In [a previous post|blog/20080828/tethered-dialup-with-eeepc-palm-755p-and-alltel], I wrote about setting up a tethered dial-up connection using a Palm Treo 755p and an eeePC.
It seems that during the upgrade process from Ubuntu 8.04 (Hardy) to 8.10 (Intrepid), something changed in the networking modules and broke this...a little bit.
The problem was that after the upgrade) the system was holding onto the 'default gateway' of my wired connection, even after dialing up the ppp connection, so it wasn't properly routing requests (trying to send requests through the ppp network, via the the wired default gateway).
I found [this post|https://lists.ubuntu.com/archives/ubuntu-za/2008-February/001240.html] where a suggestion to include 'replacedefaultroute' in ppp-script-treo solved the problem.