Airport Base Station - setting up base station to already existing network

Hello,
I just replaced a network switch on the network. Since I did that I am unable to get Internet connection from our main base station in the server room that distributes the IP addresses. I did a reset to the base station and tried to get it to show on the already existing network, but I'm having some issues getting the base station configured with the other base stations on the network. How do I get this main base station to show up on our network?
Right now our other base stations are not getting valid IP addresses. The base station that is setup to distribute IP addresses is getting valid addresses from our provider. If someone could give me any suggestions I would appreciate it.
We are running Apple 10.2.4 on our network.

OK - starts to make sense now. If you did a factory reset of the base station then more than likely the airport network name for it is the Apple default name, and you probably lost the WDS in Wireless Mode.
Do you know the old network name and the network password? Do you know how the other 4 or 5 base stations were configured - ie as a WDS network and whether as relay or remote base stations. You should not need to change anything on these base stations if you know how your AEB (main) was setup in the first place.
One step back from this, you need to confirm that the DSL modem is connecting to your ISP. Connect the ethernet cable from the DSL modem to your Mac and confirm that you can log onto your ISP or internet. If it works then lets go onto the AEB you reset.
Apple publish setup manuals for their AirPort Base Stations - they can be downloaded at: http://support.apple.com/manuals/#airport
1. Reset your AEB to its factory default again.
2. Turn-off the AEB and connect one of its ethernet ports to your Mac by ethernet cable, and connect the DSL modem to the WAN port on the AEB by ethernet cable.
3. Power up your Mac, the DSL modem and the AEB and wait for all to complete their startup sequence. Then open AirPort Utility - you should see your AEB under a generic network name. Click on the AEB.
4. Use the auto setup procedure by clicking 'Continue'. Follow the onscreen instructions for setting up a new network. When asked, use the 'original network name' for your school network. When asked for a network password, use the 'original network password' for your school network (what sort of network security were you using - WPA2 Personal - use whatever you had previously.
5. At some stage you will also be asked to give the AEB a name and admin password - use whatever they were previously.
6. When the setup procedure is complete and the AEB finishes restarting, the AEB will reappear in AirPort Utility. Click on the AEB and click 'Manual Setup'. You may be asked for the admin password to get into the configuration profile.
7. Click on the 'Wireless' tab and set the 'Wireless Mode:' to 'Participate in a WDS network' if not already set to this. While in this pane, look at 'Channel:' - do you remember what this was set to previously (if not, you may need to connect one of the other AEBs by ethernet cable to a Mac and use AirPort Utility to check the Channel setting.
8. Now, click on the 'Internet' icon at the top of AirPort Utility. Check that 'Connection Sharing:' is set to 'Off (Bridge Mode)' - if not, change it.
9. Now, click 'Update' and wait for the AEB to restart.
10. Now, disconnect the ethernet cable from the Mac to the AEB ethernet port.
11. Open Airport Utility, and hopefully, you can now see the AEB and the other 4 or 5 base stations.
Let us know what happens.

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