It seems that PAT support that is included in linux kernel 2.6.26 has some problems. If you are using a recent ATI Catalst (fglrx) driver
I had problems uploading files to wordpress hosted at the local machine. Conditions are: Firefox 3.0 Flash 9.0 Local squid proxy 2.7.STABLE3 Firefox setup for
Inside an Autonomous System, it is possible to move a machine inside a network, keeping its IP address even though it goes to a network
Using OS2008/Diablo in maemo (tested in N800 but should work elsewhere) it is possible to initiate (and terminate) an Internet connection from the command line.