Okay, I’ve been having problems with the TiBook, and I believe I have traced it to my addition of some natd and ipfw commands to the /Libary/StartupItems folder.
The symptom was a failure to start up PPPoE; actually, it did start up, but despite having a router and an IP address, I would not be able to ping anything. I did this twice: PPP at home; sleep the PowerBook; bring it to work; use automatic DHCP at office; sleep the PowerBook; bring it home; fail to start PPPoE. Logging off and on did not help.
The en0 interface would also have problems. Looked through a bunch of commands, including ps wwax | grep ppp, routed, ifconfig en0, ethereal &, etc. (By the way, if you ever need to start ethereal on a ppp0 interface from the beginning, start it when you’re already in the middle of a session, log off, then log back in. Otherwise, you won’t have access to the interface.)
Anyway, I had tried to set my TiBook up as a Software Base Station by turning it into a masquerading firewall and bridging en1 packets to the en0 interface, but, eh.
I disabled my NATd and ipfw startup commands, then iterated the home-work-home cycle. Now I am connected. Yay.
1:43:28 AM 
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