Macbook and Linksys router

i am having a strange problem. My macbook had no problem connecting to my linksys wireless g router. now it is. Set to automatic it isnt getting any ip info. I have to set it to manual and enter all the info manually to get it to work. It has a full wireless signal, and a pc on the same network set to automatic works fine. Linksys told me that it was a problem using IPv6 and that i need to change it to IPv4, but i never had to do it before and it worked for months. And when i go to another location, my work, i can connect to that wireless network with the automatic settings. My solution is to have two locations, one for work set to auto and one for home set on man. i am just wondering why its acting this way

I'm also having trouble with my MacBook and my Linksys WRT54G since the last update...
I've found that if I disable the password/encryption security it works fine - but if I have either WPA or WEP enabled, then I can only connect manually, and even then it doesn't get a proper IP address and I can't access the net, even though it shows me as connected with a good signal.
So, for now, I've enabled the MAC address filter so that only my computers can access the wireless network. I'd rather have the WPA or WEP encryption, but it appears something about that update has made that not an option when using a Linksys router.
G5 Dual 2Ghz; MacBook 2Ghz w/2GB RAM; 20GB iPod 3rd Gen; 40GB iPod Photo   Mac OS X (10.4.7)  

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