From owner-freebsd-net Wed Aug 8 13:23:29 2001 Delivered-To: freebsd-net@freebsd.org Received: from starfruit.itojun.org (host217-33-137-35.ietf.ignite.net [217.33.137.35]) by hub.freebsd.org (Postfix) with ESMTP id 5E0AE37B410 for ; Wed, 8 Aug 2001 13:23:20 -0700 (PDT) (envelope-from itojun@itojun.org) Received: from itojun.org (localhost [127.0.0.1]) by starfruit.itojun.org (Postfix) with ESMTP id D20C77BB; Thu, 9 Aug 2001 05:22:47 +0900 (JST) To: Mike Tancsa Cc: Jeroen Ruigrok/Asmodai , freebsd-net@freebsd.org In-reply-to: mike's message of Wed, 08 Aug 2001 15:51:49 -0400. <5.1.0.14.0.20010808155054.04d25380@marble.sentex.ca> X-Template-Reply-To: itojun@itojun.org X-Template-Return-Receipt-To: itojun@itojun.org X-PGP-Fingerprint: F8 24 B4 2C 8C 98 57 FD 90 5F B4 60 79 54 16 E2 Subject: Re: gif MTU of 1280 ? From: Jun-ichiro itojun Hagino Date: Thu, 09 Aug 2001 05:22:47 +0900 Message-Id: <20010808202247.D20C77BB@starfruit.itojun.org> Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org >> 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 ? private/global address doesn't change the situation at all. itojun To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message