Re: CARP misbehaving on RPi2+ / RPI3

[Greywolf <relayer%gmail.com@localhost>]

Ah, okay -- that makes some sense.  Glad to know it's not (just) me.
:)  Thank you!

On Sun, Mar 26, 2023 at 3:56 AM Michael van Elst <mlelstv%serpens.de@localhost> wrote:
>
> relayer%gmail.com@localhost (Greywolf) writes:
>
> >Greetings; I have a couple RPi that I will refer to here as 'thing1'
> >and 'thing2'.  Both are running evbarm-earmv7h, NetBSD 10-BETA.
>
> The carp driver sent advertising packets through the carp interface
> which sets the source MAC address to the CARP virtual MAC address
> (computed from the vhid value).
>
> A normal ethernet switch will then learn that this MAC address
> exists on multiple ports and change its forwarding table all
> the time, resulting in lots of packet drops. The CARP election
> protocol then doesn't work.
>
> I have comitted a change to send advertisments through the backing
> 'carpdev' interface instead. This uses its own distinct MAC
> address, and the switch stays happy.
>
> With the consumer switches here, it still takes up to 20 seconds to notice
> when CARP moves the virtual MAC address to the other machine.
>


-- 
--*greywolf;