hi,
I''ve successfully implemented shaping and policing with HTB for my
SDSL line.
Some tips&tricks I discovered which were not covered in the FAQs and
docs I read:
- To discover the appropriate rate for your line, flood it with
traffic and reduce the rate until the matching class starts to show
a consistent backlog -- only then you''ve managed to take the queue
away from your modems/routers and into the shaping box.
- The docs only speak about the IMQ device in connection with the
PREROUTING chain -- the problem is that at that point, incoming
packets are not de-masqueraded yet, so you can''t fwmark and shape
depending on the internal address; I use
<iptables packet marking>
iptables -i $EXT_IF -A FORWARD -t mangle -j IMQ
without problems.
Questions:
I''m not quite sure if I shoot myself in the foot with that IMQ setup
-- packets get stuffed into the IMQ device from the mangle table, but
where and how do they "reappear" after shaping?
The other question that remains is: with "tc qdisc show", I see
overlimit!=0 only for the root qdisc -- I would have expected it to
increase on the queues or classes where actual rate > configured
rate... why is that?
ciao,
cm.
--
Actually, I found New Zealanders to be the most akin to Canadians.
They also feel the looming presense of a next door neighbour country
full of loud, excessively happy and somewhat simple people, and are a
little intimidated by it. -- Paul Tomblin
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