I'm using M0n0wall 1.31 on PC Engines hardware.
Referring to the page '/firewall_shaper_edit.php', there are
several choices for 'IP Type of Service':
It seems that recent RFCs  have outdated the classical TOS
semantics used by the most recent M0n0wall release. I'm trying
to match DSCP class selector 5 (CS5) and am confused about the
mapping to the older TOS bits. A document  on such mapping
helps a little.
According to my own mapping effort, it seems that none of the
first three TOS choices above correspond to any bits of CS5.
The last two, mincost and congestion, are questionable.
Which of any of the above TOS values should I set to 'yes' on
the traffic shaper pages if I want to filter only CS5 packets?