WRT54G: limited LAN access when connected to WAN

Dear community,
I am observing a strange behavior with my fresh WRT54G (v 5, latest firmware):
When the router is connected to the internet via PPPoE, some things just don't work anymore.
1. I power up my WinXP machine + after the login the machine requests a new DHCP-lease. This process takes about 40 seconds! If I pull the plug to the DSL-modem and repeat the same procedure my WinXP machine gets a lease _instantly_. I would guess that XP tries to get a reply from one or both of the DNS-servers that the router sends along w/ the DHCP-information, but why does it take so long?
All machines except for the NSLU2 get a dhcp-lease in the range 192.168.0.10 - 192.168.0.20 (255.255.255.0)
2. Browsing SMB-shares from my NSLU2 (for the first time) takes ages. Seems like XP is trying to resolve something in the background. I wait for about 20 seconds before anything is displayed. The phenomenon does not occur when browsing smb-shares using a mac os x machine.
3. Xbox MediaCenter cannot connect to the smb-shares on the nslu2 - as long as the WRT54G is connected to the internet. This is not a joke. I disconnect the router from the internet and I can browse my shares again. The problem goes further: If I use any file, say, I stream a movie, the router will not connect to the internet until I disconnect the client.
4. FTP to a server in the LAN only works in passive mode!
I thought that maybe I changed some setting on my clients so I hooked up my old cheap router just to find everything working properly again. Unfortunately linksys was not able to help me in this matter (I am still waiting for a response) - all they told me was that this shouldn't be the case because the WRT54G has a plain simple 4-port switch.
I have tried flashing various firmwares + performing hard-resets + revert to factory settings and starting all over several times.
I also found out that it doesn't matter wether its wireless or not so bothering with wireless security settings won't help anything.
Pinging the hosts on the LAN works. All clients can access the internet. It seems odd that I can access the internet and not be able to connect to an internal server, doesn't it?!
Has anyone had a similar experience? I would greatly appreciate any advice on this.Message Edited by appleholic on 07-05-2006 10:32 AM

Ok, I seem to have resolved the problem, though I'm not 100% sure how what I did resolved it.
I returned what appeared to be a defective unit to the store today and exchanged it for a new one. Got the new one home, got it plugged in and powered on and had exactly the same problem. I did notice that like the first unit, when the pings from the internal LAN would fail, the response about the TTL expiring in transit appeared to be coming from 192.168.1.196 which is the IP address assigned to my Linksys RT31P2 which is one of the two Vonage devices on my network (and which also happens to be a router though I'm not using it as such).
If I disconnected the RT31P2 from my network, the WRVS4400N worked as it should in that I could still ping the internal interface and access the web management pages while it was connected to the WAN. As soon as I plugged the RT31P2 back into my network, the WRVS4400N would exhibit exactly the same behaviour as before (no ping and no access to web management while connected to the WAN).
I can't recall exactly why but I did have the RT31P2 cabled up kind of weird. I had a cable running from the Internet port on the RT31P2 to one of the LAN ports on it, and had another cable from a switch connected to a second LAN port on the RT31P2. I've since recabled the RT31P2 such that I now have a cable from the switch connected to the Internet port on the RT31P2 and my Vonage line is up, and the WRVS4400N is still working as expected.
Bizzarre.

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