"PUFQ depends on LinuxIMQ. "Linux IMQ is a virtual network
device that can be used to queue packets" says Utter. "First, the
PUFQ methodology classifies high-priority traffic using IP tables,
and marks each packet so later stages will know how to properly
prioritize each packet. Then the traffic is redirected to the PUFQ
and non-PUFQ paths based on the rule set for IP blocks or other
""The PUFQ path splits the traffic into separate rate-limited
queues for each user," says Utter. "Then the packets are forwarded
through a high priority or low priority queues based on the
priority mark. The packets return to the normal routing path until
they are ready to be forwarded. Then on the exit path, PUFQ traffic
is separated into high and low priority queues again. It is at this
point where the high and low priority traffic can be rate limited
on an aggregate basis if needed."
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