1) Have you any port forwarding rules set up for the PS3?
2) Are you assigning the same IP address to the ethernet adapter that was used by the wireless?
The MAC address is unique to each adapter so the only reason I can think that the router may be locking up the ethernet ports would be if you are assigning the same IP to a different MAC. That said, I wouldn't have expected it to lock up the ethernet ports completely. I would have expected a router restart should clear the MAC address table though without the need to factory reset the modem.
Removed the port forward and change to an unused IP address. Also tried DHCP but same problem, I've checked the lease pool and its not there, but I may wait a few days to ensure it's been released as I really don't want have to reconfigure the modem again.
I've reset the router to factory standard and reconnected device by device. PS3 connected fine this time. Everything was looking good until I connected the AirPort Express, then everything died on the network again. So it appears to be a conflict when both AirPort Express and PS3 are connected, very very odd.
I now have the wired network operational, to an extent. I cannot run 4 (four) concurrent Gbit connections with a 100Mbit connection. So I now have 3 (three) Gbit and 2 (two) 100 Mbit connections.
My assertion is that the Apple AirPort Express 100 Mbit bridge overloads the 4 port Gbit switch build into my aDSL router somehow, although I don't the networking knowledge needed to valid/refute this.
The only thing I can think of would be if the switch fabric was being overloaded. If you are just using a standard dsl router it probably would have negligible (if any) switch fabric. It would be interesting to see if it could be replicated.
What is the setup you were using? An older Airport Express connected via the ethernet port to what router? How many devices would normally be connecting to the airport and then to the computers on the router?
Wired to the router I have a hyper visor (Gigabit), AirPort express (current generation with two Ethernet ports, to the second port I had the PVR connected, 10/100), Media Centre (Gigabit) and I wanted to connect the PS3 (Gigabit). I had to connect the PVR to the switch directly, then the PS3 to the AirPort Express, which drops it to 10/100 to this configuration to work.
The AirPort express is acting as a wireless access point, providing a separate SSID to that provided by the router.
Note: as one connection is to a Hyper-V hyper visor, it is therefore connecting a virtual switch to the router, which in turns has a few VM connections.
Try leaving wireshark running on one of the switchports when the lockup occurs. It could be a network storm of some sort. Another indication would be the tx/rx lights leds on the ports lighting up solid rather than flickering.
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