Cannot go to the Internet from Mac OSX, and Fedora Core 5

All Windows users (XP, 2000, Vista Beta) can connect to the Internet no problem on WRT54G with Firmware v4.20.6 (may 26, 2005). But odd enough, though getting the right DHCP assigned IP addresses and DNS server address, MacBook Pro (OS 10.4.1) and Fedora Core 5 cannot go to the internet at all using Safari and firefox browsers: the message keeps saying that your computer is not connected to the internet. Tested with BOTH wired and wireless connections, no luck to the internet. So, it's not about the wireless settings and setup. It doesn't work even if I directly connect the CAT5 cable to the router port.
Tested at wireless hotspots, at work where we have Cisco access points, and at a friend's place where there is netgear wireless router, MacBookPro is just working fine connected to the internet.
Any suggestions? Linksys doesn't support Mac and Linux PCs at all?

Thank you very much All (devildance, and Frank).
Seems like it is working fine now...
I reset the router as factory default, and reconfig the wireless setting(disable broadcasting SSID, configure TKIP PSK, and MAC filtering). Directly connected CAT5 cable from the router to my MacBookPro Windows XP. Working fine. Switched to Mac OSX, working fine. But, when I disconnected the LAN, and attempted to connect wireless, I couldn't go to the Internet using Safari and Firefox: keeps saying that your computer is not connected to the Internet.
Still could ping to 4.2.2.2 and 207.232.22.25, but getting errors "could not resolve the host name" when I pinged with the hostname bearshare.com.
Connected the wired CAT5. Working fine. Unplugged and used the wireless, could not get to the internet.
Checked the NICs settings on both LAN ethernet and wireless airport. All seems the same and correct: IP address, subnetmask and gateway address, and NO DNS entry. The same settings, but works on LAN cat5, and not works with wireless. So, for the sake of it, just manually added the DNS server IP addresses and domain names on wireless NIC. And Wala...it is working fine with wireless. Still strange the fact that Ethernet LAN NIC still doesn't have any DNS entries and working fine, but required DNS entries on wireless NIC.
For Fedora Core, could ping and resolve names without changing any settings. But when going to the Internet, got the error saying "comcast doesn't support this platform/OS" and another error "Welcome to Comcast High speed Internet....registration currently unavailable" when attempting to go any websites. Notieced that we pinging cnn.com, bearshare.com, or any websites, got ping reply from the same IP address which appears to be one of the comcast DNS server IP, 68.87.64.132.
So, I think it is a comcast issue not supporting Linux or something else which I would need to call to Comcast about...
But, thanks...looks like I can go to the Internet on Mac OSX, and Fedora core now with Linksys WRT54G. Thanks so much guys for all the suggestions....

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