[Soci SLIP] problema di connessione ad internet

[Mario Raviol]

ciao,
utilizzo firefox e tunderbird e non capisco perchè quando mi scollego e 
riavvio non mi è più possibile la connessione se non lanciando 
"ppoeconf" ogni volta.
cosa posso fare per evitare questo?
non so se è utile ma quando digito "dmesg" questo è il risultato:
> in use)
> [   24.764505] apm: BIOS version 1.2 Flags 0x07 (Driver version 1.16ac)
> [   24.764514] apm: overridden by ACPI.
> [   24.929594] ppdev: user-space parallel port driver
> [   27.694328] Bluetooth: Core ver 2.13
> [   27.697384] NET: Registered protocol family 31
> [   27.697391] Bluetooth: HCI device and connection manager initialized
> [   27.697397] Bluetooth: HCI socket layer initialized
> [   27.724802] Bluetooth: L2CAP ver 2.11
> [   27.724809] Bluetooth: L2CAP socket layer initialized
> [   27.747349] Bluetooth: SCO (Voice Link) ver 0.6
> [   27.747356] Bluetooth: SCO socket layer initialized
> [   27.784231] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
> [   27.784238] Bluetooth: BNEP filters: protocol multicast
> [   27.809602] Bluetooth: RFCOMM socket layer initialized
> [   27.809966] Bluetooth: RFCOMM TTY layer initialized
> [   27.809972] Bluetooth: RFCOMM ver 1.10
> [   27.850033] Bridge firewalling registered
> [   29.827269] pci 0000:01:00.0: PCI INT A -> GSI 16 (level, low) -> 
> IRQ 16
> [   30.042887] [drm] Initialized drm 1.1.0 20060810
> [   30.064075] [drm] Initialized radeon 1.29.0 20080528 on minor 0
> [   30.272183] agpgart-via 0000:00:00.0: AGP 3.5 bridge
> [   30.272213] agpgart-via 0000:00:00.0: putting AGP V3 device into 8x 
> mode
> [   30.272263] pci 0000:01:00.0: putting AGP V3 device into 8x mode
> [   30.638269] [drm] Setting GART location based on new memory map
> [   30.638286] [drm] Loading R200 Microcode
> [   30.638325] [drm] writeback test succeeded in 1 usecs
> [   33.512027] eth0: no IPv6 routers present
> [  123.360384] ppdev0: registered pardevice
> [  123.408662] ppdev0: unregistered pardevice
> [  125.445196] ppdev0: registered pardevice
> [  125.500410] ppdev0: unregistered pardevice
> [  125.756203] ppdev0: registered pardevice
> [  125.804060] ppdev0: unregistered pardevice
qualcuno può aiutarmi?
grazie
mario