From owner-freebsd-hackers@FreeBSD.ORG  Wed Jul 31 09:37:34 2013
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Date: Wed, 31 Jul 2013 10:37:35 +0100
From: Karl Pielorz <kpielorz_lst@tdx.co.uk>
To: freebsd-hackers@freebsd.org
Subject: Stacking lots of IP's on a single box - any 'gotchas'?
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Hi,

We've got a number of boxes we'd like to consolidate - this could mean 
upward of 1,500 IP's on a single box (9.1 amd64).

Last time we did anything like this we hit at issue at around 900 (ntpd 
'binds' by default to all available IP's - I think we had a workaround for 
that).

But is there any hard limit we're likely to encounter putting so many IP's 
on a single machine? - Are there any limits that would likely need tuning 
to support that many IP's?

Thanks,

-Karl