Reverted the removal of timer in r334 because of a regression in the session protocol.
tree5c750bd52ffcb4ecd23f999fbcc5262c3f7bc76d
drwxr-xr-x - ipn
drwxr-xr-x - kernel-patch-ipn
drwxr-xr-x - vde-2
drwxr-xr-x - vdetelweb