How can I make two lans, one on the first floor using a wired router with cable to a second floor office using a wireless Airport extreme with cable?

How can I make two lans, one on the first floor using a wired router with cable, to a second floor office using a wireless Airport extreme with cable? I want both offices to share the cable modem and also receive the IP addresses from the Linksys wired router on the first floor. I already ran a CAT5E T/P cable from the 1st floor to the second floor.
I tried to disable the DHCP on the Airport extreme but there is no disable feature. I need the Airport on the 2nd floor because there is no way to run T/P and they are using 7 lIMAC computers.
I would like them to be on the same LAN segment to be able to share files and printers.
Can this be done?
If I have to I can give them all static IPs.
mkaczowskiAsked:
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jasonuocsCommented:
Hi Mkaczowski,

From what I understan of your question is that you have a Cable Router (CAT5) from here you have a CAT5 cable running to the 2nd floor which has your Airport Extreme. From here you are wanting the workstations on the 2nd floor to connect using wireless.
If I have understood correctly then you need to disable DHCP on either one (Router or Wireless Access Point, you can only have one DHCP Server per subnet) Set your Wireless AP up as far as the security goes then bingo you should be away. Might simplify things if you make sure they are all on the same workgroup.

Hope this helps

Jason
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mkaczowskiAuthor Commented:
Jason,

I want to get rid of the upstairs cable modem and share the downstairs one since both floors have now become one company. I can easily disable the DHCP on the Linksys but I want to disable the DHCP on the airport if possible. Do you know how to do this? I am extremely familiar with all Linksys peripherals.
The MACs on the second floor have to connect wirelessly to the Airport Extreme because there is no way to cable it. I need the airport so the MACs can get to the internet as well as connect to the downstairs LAN.
Right now the downstairs segment is 192.168.1.X and the upstairs is 10.0.1.X. I will also be installing a SBS 2003 as a DC for file sharing and printing. But first, I would like to have both floors on one segment sharing only the downstairs cable modem.

So what do you think?
Mark
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jasonuocsCommented:
Hi Mark,

I am not too familiar with AE but have found a few forums looks like you need to log into AP Admin Utility then remove the tick from distribute IP addressed. Have a long read of this and see if it helps.
http://forums.macosxhints.com/archive/index.php/t-57651.html 

Jason
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mkaczowskiAuthor Commented:
Since there is no way to disable the DHCP function on the Airport Extreme, you must replace it with an Acess Point that can be easily setup with the existing Linksys router. This will allow the Linksys router to control the DHCP and the IMACs will use the AP to access the internet and LAN.

Mark
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strungCommented:
You are incorrect when you say there is no way to disable DHCP on the Airport Extreme. The post by Jasonuocs tells you how to do it.
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mkaczowskiAuthor Commented:
NO Strung, I am not incorrect.  There is no section on an Airport extreme N series for: Do not distribute IP addresses.
It might exist in an older model AE but not the one I have. If it were that simple, I wouldn't be on this site asking for input.

Mark























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strungCommented:
If you switch the AEBS into Bridge Mode (rather than Share an IP address) that should turn off the DHCP server.
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strungCommented:
See pages 4 and 36 of the Apple document "Designing Airport Networks":  

http://manuals.info.apple.com/en/Designing_AirPort_Networks_Using_AirPort_Utility.pdf
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strungCommented:
Page 36 should show you exactly how to do what you want to do.
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Vee_ModCommented:
Force accepted.
Vee_Mod
Community Support Moderator
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