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#1 (**permalink**) 02-16-2008, 07:02 AM

Hi All,
I'm trying to learn ALTQ, but I cannot figure out why it keeps cutting the
ftp upload to an external ftp server - even if I don't add
"queue something" to any of the "pass out on $ext_if..."
and just have:
e.g. a simple example:
altq on $ext_if cbq bandwidth 70Kb queue { net0, net1, net2, net3 }
queue net0 bandwidth 10% cbq(default)
queue net1 bandwidth 30% priority 2 cbq(borrow red)
queue net2 bandwidth 30% priority 2 cbq(borrow red)
queue net3 bandwidth 30% priority 2 cbq(borrow red)

if only these lines are present i.e. as I understand I don't really use
these queues unless I add e.g. "queue net2" at the end of "pass out.."
The download is ok but if I try to upload to an external ftp it cuts the
transfer almost immediately to an impossible value. What did I miss?

#2 (**permalink**) 02-16-2008, 07:02 AM

PiotrAF wrote:

> e.g. a simple example:
> altq on $ext_if cbq bandwidth 70Kb queue { net0, net1, net2, net3 }
> queue net0 bandwidth 10% cbq(default)
> queue net1 bandwidth 30% priority 2 cbq(borrow red)
> queue net2 bandwidth 30% priority 2 cbq(borrow red)
> queue net3 bandwidth 30% priority 2 cbq(borrow red)
>
> if only these lines are present i.e. as I understand I don't really use
> these queues unless I add e.g. "queue net2" at the end of "pass out.."
> The download is ok but if I try to upload to an external ftp it cuts the
> transfer almost immediately to an impossible value. What did I miss?

All outgoing traffic on $ext_if ends up in one of those four queues. If you
don't add a queue spec to the end of the rule that lets the ftp upload out,
it ends up in the default queue (net0 in this case). Because net0 is 10% of
the bandwidth, and can't borrow, this limits the upload to 10%.

If net0 could borrow, this would hide the effect by pulling more bandwidth
into net0; however, you've still got a problem. Set the default queue to
the one you'd like most traffic to go into, or put ftp upload into a
different queue.
--
Simon Farnsworth

#3 (**permalink**) 02-16-2008, 07:02 AM

On Tue, 22 Nov 2005 08:26:52 +0000, Simon Farnsworth wrote:

> PiotrAF wrote:
>
>> e.g. a simple example:
>> altq on $ext_if cbq bandwidth 70Kb queue { net0, net1, net2, net3 }
>> queue net0 bandwidth 10% cbq(default)
>> queue net1 bandwidth 30% priority 2 cbq(borrow red)
>> queue net2 bandwidth 30% priority 2 cbq(borrow red)
>> queue net3 bandwidth 30% priority 2 cbq(borrow red)
>>
>> if only these lines are present i.e. as I understand I don't really use
>> these queues unless I add e.g. "queue net2" at the end of "pass out.."
>> The download is ok but if I try to upload to an external ftp it cuts the
>> transfer almost immediately to an impossible value. What did I miss?
>
> All outgoing traffic on $ext_if ends up in one of those four queues. If you
> don't add a queue spec to the end of the rule that lets the ftp upload out,
> it ends up in the default queue (net0 in this case). Because net0 is 10% of
> the bandwidth, and can't borrow, this limits the upload to 10%.
>
> If net0 could borrow, this would hide the effect by pulling more bandwidth
> into net0; however, you've still got a problem. Set the default queue to
> the one you'd like most traffic to go into, or put ftp upload into a
> different queue.

Seems reasonable, although I still don't understand why the existance of
the above without any queue added to neither pass in nor pass out rules,
limits on;ly the ftp upload, and not everything which as I presume should
also be treated as default (net0)[ there is possibilty that I didn't check
it on downloading files though, and I cannot check it right now]
If so, the question is how to do it in case I have separate in/out limits
from the ISP i.e. in my case bandwidth 70Kb for in and bandwidth 70Kb for
out. double it and make 50%/50% queues for in and out?

#4 (**permalink**) 02-16-2008, 07:02 AM

PiotrAF wrote:
> Seems reasonable, although I still don't understand why the existance of
> the above without any queue added to neither pass in nor pass out rules,
> limits on;ly the ftp upload, and not everything which as I presume should
> also be treated as default (net0)[ there is possibilty that I didn't check
> it on downloading files though, and I cannot check it right now]
> If so, the question is how to do it in case I have separate in/out limits
> from the ISP i.e. in my case bandwidth 70Kb for in and bandwidth 70Kb for
> out. double it and make 50%/50% queues for in and out?

Each "altq on" statement only covers outgoing traffic on that interface, not
incoming. Downloads don't generate much upload traffic (230KByte/s
generates around 1KByte/s of upload here), so probably aren't getting hit.

You need to do your queueing on multiple interfaces on a firewall, one for
traffic going to the ISP, and one for traffic going to your local network.
--
Simon Farnsworth

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ALTQ - what I am not aware of that causes side effect of cutting the ftp upload?