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Date:      Tue, 8 Jul 2003 20:08:08 -0500
From:      Dan Nelson <dnelson@allantgroup.com>
To:        Brent Wiese <brently@bjwcs.com>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: NAT and MTU
Message-ID:  <20030709010808.GA39506@dan.emsphone.com>
In-Reply-To: <0b9001c345b3$4ac98850$0a0114ac@home.bjwcs.com>
References:  <0b9001c345b3$4ac98850$0a0114ac@home.bjwcs.com>

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In the last episode (Jul 08), Brent Wiese said:
> I have a machine that is being double-NAT'd.
> 
> Would it make sense to set the MTU lower to account for the NAT
> overhead?
> 
> It makes sense to me as I know MTU, but I like to check in case my
> thinking isn't right. :)

There is no overhead; all NAT does is rewrite IP addresses in the
header (and in some data packets of certain protocols like FTP).  It
adds no extra data.

-- 
	Dan Nelson
	dnelson@allantgroup.com



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