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Configure multiple wireless routers on a network

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I've been left temporarily in charge of a a large network which I did not create.  It is running correctly.  I have a question about how to set up a wirless router to the network without disrupting the DHCP or IP addresses of devices on the network.

Basically the wireless router should not act to rename IP addresses but simply allow connections to the network and pass data appropriately.  

Thank you,

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Top Expert 2010

dunno, not sure on the make and model of the access point.

Typically you would have a IP database management system that will let you know what is been allocated and assigned for IP addresses. If you do not have one, you will need to scan the network to find an available IP address. On the wireless router, you will want to ensure that you disable any services that would conflict with your current network such as DHCP.



@rfc1180:  based on the way you tried to answer the question I doubt telling you the make and model would provide me a solution.

But in case others with knowledge of networks are curious to know these are linksys routers on a standard windows ethernet network.  

And obviously I don't want to conflict with the existing DHCP your answer was not helpful at all.

You must configure it as access point network, not as a Router
Top Expert 2010


your too funny!

With that type of attitude, then good luck!
Adam BrownSenior Systems Admin
Top Expert 2010

Configure the devices to work in Access Point mode under wirless configuration. Turn off the DHCP server on the main page for each one. Configure each to have the same SSID and Security setup. Make sure you connect the cables from your network to the 4 switch ports and not the WAN port. Give each device a static IP address on the LAN side (this is where RFC's recommendation comes in, finding IP addresses that won't conflict) and

With this set up, users should be able to set up their computers to communicate with the Access points and move around without having to reconnect when they get out of range of one and in range of another.
Adam BrownSenior Systems Admin
Top Expert 2010

Connect cables to one of the 4 switch ports, not all four (that would be a "Very Bad Thing (TM)")

the simplest solution is disable DHCP from all routers and configure the ip's of each machine manually,.. or you may run each router DHCP for a specific rate.. for example.. floor one router floor two and so on
Adam BrownSenior Systems Admin
Top Expert 2010

If the infrastructure is running DHCP through Windows or some other system, you want the Access Points to act as DHCP relays, not as DHCP servers.


Great tips guys thanks.   I don't think at this point I'm prepared to set up static IP's for all devices on the network.  At least for now I'd like to allow the dynamic assignments.  

So by connecting to one of the four switch ports and not hte WAN port will that indicate to the router not to use DHCP at all and simply relay? Or Do I need to configure more.

I'm looking at this router now and on the basic set up page it says


So that part that says DHCP Server  "enable" I should switch to disable.  correct?

There wasn't really any options that I saw in the "wireless options"  area that looked like related to what you guys were talkking about.  It just had MAC filtering and wireless security.

Some one said change the SSID to the same as the LAN ethernet network name?  This helps when moving from one wireless network to the other?

Thanks again.
I will offer you two solutions:
1. Using Different Subnets:
    a. Instead of Automatic Configuration (DHCP) select Static IP and give your router an IP on your Lan    Subnet IE:
    b. Set Local IP For your router (
    c. Turn On The DHCP Server on your router
    d. Give it a range -

2. Upgrade Your Router Firmware to DD-WRT which will enable DHCP Relay Agent, the upgrading process is very easy, you may check this website for detailed instructions
Senior Systems Admin
Top Expert 2010
Before you determine whether or not you're going to have the Access Points shoot out DHCP, you need to determine, for certain, that it isn't being done on your network already. If you run in a Windows Active Directory environment, chances are you already have a server somewhere handing out addresses, and can configure all the access points as DHCP relays instead of servers. To figure this out, go to a client, open the cmd prompt and type in ipconfig/all

   Physical Address. . . . . . . . . : 00-01-6C-6F-8A-82
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::1471:e307:3b4:e4a6%11(Pref
   IPv4 Address. . . . . . . . . . . :
   Subnet Mask . . . . . . . . . . . :
   Lease Obtained. . . . . . . . . . : Monday, July 05, 2010 12:53:17 A
   Lease Expires . . . . . . . . . . : Tuesday, July 13, 2010 12:53:17
   Default Gateway . . . . . . . . . :
   DHCP Server . . . . . . . . . . . :  <-------!!!!! this is what you're looking for

If you have a DHCP server configured on your network already, you need only set the APs up as DHCP relay points and configure them to relay to that DHCP server found in the IPConfig