Date: Sat, 16 Jul 2005 16:50:08 -0500 From: Nikolas Britton <nikolas.britton@gmail.com> To: FreeBSD - Questions <freebsd-questions@freebsd.org> Subject: Can I use jumbo frames on my LAN? Message-ID: <ef10de9a050716145039d37262@mail.gmail.com>
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Is it true that jumbo frames are only useable with VLANs or LANs that are 100% GigE? The current LAN has a 16port 100Base-TX switch with a mix of 10/100 devices connected to it. 4 of the machines connected to the switch have built-in GigE support and their usage profile can take full advantage of it, so I'm going to be adding a 8port GigE switch to the current setup. The server, 4 workstations, and the old switch will be connected to this new switch. None of the switches supports 802.1q and the systems are all on the same subnet anyways. So if I tell my FreeBSD server that I want to use 9000 byte frames what happens to my other 10 and 100base-TX systems on the old switch? Does FreeBSD dynamically change it's mtu size based on the system it's talking to or will it always speak 9000 bytes at a time? My educated guess is that it always speaks 9000 bytes at a time and therefore I can't use jumbo frames on my network, it will screw up my 10 and 100base-TX systems. Am I right?
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