netdev - Re: dsa: mv88e6xxx losing DHCPv6 solicit packets / IPv6 multicast packets?

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Message-ID: <0538958b-44b8-7187-650b-35ce276e9d83@elloe.vision>
Date:   Fri, 24 Jul 2020 11:24:53 +0100
From:   "Tj (Elloe Linux)" <ml.linux@...oe.vision>
To:     netdev@...r.kernel.org
Cc:     chris.packham@...iedtelesis.co.nz, andrew@...n.ch,
        f.fainelli@...il.com, marek.behun@....cz, vivien.didelot@...il.com
Subject: Re: dsa: mv88e6xxx losing DHCPv6 solicit packets / IPv6 multicast
 packets?

> As another thought do you know what DHCPv6 client/server is being
> used.
> There was a fairly recent bugfix for busybox that was needed because
>the v6 code was using the wrong MAC address.

I'm the customer experiencing this issue. It appears unrelated to the
DHCP server software. On the Turris Mox with Debian 10 we have
isc-dhcp-server 4.4.1-2. Clients are Xubuntu 20.04 withNetworkManager
1.22.10-1ubuntu2.1 using isc-dclient 4.4.1-2.1ubuntu5.

Quoting from another email I sent to Turris:

We've now done more testing and CONFIRMED the Mox is losing DHCPv6
solicit packets.

Specifically, it seems the 88E6190 hardware switches in the Peridot
module is swallowing IPv6 multicast packets (sent to ff02::1:2 ).

We tested this by mirroring the Mox LAN port on an external switch and
saw the DHCPv6 solicit packet egress the switch but the Mox kernel
didn't see it ingress (using tcpdump).