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On Fri, Dec 27, 2002 at 10:23:04PM -0500, David W. Rankin Jr. wrote:
> For ethernet packets, where does the CRC generation occur? How about the
> CRC checks?

Both in the hardware, for all Ethernet hardware known to me. Most that I've
looked at even throw away received packets with wrong crc before the CPU se=
es
them (at least optionally), only incrementing an error counter.

> In my work to make VLT work,

what's that?

> I've discovered that the code
> generates the wrong CRCs, and appearantly drops incoming packets=20
> because the CRCs are wrong. (VLT packets basically stick 4 octets ahead
> of the packet that aren't supposed to be counted in the CRC.)

Are you sure? This sounds like an Ethernet framing error to me - before the
address frames there are only the preamble bits used to synchronize the=20
receiver clock.
>=20
> Unfortunately, I've looked and looked at the ethernet code, but the CRC
> code doesn't jump out at me, so I figured I'd ask for help.

see above.

Regards,
	-is

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