I'm working through the Plan 9 documentation at http://plan9.bell-labs.com/wiki/plan9/documentation/index.html.
I'm running Plan 9 in QEMU in Ubuntu Intrepid Ibex.
qemu plan9jim.img -k en-us -no-reboot
term% ip/ipconfig
term% ndb/dns -r
term% ip/ping 192.168.0.1
sending 32 64 byte messages 1000 ms apart to icmp!192.168.0.1!
lost 0
lost 1
. . .
lost 31
32 out of 32 messages lost