From owner-freebsd-questions Mon May 31 0:38: 5 1999 Delivered-To: freebsd-questions@freebsd.org Received: from zeus.dnt.md (zeus.dnt.md [195.138.124.37]) by hub.freebsd.org (Postfix) with ESMTP id 6AF0414CA2 for ; Mon, 31 May 1999 00:37:50 -0700 (PDT) (envelope-from sl@zeus.dnt.md) Received: from localhost (sl@localhost) by zeus.dnt.md (8.9.3/8.9.3) with ESMTP id KAA61818 for ; Mon, 31 May 1999 10:35:24 GMT Date: Mon, 31 May 1999 10:35:24 +0000 (GMT) From: slava To: freebsd-questions@freebsd.org Subject: [off-topic] DF bit and IP Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Hi Does TCP always gets encapsulated in an IP header with DF bit set? I know this is needed for path MTU discovery to make tcp more efficient but is this implemented on all OSes? What if something in the way is blocking the icmp packet-too-big type to the initiator of a TCP connection and it never finds out about a small MTU in the path? Will it retry with a smaller MTU itself? thanks slava To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message