linux user group brescia

Ho deciso di passare dalla RH 9.0 a FC3. Solo che questa volta anzichè
fare un aggiornamento, ho ripulito la macchina e fatto installazione da
zero. Sul portatile invece c'è la FC2.
Dopo aver configurato un modem esterno 56k con kppp e aver constatato
che dopo che compone il numero del provider comincia la transazione e
pare che si debba collegare, invece cade la linea con un errore.
Dopo mille prove, ho verificato che se disattivo la scheda ethernet
(/sbin/ifconfig eth0 down), kppp riesce a collegarsi. Qualcuno sa dirmi
come fare per lasciare la scheda di rete attiva in modo di far
condividere il collegamento con un altro PC in rete (masquerading) come
ho sempre fatto?

Allora, questo sono i messaggi di kppp con la scheda ethernet attiva:

$ /usr/sbin/kppp
Opener: received SetSecret
Opener: received SetSecret
Opener: received OpenLock

Opener: received OpenDevice
Opener: received ExecPPPDaemon
In parent: pppd pid 3322
Opener: received OpenResolv
Couldn't find interface ppp0: No such device
Couldn't find interface ppp0: No such device
Kernel supports ppp alright.
Couldn't find interface ppp0: No such device
pppd: By default the remote system is required to authenticate itself
pppd: (because this system has a default route to the internet)
pppd: but I couldn't find any suitable secret (password) for it to use
to do so.
pppd: (None of the available passwords would let it use an IP address.)
It was pppd that died
pppd exited with return value 1
Sending 3318 a SIGUSR1
Opener: received RemoveSecret
Opener: received RemoveSecret
Opener: received OpenResolv
Opener: received OpenResolv
Opener: received RemoveLock
Opener: received PPPDExitStatus
Opener: received PPPDExitStatus
Opener: received OpenSysLog

invece questi sono con la scheda di rete disattiva:
$ /usr/sbin/kppp
Opener: received SetSecret
Opener: received SetSecret
Opener: received OpenLock

Opener: received OpenDevice
Opener: received ExecPPPDaemon
Kernel supports ppp alright.
In parent: pppd pid 3349
Opener: received OpenResolv
Couldn't find interface ppp0: No such device
Opener: received RemoveSecret
Opener: received RemoveSecret

quindi mi scollego:

Opener: received KillPPPDaemon
In killpppd(): Sending SIGTERM to 3349
Opener: received RemoveSecret
Opener: received RemoveSecret
Opener: received OpenResolv
Opener: received OpenResolv
Opener: received RemoveLock
It was pppd that died
pppd exited with return value 5
Sending 3344 a SIGUSR1

grazie e taluego
daniel