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On 8/22/07 5:22 AM, Henning Brauer wrote:
quoted text
> * David Newman <dnewman@networktest.com> [2007-08-21 21:41]:
>> Question: Can OpenBSD and/or pf itself set TOS and/or DSCP values?
> 
> not for forwarded traffic, no.
> for locally originating traffic, there are socket options.

OK, thanks. This answers my question.

quoted text
> 
>> 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.
> 
> nice trick? rather useless. I'd be extremely surprised if it makes any 
> difference at all.
> i mean, who is really
> 1) looking at DSCP/TOS at all, 
> - and -
> 2) using them for different forward9ng priorities
> - and -
> 3) has congestion/fwd capa shortage  so that it actually makes a 
>    difference,
> - and -

For various reasons I can't name names, but I can tell you that there
are some VERY large service provider and enterprise networks using DSCP
classification and prioritization.

ISPs tend to run at much higher utilization levels than enterprises and
congestion is a reality on at least some of their pipes. So is the
layer-8 urge to charge a premium to one set of customers over another.
And even in the absence of congestion, there's still a desire to service
delay- and jitter-sensitive voice and video ahead of other traffic.

quoted text
> 4) trusts externally set TOS/DSCP

No one should trust external TOS or DSCP markings. Again, what Google is
doing is an excellent argument for re-marking capability in all routers.

And here we come full circle. Given the OpenBSD now IS a router --
whether it's a little two-interface pf box for home use or some big
studly hardware running OpenBGPD and OpenOSPFD box for ISPs, I would say
the addition of support for DSCP re-marking would be a very desirable
feature.

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