Date: Tue, 4 Jul 2000 00:37:44 -0400 (EDT) From: David Gilbert <dgilbert@velocet.ca> To: "Louis A. Mamakos" <louie@TransSys.COM> Cc: David Gilbert <dgilbert@velocet.ca>, Joerg Micheel <joerg@cs.waikato.ac.nz>, freebsd-stable@FreeBSD.ORG Subject: Re: Ethernet MTUs > 1500? Message-ID: <14689.27160.907313.347624@trooper.velocet.net> In-Reply-To: <200007040353.XAA03131@whizzo.transsys.com> References: <14689.22689.894466.908666@trooper.velocet.net> <20000704153914.C60136@cs.waikato.ac.nz> <14689.23903.87264.511506@trooper.velocet.net> <200007040353.XAA03131@whizzo.transsys.com>
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>>>>> "Louis" == Louis A Mamakos <louie@TransSys.COM> writes: Louis> There's some confusion here, because the MTU is typically Louis> associated with a protocol stack like IP and refers to the Louis> largest sized (IP in this case) packet that can be sent on the Louis> network interface. In the case of Ethernet interfaces that Louis> support and use VLAN tags, the MTU is still 1500 bytes, Louis> regardless of the fact that the frame size is a few bytes Louis> longer to accomodate the VLAN tag information. Louis> So, this has no effect on the Ethernet type field (or 802.3 Louis> length fields) since the higher level protocol packet size is Louis> unchanged. Why, then, are the vlan MTUs hardwired at 1496? Dave. -- ============================================================================ |David Gilbert, Velocet Communications. | Two things can only be | |Mail: dgilbert@velocet.net | equal if and only if they | |http://www.velocet.net/~dgilbert | are precisely opposite. | =========================================================GLO================ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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