Re: PPPoE Modem hangup after random time - how to debug?

David Balažic
2020-05-06T15:39:20Z

On Wed, 6 May 2020 at 16:26, Guillaume Nault <gnault@redhat.com> wrote:
>
> On Wed, May 06, 2020 at 11:52:48AM +0200, David Balažic wrote:
> > On Mon, 4 May 2020 at 20:12, Guillaume Nault <gnault@redhat.com> wrote:
> > >
> > > On Mon, May 04, 2020 at 06:36:48PM +0200, David Balažic wrote:
> > > > On Mon, 4 May 2020 at 15:01, Guillaume Nault <gnault@redhat.com> wrote:
> > > > > You can use "%pM" for printing MAC addresses. Also, it'd be interesting
> > > > > to have information about promisc mode:
> > > > > "dev %s, flags: %#x, promiscuity %u",
> > > > > dev->name, dev->flags, dev->promiscuity,
> > > >
> > >
> > > > I'll report later values printed when a stray PADT appears.
> > > >
> > > Okay, but please keep printing the destination MAC address of the
> > > packet. I was providing the flags/promiscuity string just to get extra
> > > information, not to replace your original log.
> >
> > This was logged now:
> >
> > (all at May 6 05:34:50 2020 UTC)
> > pppoe_disc_rcv PADT received, sid=1, SRC: a4:7b:2c:9e:c7:44, DST:
> > 44:4e:6d:fd:c7:39
> > pppoe_disc_rcv PADT received, own hw addr: c4:XX:XX:XX:XX:ed
> > dev eth1.3902, flags: 0x1003, promiscuity 0
> > pppoe_disc_rcv PADT received, not four our address, ignoring
> >
> > (the last line is from my fix, the connection is now not dropped when
> > the PADT is not for us; works fine, my connection stays up and
> > working)
> >
> Looks like a more fundamental issue. This frame shouldn't have been
> accepted in the first place. Can you also print the packet class
> ("... pkt_type %u", ..., skb->pkt_type)?

After fixing it, the priority of this issue really dropped on my task list.
Maybe someone has a similar hardware and can test?

It is an Atheros AR7161 SoC. (full HW info on the openwrt.org pages,
look for Netgear WNDR3700v2)