>>>>> "Kevin" == Kevin Oberman <[EMAIL PROTECTED]> writes:
Kevin> Louis has it exactly right. 802.3 was modified a couple of
Kevin> years ago to allow for a maximum frame size of 1522 octets, up
Kevin> from the original 1518. This was to allow the VLAN information
Kevin> to fit in the frame.
Kevin> Since the terminating switch/router should be removing this
Kevin> information, the end system (and MTU) should be unaffected, but
Kevin> many nets seem to not fully support the longer frames in their
Kevin> infrastructure and probably lots of Internet routers don't
Kevin> either. This is often a hardware issue, so the only fixes
Kevin> available are to upgrade all hardware to support the added
Kevin> octets or to reduce the MTU so that the frame size does not
Kevin> exceed 1518.
Kevin> In an enterprise, the upgrade is feasible, but in the Internet
Kevin> backbone, if you are not extremely lucky to have all VLAN
Kevin> supporting equipment along the path, the packet is fragmented
Kevin> or dropped. And there is a LOT of equipment out there that does
Kevin> not support VLANs.
In this case, the BSD box is meant to be the terminator of the VLAN
trunks. In this case, Linux (to use the awful L word) forwards 1500
byte packets into the VLANs. I just want my FreeBSD router to do the
same.
Dave.
--
============================================================================
|David Gilbert, Velocet Communications. | Two things can only be |
|Mail: [EMAIL PROTECTED] | equal if and only if they |
|http://www.velocet.net/~dgilbert | are precisely opposite. |
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