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Date:      19 Aug 2005 08:57:16 -0400
From:      Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
To:        freebsd.ml@gmail.com
Cc:        questions <freebsd-questions@freebsd.org>
Subject:   Re: gif tunnel overhead
Message-ID:  <448xyyhyoj.fsf@be-well.ilk.org>
In-Reply-To: <ded8d717050817184875296eba@mail.gmail.com>
References:  <ded8d717050817184875296eba@mail.gmail.com>

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FreeBSD MailingLists <freebsd.ml@gmail.com> writes:

> about how much (what percent) bandwidth overhead should I expect if I
> connect two hosts using a UNENCRYPTED gif tunnel over a 2Mbps
> connection?

It depends on the kind of packets you're sending.  As a corollary to
that, the overhead will probably *not* be symmetrical (in both
directions).  It also depends on how the tunnel is configured.

For maximum-size regular Ethernet packets with IPv4 over IPv4, figure
a couple of percent of overhead; for minimum-size IP packets, it will
be over 30%.  The latter case probably isn't a problem, though,
because it's unusual to fill a symmetrical-bandwidth link with
minimum-size packets.



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