From owner-freebsd-net Mon Jul 30 9: 1:38 2001 Delivered-To: freebsd-net@freebsd.org Received: from purus.tcoip (unknown [200.199.244.162]) by hub.freebsd.org (Postfix) with ESMTP id 762DC37B419 for ; Mon, 30 Jul 2001 09:01:32 -0700 (PDT) (envelope-from daniel.sobral@tcoip.com.br) Received: from tcoip.com.br (9lki25i471fth56p@dcs.intra.tcoip.com.br [192.168.60.194]) by purus.tcoip (8.11.1/8.11.1) with ESMTP id f6UFwbA08411; Mon, 30 Jul 2001 12:58:37 -0300 Message-ID: <3B65842C.90407@tcoip.com.br> Date: Mon, 30 Jul 2001 12:58:36 -0300 From: "Daniel C. Sobral" User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:0.9.2) Gecko/20010705 X-Accept-Language: en, pt-br, ja MIME-Version: 1.0 To: Bill Fenner Cc: net@freebsd.org Subject: Re: TCP window and vlans References: <200107301509.IAA15303@windsor.research.att.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit 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 Bill Fenner wrote: > Are the VLAN interfaces trunked on the FreeBSD side (i.e. vlanN)? Yes. > Are you getting bitten by the device driver dropping large frames > (VLAN trunks need a higher MRU/MTU, which no drivers seem to support; > see http://www.euitt.upm.es/~pjlobo/fbsdvlan.html for if_fxp patches) I don't know about these patches. Someone said to me just setting mtu for vlan to 1500 would work with an fxp. Before that I had tried increasing the maximum size of the ethernet. Both things seemed to work (large pings went ok). Anyway this doesn't seem to match with the symptoms. Things stop being transmitted only when the receiver side sends a window size smaller than the average packet, and the buffer of the connection gets filled up. > If you set the MTU to 1496 do things get better? No because if I do that all my routing goes to outer space and I wouldn't be able to send a single packet. -- Daniel C. Sobral (8-DCS) Daniel.Sobral@tcoip.com.br dcs@newsguy.com dcs@freebsd.org capo@notorious.bsdconspiracy.net What PROGRAM are they watching? To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message