Bug on 3G pen: is it from kernel or modem-manager?

[Pedro Francisco]

Hi!
I've a less common 3G pen (yay for Vodafone exclusives) which requires
`ifconfig usb0 -arp` to work properly.
I've filled both a bug on Ubuntu and Fedora. On Ubuntu I've been told
it's a kernel issue; on Fedora, I've been said nothing.
Since I've connected each bug on each bugtracker to the other, and one
says it's a linux bug and the other a modem-manager bug, I've decided
to request some advice here.


On a quick guess, do you think it is a kernel bug or a modem-manager bug?


Fedora bug: https://bugzilla.redhat.com/show_bug.cgi?id=729952
Ubuntu bug: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/764003
3G modem: Vodafone k3805-z [ZTE custom modem, 19d2:1003 after modeswitch]

Thanks in Advance!
-- 
Pedro