[e2e] Ethernet Encapsulation

[Tianbo Kuang]

Dennis Rockwell wrote:

> On 7 Nov, Greg Minshall wrote:
>
> > the link layer hardware knows when packets on the wire start and stop using
> > framing (manchester encoding or whatever).  it delivers this information to
> > the link layer software (device driver), which then provides it to IP.
>
> So, if the length
> supplied by the link layer is is too short, the packet
> should be discarded.  If it is longer, the excess data is
> simply ignored.

I thought the packets handed to IP layer by link layer are "clean" as the MAC
layer has CRC. The situation you mentioned can only be caused by an error of
higher layers. Am I wrong?

--Tianbo