[Ecn-sane] [Cake] The two SCE tests I have in mind

[Stephen Hemminger]

On Sun, 24 Mar 2019 13:32:03 +0100
Michael Richardson <mcr at sandelman.ca> wrote:

> Jonathan Morton <chromatix99 at gmail.com> wrote:
>     >> On 24 Mar, 2019, at 12:05 pm, Pete Heist <pete at heistp.net> wrote:
>     >> 
>     >> tcpdump -r file.pcap udp port 2112 and greater 80 and "ip[1] != 0x1”
>     >> 
>     >> “greater 80” ignores the handshake packets and 0x1 is whatever TOS
>     >> value we want to make sure the packets contain. We can use different
>     >> filters for other traffic.  
> 
>     > Bear in mind that the TOS byte contains ECN as well as DSCP fields, and
>     > the latter is left-justified.  
> 
> libpcap should probably learn about DSCN bits to avoid people having to
> think so much :-)
> 
> Send patches to me/github.
> 

Libpcap is ancient history by now. It is like ifconfig, everyone still can't reprogram
their brain; but the tool is on life support.

All development is happening on wireshark/tshark.