out xmit (demux) pipe bw accounting

[Chuck Swiger]

Hi--

On Aug 17, 2009, at 7:32 AM, Michael Spratt wrote:
> Could not find answer to following question.
>
> Given :
> # pipe 1 config bw 1Mbit/sec
> # ipfw 1000 add pipe 1 ip from any to any out xmit em0
>
> Will the bandwidth limit include layer 2 Ethernet headers or will  
> only the IP datagram itself be included in the accounting mechanism?

IPFW normally processes traffic at layer-3, but you can toggle  
net.link.ether.ipfw sysctl to on, in which case the above rule would  
also be run against layer-2 packets including the 802.3 ethernet  
header.  See the diagram in "PACKET FLOW" of "man ipfw"....

Regards,
-- 
-Chuck