I have the same issue with the WRT54G router and a WMP54G wireless card,
although I have not yet installed SP2. I installed the latest (at that
time) Windows XP WPA Hotfix (KB826942 from Microsoft) and latest WRT54G
firmware upgrade 2.02.7 (as of 5/6/04).
With the above configuration, I will lose the connection for several minutes
every so often (a few times per day). I have the security set pretty high:
WPA (with best encryption possible), MAC address filtering, no broadcast of
SSID, etc.
I do have wireless zero configuration enabled. When I tried disabling it, I
couldn't see ANY connections to choose, much less enable a connection and
have it work. I have heard that others disabled it (and some of them used
another kind of wireless management program) and had everything work well.
Wierd!
Without the security (no encryption, no MAC filtering, broadcast SSID to the
whole neighborhood), I maintained a consistent connection (slightly faster
too) that never went down, unless my someone walked by with a 2.4 GHz
cordless phone. Then, there were temporary interruptions.
In my opinion, the WRT54G router and WMP54G PC card do not broadcast very
powerfully compared to other wireless router choices. This can actually be
a benefit in that a neighbor's wireless system has a smaller chance of being
able to pick up my router's transmissions.
My advice (take with a grain of salt as I am no expert):
1) Ease up on the encryption as much as possible. Go to a smaller bit (not
128). See what happens.
2) Set your router to broadcast the SSID. So what if your neighbors next
door can see your router show up on their PC's wireless system. As long as
you keep some encryption, they can't access it. I keep mine turned off
because of my conspiracy theories about the IRS, ATF, and one world
government.
3) Try the lesser WEP encryption. It's not as good, but since when do you
need to keep CIA-trained hackers from accessing your system? I keep mine on
WPA because it makes me sleep better at night. I can live with the
interruptions. Of course, having the connection go down while playing Call
of Duty online tends to tick me off to no end.
4) Get rid of all 2.4GHz cordless phones and electronics. Hey, if the
wireless system is that sensitive to even the slightest hiccup in that part
of the EM spectrum, buy a 5GHz cordless phone. They're pretty cheap now a
days, and you're cordless phone reception will be better.
5) Stupid, but funny...line your walls and ceiling with aluminum foil or
lead-lined sheetrock (if you have the money). Then, disable all security on
your router. Your family will look at you strange, but your friends with
pocket protectors will think that you're the man!
I think that these Linksys products are just not the best on the market
(best technology wise and best value either).