Re: Leopard keeps picking up a spoofed IP

Amanda Ripanykhazov wrote:
More importantly I suspect some loss of sensitivity at the AirPort
card end along with the possibility which I DO accept that there are
other strong signals nearby, overloading my computer. If I move my
computer across a certain room between the place where I have these
problems and the router, I can almost tangibly see the signal drop off
at around 25 feet from the router and with nothing significant
intervening at that point: There are no electrical appliances of ANY
type nearby! So much so that I have installed and configured another
router (a Buffalo 80211G) as a DD-WRT_VAP repeater to amplify this
signal! And cranked the output power up to a legal maximum of 99
milliwatts.

That may be a problem. If you are listening to music, as it gets louder
it starts to become distorted. The same with radio signals. If you use too
much power for the amplifier in the router to handle properly, the signal
becomes distorted and can not be understood.

25 feet is a good distance for WiFi the claims of 100 meters are almost never
realized. It also depends upon the antenna, the one in a laptop is usually
very small. Polarization matters, in plain English if the antenna is vertical
inside the laptop and horizontal on the router, there will be a significant
loss (26dB, or around 100 times).

If you are using 802.11 N connections, there is a signifcant difference
in the range if you are using 5.8gHz (and it's legal where you are),
then the range will be much less than 2.4gHz.

If you are using microwave oven robustness, try turning it on. If it is on, try
turning it off. It really helps reduce interference from microwave ovens
(and radar), but not from other sources and if there is no interference slows
things down.

I was toying with the idea of doing this with a WRT-150N
which I have lying around as it probably has better range but I havent
been able to figure out whether this particular router (a VT1) can be
set up as a repeater and the DD-WRT forums are a bit quiet on this
point?

The card is an AIrPort Extreme with Broadcom firmware version BCM43xx
(4.170.25.8) and I wouldn't have any idea how to update the firmware
otherwise than through an Apple Update. Is there some way of doing
this?

Not that I know of. You may be able to do it under Windows but then you
could end up with a level of firmware not compatible with MacOS. Very
unlikely, but I can't say 100% it will work.


Anyway let me try Kismac and see what happens.(I didnt know
that there was a Mac version of Netstumbler). Computers right next to
this one can connect properly and this one cannot see enough of a
signal to assign a DNS. I had been told by Fios that only a full
digital spectrum analyser can tell me exactly what interference there
is which might be preventing my computer from accessing my network in
circumstacnes where occasionally it WILL access a neighbour's one
instead! I doubt that it is an incorrectly set password on the WEP
end or this computer wouldnt ever be able to access my network through
my FIOS router. However I have a linksys VoIP router with no
encryption on the same network and it has all the same problems as the
FIOS one does. I am pretty sure I have NO third party firewall.

Is the Linksys router also wireless. Try moving the channel. It would be
best to keep them at least 2 apart, e.g. 1 and 3, 2 and 4, 1 and 13, etc.

You could also try turning off the encryption and any authorization if you
have it on, MAC address filtering, etc. If that works you can turn on
what you need.

Make sure that the SSID (network name) of the FIOS and Liksys routers are
different (or the same if that's what you want). WiFi is designed so that
all access points (the radio part of a router, for example) in a network
are treated as if they were equal priority. The computer connects to the
one with the strongest signal, no matter which channel it is on.

Unless the VoIP router is set as a passthrough device, it should not have
the same SSID as the FIOS router. IMHO it should not have WiFi enabled
at all.

My guess is that it is set up as a seperate subnet with it's own DHCP server
and so on, and if they both have the same SSID it would really confuse things.

Geoff.

--
Geoffrey S. Mendelson, Jerusalem, Israel gsm@xxxxxxxxxxxxx N3OWJ/4X1GM
.

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