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From: "Mark D" <markd-freebsd-net@bushwire.net>
To: freebsd-net@FreeBSD.org
Subject: Re: Best way for an app to accept traffic on 30,000+ interfaces?
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On 20Mar13, Juli Mallett allegedly wrote:
> Well, the easiest thing is to add 30k aliases to your Ethernet
> interface (you may hit a limit, not sure) and then just listen on
> INADDR_ANY (or the IP6 equivalent), assuming you don't mind listening
> to other addresses you have configured as well.  The application can
> always decide to close an incoming connection that wasn't going to one
> of those 30k IP addresses.

Agreed that INADDR_ANY will fix the socket count. But what of the
interface/alias count? Is 300K ok? How about 3M aliases?

I'll spin up an instance and try it out, but I'm a little worried that
there might be something non-linear or some threshold limit that won't
necessarily be exposed by a modicum of adhoc testing.


Mark.