Hello,
I have a problem with PF and I would appreciate any help. I spent few hours
googling around but found no solution.
We have a FreeBSD 6.1 router with 4 internal subnets on 4 interfaces (em1,
fxp0, fxp1, xl0), 1 connection to the Internet (em0) - 10Mbps both directions,
full duplex. What we need is to shape traffic so em1 + fxp1 , fxp0 and xl0 uses
equally 33% of traffic, in both incoming and outgoing directions from the
Internet (incoming direction is more important for us as we don't have almost
any servers inside our network except for HTTP for development purpose so
mostly we download data from the Internet). Traffic between local subnets
should stay unlimited.
That should not be problem - we could just set 3.33Mbps on each interface for
packets arriving from the Internet. What we cannot solve is how to set that
each interface could borrow bandwidth from other interfaces (= from parent
stream) if they are not fully utilised?
If I set ALTQ on the external interface, I can control only outgoing traffic to
the Internet (I made that work successfully). If I set ALTQ on any of the
internal interfaces I cannot set it to borrow from each other. Setting ALTQ on
multiple interfaces is not supported AFAIK. Is there any solution? Can that be
solved with packet tagging?
Another thing I do not completely understand is setting ALTQ rules on
interfaces. I just want to make it clear to myself. If I set ALTQ on an
interface, it means that packets are being dropped on the chosen interface? If
I set queue on an interface, it means that packets are added to that queue if
and only if the rule is evaluated on the chosen interface? For example if I
would have rules "queue Q on em0 ..." and "pass in on em1 ... queue Q", what
would that do?
My last question - I read TCP ACK packets prioritizing can increase incoming
throughput. Does that make sense on fast internet connections like is ours or
is it useful only for e.g. dial-up connections? I would use following ALTQ
settings:
ALTQ on $lan_ex bandwidth 10Mb cbq { queue_std, queue_ack }
queue queue_std on $lan_ex bandwidth 99%
cbq(default)
queue queue_ack on $lan_ex bandwidth 1%
... and create a TCP/ACK rule on $lan_ex with queue_ack
Thanks in advance for your help!
Ales Krajnik
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