Wireless Difficulties - Home Network - Problems Came after installing SP2

I have a wireless network that I setup, was working great, used a linksys router to do it,
4 port access point wireless router. Have 5 computers in the house 3 of them are wireless two are wired,
Then I installed SP2 on two of the machines, (oh how service packs seem to cause more problems then they solve),
Now the connections on those two computers keep dropping on and off, My router shows up in the list just fine, but refuses to connect until I like reconfigure something (most commonly I just change the network from Open to Shared, or Shared to open) and it reconnects for about 15 minutes

My linksys router is set up to be 'shared key' not an 'open' system (well it used to be set up on 'both' as an option, but I've not chosen 'shared') with a WEP key requirement, and now at first I had 'Shared Key' before sp2 installed, and I just used the same KEY on every computer, so I figured it was maybe the fact that I used the same key on everycomptuer, so I assigned different keys to each computer, with of corse the proper key index, still no luck. I have all the proper advanced settings, down WEP as encryption shared system, coinciding with my router..
I was also thinking that maybe that my router should now be set to 128kb encryption instead of a 64 bit encryption on the keys.... but I'm thinking that'll just change the size of the keys.. in any case. I've heard of several other pple with similar problems, but I haven't been able to find someone that has an identical problem

My router is a Linksys BEFW11S4 (just updated the firmware)
two cards are: Dlink extreme G650 (or something) to that effect, and the other is a built in one on a laptop.. (can't remember the name off of the top of my head) both drivers have been updated to their latest versions.

Thanks ahead of time, Arthur

Really important that i get this answered.. :S!!! thanks!
arthur5005Asked:
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stevenlewisCommented:
first check for any firewall issues
next try using the config software that comes with your wireless NIC's instead of the windows zero wireless config (if possible)
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arthur5005Author Commented:
*nods* Already done. windows Firewall both turned off on computers, no firewall on my internet connection, the linksys router is configured pretty openly, and the Dlink nic came with some software, so I got the latest version of that software, and now it's connecting more OFTEN, but the disconnections are still rampant.
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stevenlewisCommented:
You,ve shut off the zero config service?
how's the signal strenght?
any other wireless networks near you?
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arthur5005Author Commented:
yeah zero config was turned off for the dlink software to handle it, which on one computer it's handling way better than the other.. The main problem seems to be when the computer asks for an IP address, it sits there saying that it's 'aquiring network address' sometimes it works, sometimes it doesn't and it gives my computer that crappy 169.xxx.xxx.xxx adress that's some default microsoft address when windows can't pick one up, and of corse my ip adresses start at 192.162.1.1 soo..

and yeah, the signal strength is extremly high.

I'm hearing rumors that my Linksys router has issues with handling dhcp, in giving out ip adresses, BEFW11S4 I think. Ver 3.2
updated the firmware there as well

soo. yeah.. that's my info,, anyone help?!?!
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stevenlewisCommented:
what happens if you assign a static ip to the wireless
try
192.168.1.20
mask 255.255.255.0
gateway 192.168.1.1
and use the dns servers ip provided by your isp (can be found on the router)
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arthur5005Author Commented:
yeah, objections, no one has helped me in the least with this problem, I don't want out points, if I have to I'll give 1/3rd what I offered, my wireless network is open right now because my WEP keys aren't working at all with my machines running SP2, so I refuse to give out points.

Thanks.

Arthur.
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stevenlewisCommented:
Well, the questoner responds :-)
how about answering my last post :-)
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arthur5005Author Commented:
yeah, static ip's no dice
that was the second thing I tried.
(and I know the procedure, set ip address in winblows from dhcp to static, and set it, and define them in the linksys router, works fine on the wired side of things, my two wan computers, but the wireless side of things still has major problems)

Thanks
Arthur
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stevenlewisCommented:
>>My router is a Linksys BEFW11S4 (just updated the firmware)
before or after the problems?
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stevenlewisCommented:
I know this will be a pain, but on one machine, uninstall SP2 to see if that indeed is the issue
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arthur5005Author Commented:
yeah, it works without sp2, but the girl really wants sp2 on her system (and I know, sp2 isn't anything but that firewall crap and that wirelesszero config stuff, and that she can have all the updates without sp2.. but she's anal) It's weird, it seems somehow that 2 of the machines that are having connectivity problems seem to be 'battling' it out for a connection. But I gave them seperate keys and everything.. This is soo damn aggrivating :S. And I have updated firmware for the linksys router too.....

So I'm just leaving it 'open' for the time being, no keys required, thus no conflicts, on a side note though.. I'm paranoid as hell having it open, is there anyway I can see how many wireless connections are given out on my linksys router, again it's a Linksys BEFW11S4, I thought maybe if there were some 'outside' users (cause I live in this large appartment/house with lots of neighbhors) that maybe I'd look at my ip address and see the number it gave me to find out how many pple are connected, I think I'm ok, but it'd be nice to know if the connection goes over 5, so then I really know I need to close this thing up.

Thanks
Arthur.

(I'll give ya points fer the SP2 comment if ya got a good way to count my connection ;) ) but if there's no way to do it, then don't worry I'll give ya the points none the less.. but help me out on the counting connections thing.. :S really googling it up hard.
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stevenlewisCommented:
what happens if you enable mac filtering, but leave wep open?
disable dhcp (use static), and disable SSID boradcasting
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Kimura_KalidorCommented:
I had this issue. First and easiest solution. Get a WRT54G. The BEFW11S4 (Hardware Revision 4) has numerous security and connectivity issues. If not on revision 4, then you can still try this but may not help ...

Basically SP2 does somethign funky with the MTU settings when you install it. This seems to drive the BEFW11S4 bonkers.  First thing to do is get find the MTU that is optimal for your computer. Using the ping command set the packet lenghth to 1500 and force not to fragment. Back down by 10 bytes until you stopp having issues. (I usually use the backbone router at 4.2.2.2 for this test)
Example:
ping -f -l 1500 4.2.2.2   >   Packet needs to be fragmented but DF set.
ping -f -l 1490 4.2.2.2   >   Packet needs to be fragmented but DF set.
ping -f -l 1480 4.2.2.2   >   Packet needs to be fragmented but DF set.
....
ping -f -l 1420 4.2.2.2   >   38ms reply

Next go back up by 2 bytes until you get an error.
ping -f -l 1420 4.2.2.2   >   38ms reply
ping -f -l 1422 4.2.2.2   >   38ms reply
ping -f -l 1424 4.2.2.2   >   Packet needs to be fragmented but DF set.

In this case a byte lenght of 1422 is the correct setting. Now using this info you have to force the MTU setting in windows. Refer to http://support.microsoft.com/default.aspx?scid=kb;en-us;314053
and the 'MTU' DWORD setting listed on that page.

ZZ



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arthur5005Author Commented:
PERFECT!!!

Thank you soo god damn much!!!
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