I used my mk2 as a packet-sniffer when trying to debug the DHCP server in the Central. I couldn't get tcpdump to actually parse the packets properly -- some kind of alignment issue, I guess. Presumably that works now? So I captured the packets to a file and then viewed them in ethereal on a Linux box.

BTW, Ethereal on Win32 actually works. Which came as quite a shock to me when I tried it recently.