Come to think of it, setting
dialup-watcher=active
seems viable too. I'm on cable so i've no experience with this.
Dialup-link detection:
0) Off: the client will send/receive packets only when it needs to do so.
1) Dial-up detection mode: This acts like mode 0, with the addition
that the client will automatically send/receive packets when a
dial-up networking connection is established. Modem users
will probably wish to use this option so that their client
never runs out of packets.
2) Dial-up detection ONLY mode: Like the previous mode, this will cause
the client to automatically send/receive packets when
connected. HOWEVER, if the client runs out of packets,
it will NOT trigger auto-dial, and will instead work
on random RC5 packets until a connection is detected.
option 1 is active
option 2 is passive.