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Date: Mon, 12 Jan 2004 13:18:53 -0500
From: Barney Wolff <barney@databus.com>
To: Andriy Korud <akorud@polynet.lviv.ua>
Message-ID: <20040112181853.GA20984@pit.databus.com>
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Subject: Re: NATD and available ports
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On Mon, Jan 12, 2004 at 05:45:39PM +0200, Andriy Korud wrote:
> Hi.
> I need to run nat box for ~2000 clients with up to 300.000 active connections.
> ipnat doesn't handle such load, so I'm going to try natd - but worry that natd
> will simply use all available outgoing ports and then crash.
> I have 128 public IP's and in ipnat's configuration just map smaller blocks of
> private IP's into certain public IP, but have no idea how can I do this using
> natd.

You can run multiple copies of natd, each one on its own divert socket.
ipfw rules can decide which internal machines & which external addresses
go to which divert socket.

Performance may well be an issue, depending on bandwidth.  Perhaps one
NAT box per 100 client boxes would not be overkill - is adding 1% to
the h/w budget unreasonable?

-- 
Barney Wolff         http://www.databus.com/bwresume.pdf
I'm available by contract or FT, in the NYC metro area or via the 'Net.