Martin Mokrejs <mmokrejs@xxxxxxxxxxxxxxxxxx> writes: > I haven't managed to get the wwan0 really working yet but it seems that my > modem crashes if I have an IP address assigned to wwan0 interface and the > interface is UP while I want to use ppp connection. The modem connects when > asked by pppd, receives an IP via DHCP, and connection works for about 30 sec. > Then it probably wants to negotiate something and "crashes?" (LED goes from > cyan to dark blue). Interesting. Haven't tested that. Sounds likely that the modem firmware is unable to handle ppp and ethernet emulation simultaneously. > I found out if I do "ifconfig wan0 down" before starting pppd the connection > is stable for hours. Probably the USM modem is fooled when having both interfaces > enabled. I did not have these problems before because I did not fiddle with wwan. > ;) Should only either one interface be exposed by modem's firmware? Should > userspace tools treat them mutually exclusive interfaces? Ideally the modem firmware should have handled this gracefully, but I don't expect that to really happen... So the userspace tools should treat the interfaces as mutually exclusive. I believe that is the idea behind ModemManager grabbing *all* ports on a modem. It needs to enforce such constraints, which may just as well affect multiple serial ports (ever tried running ppp on more than one of the serial ports?) Bjørn -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
