Incomplete client table causing IP conflict?

I have an iomega net disk NAS wired to my Linksys WRT54GS V4 (along with some PC's, a Tivo, hub) + an XP wireless laptop on WEP.
The NAS and everything else is configured to us DHCP provided by the Linksys (firmware v1.06.3, the latest)
I can discover, access and administer the NAS most of the time just fine, I can see the IP on the NAS web page, but over on the Linksys router, the Status page DHCP Clients table does NOT show this device at all, just everything else.
Furthermore, when I shotgun the connectors on my new Win7 PC (i.e. "bridge" the wired & wireless device) invariably it - or the wireless laptop booted later - will encounter an IP conflict which cannot be cured via repair, release or renew.
Has anyone encountered either issue? I'm thinking they're related, no?
Is there a router, Win7 Network or NAS setting I'm missing? (BTW the NAS admin pages are very sparse in options)
Thanks for reading, hope you can help.
Al

1. Again: the list shown is known to be buggy. I think no one really knows what happens to the "lost" entries. They may be there internally and only the web interface is not able to show them. Or they may be really lost.
2. If the router has an lease on an IP address in its internal DHCP lease table it should not assign it otherwise as long as the lease is active.
3. I think, actually the DHCP server does not try to detect conflicts at all. Some DHCP server do (e.g. the Microsoft DHCP servers) but not all. Standard procedure for a DHCP client would be to check for a conflict before it accepts an IP address assignment. It just sends out an ARP request for the IP address in question. If a computer responds it is taken. If no computer responds it should be O.K. This is like a "poll" of all existing devices. A standard LAN broadcast.
4. If you set anything with a static IP address in your network, the IP address should be outside the DHCP address pool. With default settings the pool is 192.168.1.100-149 thus you can use 192.168.1.2-99 and 150-254 for static IP assignments.

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