Re: Need two building one instrument advice

Jeff Liebermann wrote:
On Thu, 29 Jan 2009 12:24:09 -0800, Todd <todd@xxxxxxxxxxx> wrote:

I was thinking of putting both AP's on the
same SSID but using different channels.
I was wondering if this would help of hinder
the "automatic logon" when walking through
the door requirement.

Anyone has any advice on the issue?

You're on the right track. You need two wireless access points *OR*
two wireless routers configured to act as access points. See:
<http://wireless.navas.us/wiki/Wi-Fi_How_To#Use_a_wireless_router_as_a_wireless_access_point>
Methinks you'll find the wireless routers to be slightly cheaper and
more available.

You can use the same SSID mostly because it's unlikely that the
handheld will be in a position to hear both AP's. However, it's not
really necessary unless the device insists on automatic connections or
has some provisions for seamless roaming. I would take the easy way
out and just use two different SSID's.

As for automatic logon, it really depends on whether the device is
smart enough to all multiple configurations and login combinations. If
so, then you can use different SSID's with corresponding login/passwd.
However, if it assume that there's only one SSID on the planet, you'll
probably need to configure both AP's to the same SSID, and just see
what happens. Seamless roaming is not commonly supported and it may
have the bad habit of tenaciously refusing to disconnect from one AP,
before switching to another.

You could use the same non-overlapping channels (1, 6, 11), again
because the device is unlikely to hear both AP's at the same time.
However, if you don't have any interference issues (unlikely inside a
metal building), you should probably use different channels.

Selection of IP addresses is strictly for web based configuration. For
example, if your router is 192.168.1.1, then you could use 192.168.1.2
and 192.168.1.3 for the two AP's. The actual IP doesn't really matter
as long as there are no duplicates and that they're all in the same
Class C IP block.



Thank you!

I will do the two SSID route. The hand held calibrator
will handle multiple SSID's and allows for automatic
logon. I will position the channels away from anything
that manages to get through the metal building from
adjacent businesses.

-T
.

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