diagnosis
Replying to my own question ...
I found that the WET610N is recomputing the TCP checksum. (I can't imagine why.) When the packet is shorter than the ethernet minimum (64 bytes total, 46 bytes IP+TCP+payload), the 610 includes the ethernet padding in the checksum. The checksum...
I got a WET610N last Saturday to connect some computers upstairs to the house net through the existing D-Link DI-624 access point downstairs. Setup of the SSID and key was pretty easy. I have used the 610 by connecting a single computer with Cat-5 and by connecting it to a little 5-port switch...