On Wed, 17 Nov 2010 16:23:54 -0500 Brandon Kim <brandon....@brandontek.com> wrote:
> > Jack brings up a good point. MTU is basically pointless since packets never > traverse any real interface....... > So in theory the size can be anything... > > Not quite. You hit packet length field limits. IPv4 packets can't be larger than 65535, and IPv6 packets also can't be larger than 65 576 (40 byte IPv6 header + 2^16 payload), unless the jumbograms and the jumbo payload extension header is supported. Last time I checked, by setting the loopback MTU > 65 576, Linux, for example, doesn't support the jumbo payload extension header (or if it does, I didn't spend enough time finding out how to switch it on - a very large MTU didn't trigger it). That being said, with a 64K MTU on loopback, you can legitimately claim to get >10Gbps at home, as long as you don't mention how you're doing it ;-) Regards, Mark.
