look for the lines starting with nameserver
 * Enter caesar under the domain search
 * Tab over to the Routing section
 * Change the Default IPv4 Gateway to the IP address assigned to the internal network card on caesar (192.168.10.1)
 * Change the Device on the drop-down to the network device that will be used to talk to caesar.
 * Save the changes.
 * Repeat these steps for each client.

How to use it
The network bridge will be turned off by default. To enable it, follow these steps:
 * Log in to caesar
 * Start YaST
 * Go to the Firewall settings under Security and Settings.
 * Under Masquerading, check the "Network Masquerading" box.
 * Save the change and exit.

To disable it, follow the same steps as above but uncheck the "Network Masquerading" box.