My university provides IPv6 access thru ISATAP protocol and instructions on how to use it on Windows/Linux. Unfortunately Mac OS X is not on the support list and I found it seems that Leopard comes with no ISATAP support by default.
After a lot of searching on internet, I found that there's a software named miredo which would possibly support ISATAP client on OS X. I compiled miredo 1.1.5 under the help of someone in miredo mailing list. However I can't get isatapd provided by miredo working correctly.
I checked isatapd and isatapd.conf manual by the man command. Here's my conf file(/usr/local/etc/miredo/isatapd.conf):