Re: ARP message padding

[Roy Marples <roy%marples.name@localhost>]

On Saturday 12 July 2008 13:33:09 David Laight wrote:
> On Sat, Jul 12, 2008 at 11:46:31AM +0100, Roy Marples wrote:
> > Hi list!
> >
> > Whilst working on the IPv4LL part of dhcpcd, I was wondering why some
> > frames I was capturing were 60 bytes and some were 42 - which was the
> > size I was expecting. After some research, I find about minimum ethernet
> > frame size which is 64, including the 4 byte crc.
>
> Quite possibly you are capturing transmit packets before they get padded.
> TX padding may be done by hardware MAC unit, or the low levels of the
> ethernet driver.

More research shows that every source I can find does not pad and neither does 
a direct capture on devices I can, leaving it to something else (driver, OS, 
hardware, etc).

Sorry for noise :)

Thanks

Roy