Hello,
I just noticted something weird on my NM + MM managed LTE modem
interface: There is no IPv6 link local address:
root@miraculix:/etc# ip addr show dev wwan0
134: wwan0: <BROADCAST,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
state UNKNOWN group default qlen 1000
link/ether 3a:50:b3:ff:65:29 brd ff:ff:ff:ff:ff:ff
inet 10.236.15.139/29 brd 10.236.15.143 scope global wwan0
valid_lft forever preferred_lft forever
inet6 2a02:2121:30a:8ec9:3850:b3ff:feff:6529/64 scope global mngtmpaddr
dynamic
valid_lft forever preferred_lft forever
inet6 2a02:2121:30a:8ec9:ec6f:52f7:b166:425f/64 scope global
valid_lft forever preferred_lft forever
As expected, the addrgenmode is set to 'none', so all address generation
is supposed to be handled by NM, isn't it?
root@miraculix:/etc# ip -d link show dev wwan0
134: wwan0: <BROADCAST,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
state UNKNOWN mode DEFAULT group default qlen 1000
link/ether 3a:50:b3:ff:65:29 brd ff:ff:ff:ff:ff:ff promiscuity 0
addrgenmode none numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs
65535
The hardware here is an EM7455 in MBIM mode. I am using the Debian
1.6.2-3 version of NetworkManager along with some arbitrary "1.7.0" git
checkout of ModemManager. Let me know if you need more details.
I don't know if this could possibly cause any issues. It was just a bit
unexpected. I tried to ping ff02::1%wwan0 and expected at least one
link local reply.
And RFC4291 is pretty clear, quoting from section 2.1:
All interfaces are required to have at least one Link-Local unicast
address
Bjørn
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