--- Richard A Steenbergen <[EMAIL PROTECTED]> wrote: > On Fri, Jan 06, 2006 at 10:02:07AM -0800, John-Mark > Gurney wrote: > > Nope, for pre-gige, only 1500 MTU is supported... > This was extended > > slightly to support vlan tagging, but I believe > many of the drivers to > > If you have a good gige card, you can go to 9000 > MTU and beyond... > Technically speaking, the problem was not fixed by > GigE or even 10GigE. > The wonderful folks over at the IEEE feel there is > no need to bring us out > of the ethernet networking dark ages by defining any > kind of standards for > anything > 1500 bytes. We're left with a bunch of > vendors who are each > trying to do the right thing by picking random sizes > ranging from 1518 > (stock + 4 bytes for a single .1q tag) to 16384, but > there are no real > standards, no mechanisms for ensuring > interoperability, no protocols for > negotiating MTUs between networks, etc. Lots of newer FastE cards > support jumbos or some kind > of mini jumbo too. There are still plenty of NICs > and switches out there > with no or very half-ass jumbo support though.
thanks for providing the insight. I would try with GigE next time. since it seems a bad option to try MTU larger than 1500 in 10/100 Mbps ethernet i tried another option to solve my problem. Now i don't add additional header(2 bytes) to distinguish the packets that were processed. I rather tried for protocol mapping. This is what i did, i mapped the protocol (in the protocol field of the ip header) 0..56 to 138..194 if compressed 0..56 to 195..251 if uncompressed with this simple protocol mapping i could only compress 57 protocol data. I guess the protocols 138 to 251 will not be used for couple of years. OR Is there any slighest possibility ???? thanks, kamal __________________________________________ Yahoo! DSL Something to write home about. Just $16.99/mo. or less. dsl.yahoo.com _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "[EMAIL PROTECTED]"