Hi, a short description of the situation: focus is on IPv6 3.12: start of Modemmanager and device plugged in little bit waiting then the "trick" because of arp/noarp/nd-problem: "ifconfig wwan0 arp" mmcli --simple connect.... confirmed with ok /sbin/ip link set wwan0 up got addresses dhclient -v -6 -S wwan0 (replied, but without DNS, not relevant here) I set /etc/resolv.conf manually. It works. regular disconnect works too 3.13 RC2 (self compiled , as well built by suse "HEAD") start of Modemmanager and device plugged in little bit waiting mmcli --simple connect.... modem seems to connect because of the LED-status, but modemmanager says transaction time out /sbin/ip link set wwan0 up without effect. Also "simple disconnect" does not work. So I think there are problems at both interfaces wwan0 and /dev/cdc-wdm0. Modemmanager and libmbim from todays git, equal in all tests. Regards, Thomas -- 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