WRT120N DHCP Tables being fickle

I plug one of my computers or my xbox360 into the router via cable and they connect to the internet fine, they get an ip assigned by dhcp and it works great.  One problem... they don't show up in the dhcp tables!  I have another computer hard plugged that shows up fine and two others that show up after connecting wirelessly.  Even my networked printer shows up.  As long as the xbox connects I guess I don't care but I needed to forward ports to the computer that doesn't show up so I found its mac address and added it to the reserve list manually.  This anomaly is making me go insane trying to figure it out.  A very strange problem indeed...

Seems to be a problem for years. Many routers have this problem. I think on some routers the problem is related with a long host name of the device (which the DHCP client tries to register) or special characters in the host name (e.g. a space).
For port forwarding it is recommended anyway to use static IP address either directly on the computer or through DHCP reservation. Without DHCP reservation you have to change the port forwarding each time the computer gets a different IP address...

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