On 6 Oct 2016, at 15:01, Mark Martinec wrote:
Just adding recognition to a parser for a couple of DSCP constants
to be mapped to TOS is not the solution. Keep in mind that DSCP
is a 6-bit field, and TOS is an 8-bit field. The remaining two bits
are used for ECN (Explicit Congestion Notification).
Setting TOS field with the intention of changing DSCP
clobbers ECN bits. Pf needs a proper support for DSCP,
currently it is unusable for this purpose in FreeBSD
(one can use the PF from OpenBSD).
Hmm, that’s a good point.
OpenBSD seem to just always preserve the ECN bits (so there’s no dscp
keyword).
Perhaps we should do the same.
Regards,
Kristof
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