dhcpcd-discuss

On Mon, Aug 19, 2019 at 10:04 AM Yegor Yefremov
<yegorslists@xxxxxxxxxxxxxx> wrote:
>
> On Fri, Aug 16, 2019 at 5:34 PM Roy Marples <roy@xxxxxxxxxxxx> wrote:
> >
> > Hi Yegor
> >
> > On 16/08/2019 10:30, Yegor Yefremov wrote:
> > > Hi Roy,
> > >
> > > some recent QMI modems work only in "raw-ip" mode [1], [2]. So far,
> > > only udhcpc can acquire dynamic IP address via this protocol.
> > >
> > > What do you think about adding support for this protocol?
> > >
> > > [1] https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-class-net-qmi
> > > [2] http://www.embeddedpi.com/documentation/3g-4g-modems/raspberry-pi-sierra-wireless-mc7455-modem-raw-ip-qmi-interface-setup
> >
> > Unsure how udhcpc works and dhcpcd doesn't.
> > If an IP address isn't set, udhcpc spits out a L2 address still:
> > https://git.busybox.net/busybox/tree/networking/udhcp/packet.c
> >
> > Can you provide logs of dhcpcd not working on one, or access to such a
> > device via ssh?
>
> # dhcpcd wwan0
> wwan0: unsupported interface family 00
> wwan0: waiting for carrier
> wwan0: carrier acquired
> DUID 00:01:00:01:c7:92:bc:92:74:6a:8f:ff:50:55
> wwan0: IAID 00:00:00:06
> wwan0: using static address 169.254.227.48/16
> arp_open: wwan0: Invalid argument
> arp_announce: Invalid argument
> forked to background, child pid 354
>
> This is how the interface looks like:
>
> # ip addr show wwan0
> 6: wwan0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc
> pfifo_fast state UNKNOWN group default qlen 1000
>     link/none
>     inet 169.254.227.48/16 brd 169.254.255.255 scope global noprefixroute wwan0
>        valid_lft forever preferred_lft forever
>
> And this is what happens with udhcpc:
>
> # udhcpc -i wwan0
> udhcpc: started, v1.31.0
> udhcpc: sending discover
> udhcpc: sending select for 10.50.235.7
> udhcpc: lease of 10.50.235.7 obtained, lease time 7200
> deleting routers
> adding dns 62.109.121.17
> adding dns 62.109.121.18

These is a little bit more info on the modem-manager mailing list [1].

[1] https://lists.freedesktop.org/archives/modemmanager-devel/2019-August/007360.html

Yegor