From owner-freebsd-questions@FreeBSD.ORG Tue Nov 4 22:29:34 2008 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E485E1065675 for ; Tue, 4 Nov 2008 22:29:34 +0000 (UTC) (envelope-from brian@brianwhalen.net) Received: from numail.brianwhalen.net (numail.brianwhalen.net [66.93.34.172]) by mx1.freebsd.org (Postfix) with ESMTP id 873F88FC1E for ; Tue, 4 Nov 2008 22:29:34 +0000 (UTC) (envelope-from brian@brianwhalen.net) Received: by numail.brianwhalen.net (Postfix, from userid 65534) id 381CE28522; Tue, 4 Nov 2008 14:28:58 -0800 (PST) X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on numail.brianwhalen.net X-Spam-Level: X-Spam-Status: No, score=-2.6 required=3.0 tests=BAYES_00 autolearn=ham version=3.2.5 Received: from [127.0.0.1] (numail.brianwhalen.net [192.168.15.25]) by numail.brianwhalen.net (Postfix) with ESMTP id 805682850B for ; Tue, 4 Nov 2008 14:28:56 -0800 (PST) Message-ID: <4910CCA8.4020704@brianwhalen.net> Date: Tue, 04 Nov 2008 14:28:56 -0800 From: Brian Whalen User-Agent: Thunderbird 2.0.0.17 (Windows/20080914) MIME-Version: 1.0 To: freebsd-questions@freebsd.org References: <490FA51F.7010901@datapipe.com> <87mygfv9hi.fsf@kobe.laptop> In-Reply-To: <87mygfv9hi.fsf@kobe.laptop> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: Problems with FreeBSD X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 04 Nov 2008 22:29:35 -0000 Giorgos Keramidas wrote: > On Tue, 4 Nov 2008 11:10:25 -0200, "J MPZ" wrote: > >> Hi Paul, >> >> When my connections freeze, I open the tcpdump in other terminal. If I type >> something, type "Enter", on the terminal frozen, the tcpdump show packets, >> like that: >> >> 11:18:45.526256 IP (tos 0x0, ttl 51, id 651, offset 0, flags [DF], proto: >> TCP (6), length: 112) 189.21.230.195.20787 > 201.57.5.2.2264: P 193:241(48) >> ack 0 win 15136 > {1428:1664}> >> > [...] > > >> I'm using: tcpdump -nvvv -i ste0 host REMOTE_IP >> > > Can you try capturing the connection setup packets, so we can look at > the TCP MSS negotiation values? Starting TCPDUMP *before* one of the > connections that stall is made should capture that. > > There may be an intermediate router or firewall that blocks ICMP and > ends up breaking path MTU discovery. I've seen TCP connections > 'stall' when path-mtu was broken by a setup like this and one of the > intermediate routers started dropping TCP packets that were too large > for one of its interfaces. > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" > Since the result set is so big, something else to try may be invoking the ssh connection with compression on, -C is the flag. THis will allow us to see if it really isnt working or is just slower than you'd like. Brian