Date: Wed, 08 Aug 2001 15:51:49 -0400 From: Mike Tancsa <mike@sentex.net> To: Jun-ichiro itojun Hagino <itojun@iijlab.net>, Jeroen Ruigrok/Asmodai <asmodai@wxs.nl> Cc: freebsd-net@freebsd.org Subject: Re: gif MTU of 1280 ? Message-ID: <5.1.0.14.0.20010808155054.04d25380@marble.sentex.ca> In-Reply-To: <20010808194325.D1B9E7BB@starfruit.itojun.org> References: <asmodai's message of Wed, 08 Aug 2001 18:14:54 %2B0200. <20010808181454.Q2937@daemon.ninth-circle.org>
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At 04:43 AM 8/9/01 +0900, Jun-ichiro itojun Hagino wrote:
> as others noted, if you set gif MTU to 1500, then you will see a lot
> of fragmented packet exchanges (= poor performance). if you use
> IPv4 as the outer header, MTU <= 1480 avoids fragmentation and
> more performant. as 1280 <= 1480, we avoid fragmentation with the
> current default configuration.
If the Internal IPs are RFC 1918, will hinder PMTU ? Am I better off to
use real ones on the inside ?
---Mike
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