Andy Gospodarek wrote:
On 10/29/07, Benny Amorsen <benny+usenet@xxxxxxxxxx> wrote:
"LS" == Leigh Sharpe <lsharpe@xxxxxxxxxxxxxxxxxxxxxx> writes:
LS> Standard e1000 hardware. The packets being bridged contain a VLAN
LS> tag, which is included in the 60 bytes.
The e1000 has VLAN acceleration. The VLAN tag is sent in a separate
register. If you do packet capture on the sender, the packet will
likely look 60 bytes long, even if it is 64 bytes on the wire.
The same thing happens on receive. Packet dumping with VLAN's is a bit
of a mess in Linux. If you're lucky you can find a card without VLAN
acceleration to do the packet dump.
/Benny
Are these the lengths on the wire or when captured on the host? The
smallest VLAN tagged frame should be 68 bytes IIRC. A tagged frame
that is 64 bytes seems too small.
That is not correct per the 802.1Q VLAN RFC, though
I don't have the reference handy at the moment.
64 bytes is fine, vlan tagged or otherwise.
Thanks,
Ben
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--
Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc http://www.candelatech.com
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