On a related note, I work with some equipment that uses TOS values and
some that uses DSCP.

When you see a TOS value in tcpdump (0x68 for instance) just divide by 4
to get the DSCP (and throw away any remainder.)  The DSCP value uses the same
field in the IP packet as TOS, but ignores the last bits.  So, DSCP to TOS
is simply multiply by 4 (and convert to hex)

David Newman [dnewman@networktest.com] wrote:
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> I'm setting up ALTQ and hfsc to prioritize VoIP traffic. The pf.conf(5)
>  says pf uses TOS values to assign packets to queues.
> 
> Question: Can OpenBSD and/or pf itself set TOS and/or DSCP values?
> 
> Only some of my VoIP gear does DSCP marking.
> 
> Also, I noticed today that Google marks all their stuff with a DSCP of
> 0x38 (high throughput, low delay). Nice trick, but also an excellent
> argument for re-marking capability in all routers.
> 
> Is marking/re-marking supported, and if so how?
> 
> thanks
> 
> dn
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> fPyu9fhGY+5DcWgTJiy60tQ=
> =j+kp
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