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Wireless Networking Question...Multiple routers using the same SSID

Posted on 2005-03-23
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Wireless Networking Question...Multiple routers using the same SSID

I'm trying to set up a wireless network inside a medium size commercial building using 3 wireless cable modem/routers (before you ask why I'm using 3 modems, the building is that of a cable/broadband provider, so there are cable lines available throughout).

I have good coverage throughout the building between the 3 wireless devices and everything works fine, but I'm currently using 3 different SSIDs and would like to be able to use a single SSID instead.

My question is, how do I configure the wireless settings on the three devices so that when someone moves from one end of the building to the other, they still remian connected to the same SSID they were connected to, even though they are connected to a different device than they were connected to....I'm thinking the devices may need to have different IP addresses (default gateway on the client side) or perhaps be on different channels

I also would like to avoid a situation where a user is in between two of the coverage areas and their wireless card is constantly disconnecting from one device and then connecting to the other with the same SSID

Thanks,

John
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Question by:xanimal80
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7 Comments
 
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Accepted Solution

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snerkel earned 2000 total points
ID: 13612624
The only way this will **possibly** work is to have all three routers setup exactly the same except each needs to be on a different channel, and each needs to have a different block of DHCP addresses.

So for instance

router 1
LAN IP 192.168.1.1
SSID WAP
Channel 1
DHCP 192.168.1.2 to 192.168.1.82

router 2
LAN IP 192.168.1.1
SSID WAP
Channel 6
DHCP 192.168.1.83 to 192.168.1.163

router 3
LAN IP 192.168.1.1
SSID WAP
Channel 11
DHCP 192.168.1.164 to 192.168.1.244
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Expert Comment

by:snerkel
ID: 13612752
Just to add users may have problems if doing VPN or are on a secure site, or are downloading a file when moving between routers as the WAN IP address will change, other than that normal Internet usage should be seemless.

WiFi cards only switch from one AP to another when necessary, they won't keep switching back and forth just because the signal levels change slightly, this process should be seemless too.
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Author Comment

by:xanimal80
ID: 13612943
gentlemen,

thank you for the reply....

I se the three routers on the non-overlapping channels and tested it with laptop with an 802.11g wireless card and it seemed to work pretty seamlessly, always connecting to the access point with the strongest signal....

I then tested it on a iPaq with an 801.11b wireless card and it seems as though it would only search for another AP when the signal to AP it was previously connected to would drop off completely

Is this perhaps a difference between the two wireless standards that is causing the different result?
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Author Comment

by:xanimal80
ID: 13613224
oops, i just realized that you were the author of both replies....lol (shouldn't have used 'gentlemen')
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Expert Comment

by:snerkel
ID: 13613339
No b and g should operate the same, more likely the driver for the Ipaq is not as sophisticated as it is for the PC

By the way for the Ipaq one of the best wireless sniffers is WiFi FoFum http://www.aspecto-software.com/WiFiFoFum/
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Author Comment

by:xanimal80
ID: 13614593
that program looks pretty cool, but do I need winzip on my PDA to install it?

I tired installing netstumbler but apparently my version of Pocket PC is too new
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Expert Comment

by:snerkel
ID: 13616359
No, you need to unzip on your PC then copy the folder onto your Ipaq, the fofum web site gives details as it doesn't have an install program.

I tried Netstumbler on my Ipaq but it wouldn't work, fofum works perfectly.
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