Re: Proxy ARP

[Joerg Sonnenberger <joerg%bec.de@localhost>]

On Wed, Aug 07, 2019 at 08:01:23AM -0700, Andy Ruhl wrote:
> On Tue, Aug 6, 2019 at 5:39 PM Robert Elz <kre%munnari.oz.au@localhost> wrote:
> > be forwarded to it - it is (was) mostly used in the early days of
> > ARP when not all hosts supported that new protocol, and a host that
> > did use ARP was attempting to communicate with one which did not.
> 
> I'm hoping someone will indulge me for a few minutes. I'm trying to be
> a "network guy" in the real world. I went to Roy's page for parpd and
> then read part of the RFC he points to as the reason for parpd's
> existence.
> 
> What is the modern need for this?

My use case was getting an IPv4 /29 block to be shared with some public
services and an office network. The services were running as virtual
machines, so the alternative was using a bridge on the upstream
interface or proxy ARP with normal routing. The latter was actually
easier to handle.

Joerg