Best way for an app to accept traffic on 30,000+ interfaces?

[Ermal Luçi]

On Thu, Mar 21, 2013 at 1:59 AM, Mark D <markd-freebsd-net at bushwire.net>wrote:

> (Hopefully this isn't too out-of-scope for this list..)
>
> I have an application in mind that I'd like to have accept/respond to
> UDP queries sent to perhaps 30K contiguous IP addresses (most likely
> IPV6 addresses because such ranges are easy to come by, but
> conceptually ipv4 as well).
>
> This would all be on a small number of FBSD instances.
>
> Though it could be done, I don't really want to create 30K interfaces
> and have the application bind 30K sockets as it's not clear if that
> will scale if I try an address range that expands to, say, 1M IPs
> wide.
>
> This address range would be internet-facing and responding to random
> remote clients.
>
> My first thought is to use SOCK_RAW in much the same way that natd
> does - at least to receive the traffic.
>
> Is that a sensible and viable approach or is there a better/easier
> way?
>
>
> Mark.
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How about firing up one of the firewall/pfil(9) consumers like (ipfw/pf)
and adding rules to redirect traffic to a socket bound on loopback?

-- 
Ermal