Comment 4 for bug 228953

Summary of discussion: Harald will sniff a session to the switch with Windows and with Ubuntu, then will look for differences. Although MTU might be affecting, I am not sure which direction is sending most data (the sniffer snapshot only shows zero-window packets, and it is unclear why they are being sent; there is a suggestion of single-byte packets from the switch -- port 3268 is the switch; the seq/ack values are sort of weird...).