Date: Mon, 30 Jul 2001 12:58:36 -0300 From: "Daniel C. Sobral" <daniel.sobral@tcoip.com.br> To: Bill Fenner <fenner@research.att.com> Cc: net@freebsd.org Subject: Re: TCP window and vlans Message-ID: <3B65842C.90407@tcoip.com.br> References: <200107301509.IAA15303@windsor.research.att.com>
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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
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