Router Problem - Works with Windoze, Linux, but not with Mac

I can't seem to get any router to work with my Mac.
I've tried a Linksys 'b' router, a Netgear 'g' router and a Belkin 'g' router.
No joy.
When I connect my Mac directly to my cable modem (Motorola Surfboard), there are no issues. When I connect the router in between, the Mac pulls the proper ip address and I can ping the router, but I can't get any further. If I try to ping an outside ip address (such as the 4.2.2.2 dns) I get the error message "ping: sendto: Cannot allocate memory". [Does anyone know what this message means?]
A second computer (IBM NetVista) connects reliably using Windoze XP. The same machine, booted in CentOS also connects reliably (after disabling the firewall).
Note, these are all wired connections. I'm not even trying to use wireless yet. The cables all check out, since they all work in other configurations (the Mac->router cable is the same one I use for Mac->Surfboard, and the router->surfboard cable works when connecting from the NewVista machine.
I thought the Mac problems might be firewall related. I had "Brickhouse" installed,but it has since been removed. My network settings no long advise that there is any firewall software in place (previously Sharing > Firewall was greyed out with message that other firewall software was installed). Sharing > Firewall now reports "Firewall Off".
I know the routers work, since I can connect from the NetVista machine. I know the cables are good, because they all work in other configurations. I know the Mac is seeing the router, and the router is seeing the Mac because a correct ip address is pulled. I can even communicate between the machines (ftp,ssh) but I can't get internet access using the Mac through the router.
Oh yeah... one other oddity. When I have personal web sharing enabled, an attempt to access the router setup page at 192.168.1.1 fetches the local server index.html page instead of accessing the router. When web sharing is off, I get a "you are not connected to the internet" message.
Any insight?

Very strange indeed!
Only 2 suggestions at this point...
Get Applejack...
http://www.versiontracker.com/dyn/moreinfo/macosx/19596
After installing, reboot holding down CMD+s, then when the prompt shows, type in...
applejack AUTO
Then let it do all 5 of it's things.
At least it'll eliminate some questions if it doesn't fix it.
The 5 things it does are...
Correct any Disk problems.
Repair Permissions.
Clear out Cache Files.
Repair/check several plist files.
Dump the VM files for a fresh start.
Try dragging these files to the Desktop & Reboot...
/Users/nnnn/Library/Preferences/com.apple.internetconnect.plist
/Library/Preferences/SystemConfiguration/preferences.plist
/Library/Preferences/SystemConfiguration/com.apple.airport.preferences.plist
/Library/Preferences/com.apple.sharing.firewall.plist

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