Queueing with pf
norgaard at locolomo.org
Wed Jun 14 08:21:41 UTC 2006
I have a network:
54Mbps 100Mbps 320Kbps->
WLAN ------ FBSD w PF ------- DSL --------- Internet
Clearly, any congestion will occur on the DSL-Internet line.
I want to enable queueing on the FBSD gateway using PF such that the
DSL-Internet connection does not get saturated with questionable traffic
such as p2p and to allow free riders limited access without getting
sucking up all the bandwidth, something like this:
WLAN -> Internet 320Kbps
critical 256Kbps pri 1 borrow
noncrit 48Kbps pri 2 borrow
freeriders 16Kbps pri 3
Internet -> WLAN 2Mbps
critical 1.5Mbps pri 1 borrow
noncrit 256Kbps pri 2 borrow
freeriders 128Kbps pri 3
That is, freeriders should be able to do the most basic task, but since
they don't share the costs they should always be lowest priority. Also,
I want to make sure that bandwidth intensive protocols such as voip gets
Now, reading the PF manual, queueing only makes sense on traffic going
out. Once packets are received there's no point in holding them back.
This means that packets from the Internet to some wlan host have
consumed their part of the 2Mbps available so there is no point in
holding them back.
In other words, it seems I need to queue the packets from the wlan to
the Internet such as to get the desired result on both upstream and
downstream. Any ideas on how to do that?
I think I need a better picture of how much goes in each direction for
the different protocols, ie. p2p down ~= up, while http down ~= 4*up? Do
any one have some thumb rules for this?
Secondly: Is it possible to differentiate scp/sftp and ssh such that the
later goes in the critical queue while the former goes in the noncritical?
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