I'm still somewhat of a newbie, so here it goes.

I have Slackware 10.2 installed on my laptop (Dell Inspiron 4000) (2.4.31 kernel I believe). I have a Dell TrueMobile 1150 PCMCIA wireless card on it which seems to be working properly (lights come on, slackware recognizes it, picks up networks). It picks up my router just fine. I see the router's MAC and the info in KWifiManager and everything, but here's the problem, I can't pick up an IP address and therefore can't get online. It picks up everything else from my router just fine. When physically connected it works fine. My router uses MAC address filtering and WEP encryption. The MAC address is properly entered into the router, and the key is correctly inputted on my laptop. When I had Windows XP on it earlier today, it worked fine. Signal strength is fine, it's at 57 saying "ULTIMATE" so I don't think that's an issue. Is there anything I might be missing? I'd like to use wireless so I'm not tied down with a cable. I haven't tried unsecuring my network, and I'd rather not do that (with good reason).

It should also be noted that this is also true with my college's wireless network as well so I think I can rule out improper settings with my wireless network, but I could be wrong.

Have you tried or whatever your wireless card name is?

That didn't seem to work, I even configured dhcpd.conf for my router...

I've configured /etc/rc.d/rc.inet1.conf as well

This is just confusing me

Hey Dark,
Firstly, try turn the Mac filter and WEP off on the router. Make sure that the DHCP Server in the router is turned ON
#Iwconfig
check what <interface> the card is listed as. eth1, wlan0 are common.
#iwconfig <interface> essid <networkname>
#dhcpcd <interface>
#ifconfig <interface>
Did the router give you an IP address on the last line? you should also see in the 'iwconfig' line the MAC of the router and the channel number.... etc...

If it works, set the router up again to have WEP and MAC Filtering enabled (keeping the DHCP server ON) + set authentication mode to 'open' -
#iwconfig <interface> essid <network name>
#iwconfig <interface> key <hex key>
OR
#iwconfig <interface> key s:<ascii key>
#dhcpcd <interface>

it is way better for troubleshooting using the console rather than that crappy wireless manager in KDE. I dont think i have ever really got that thing to work very well...
If you have authentication on the router set to shared key then you will need to enter
#iwconfig <interfae> key restricted s:<ascii> etc etc....

Could your college be using WPA for encryption? instead of WEP