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Date:      Thu, 01 Aug 2013 01:23:46 +0800
From:      Julian Elischer <julian@freebsd.org>
To:        Karl Pielorz <kpielorz_lst@tdx.co.uk>
Cc:        freebsd-hackers@freebsd.org
Subject:   Re: Stacking lots of IP's on a single box - any 'gotchas'?
Message-ID:  <51F94822.4020005@freebsd.org>
In-Reply-To: <34C668004A0D654205D0516B@Mail-PC.tdx.co.uk>
References:  <34C668004A0D654205D0516B@Mail-PC.tdx.co.uk>

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On 7/31/13 5:37 PM, Karl Pielorz wrote:
>
> 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?


all on one interface?
do you really need so many addresses?
what are you trying to achieve?
you can make a machine accept work for many addresses without actually 
assigning those addresses to any interface on the machine (see ipfw fwd)

>
> Thanks,
>
> -Karl
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