linux-kernel - [BUG] v4.20 - bridge not getting DHCP responses? (works in 4.19.13)

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAA85sZsiifWTKq=Mw30f-UVyrzywnYYX7GvyqG+O+ndSYBML9A@mail.gmail.com>
Date:   Sun, 6 Jan 2019 22:26:59 +0100
From:   Ian Kumlien <ian.kumlien@...il.com>
To:     linux-netdev@...r.kernel.org
Cc:     jeffrey.t.kirsher@...el.com, roopa@...ulusnetworks.com,
        nikolay@...ulusnetworks.com,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [BUG] v4.20 - bridge not getting DHCP responses? (works in 4.19.13)

Hi,

Switching from 4.19.x -> 4.20 resulted in DHCP not working for my VM:s.

My firewall (which also runs the dhcpd) runs VM:s and it does this by
having physical
interfaces attached to bridges - which the VM:s in turn attach to.

Since 4.20 the VM:s can't use DHCP, it's odd since the requests are
seen - a response is sent but
it never enters the interface attached to the bridge.

Basically:
VM vnet2: -> br0 -> eno2 -> switch -> eno1 (dhcpd)
dhcpd eno1 -> siwtch and... gone.

Any clues?

All the nics are handled by ixgbe