MacBook WLAN goes grey and AP list becomes empty

I have 10.4.8 MacOS X and A-Link RR24AP modem/WLAN AP
After little Internet use over wireless(this is variable) WLAN goes off and icon turns grey with no AP's listed anymore. Only solution so far is to go SLEEP mode and back to ON when everything is just fine.
Even now icon is grey and I had to connect LAN cable which works just fine.
iStumbler did not help me out (WLAN goes grey even that program is running).
thanks in advance!
.hyeena

Hi,
I have the same issue on my Aug 2006 MacBook. The WLAN connection (to an ASUS router) logs in ok after startup of the Mac, but drops the connection after a while and the icon goes grey. Apple apparently has been unable to fix this despite multiple updates to WLAN since I got the machine. BTW - a DELL XPS laptop also connects via WLAN to this router and does not exhibit this problem. I personally don't think this issue has anything to do with the make of the router. There may be some timing differences when it comes to the actual air interface messaging protocol, which influence how often and how soon the connection drops, but ultimately only the Apple laptops seem to have this issue.
On the MacBook - the following two things work for me:
1) Just to get the connection back up: Turn AirPort off and then on again.
As a result the connection to the network is reestablished.
2) To keep the connection up: Start a UNIX shell and continuously ping
your local default gateway / router every three seconds or so, e.g.:
ping -i 3 192.168.2.1
Let this command run in the background as long as you need the
connection.
This puts minimal load on the WLAN connection and for me it keeps
the connection in the air while I use the Internet etc.
(Caveat: I had read before in this forum that this method does not
work for everyone. It also does not work for me, if the interval
between pings is too long. 3s does the trick though (10s for example
would not, in my case !))
Hope this helps.
Regards,
Woelund
MacBook (black, 2GB, 120GB), 4H31 Mac OS X (10.4.7) iPod Photo 60GB

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