Date: Mon, 23 May 2005 23:19:47 +0200 From: "Alexandre D." <alexandre.delay@free.fr> To: <freebsd-ipfw@freebsd.org> Subject: RE: QoS and guaranteed bandwidth Message-ID: <MAEBLPAGHGPMOKCBICBNEEHACFAA.alexandre.delay@free.fr> In-Reply-To: <008801c55fd5$d6e7dec0$0100000a@R3B>
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I have another procedure to submit to you all:
1) sysctl net.inet.ip.fw.one_pass=0
this allow to set several pipes for each data
2) add a pipe for each user in order limit the user bandwidth:
ipfw pipe $pipe config bw ${kbps}Kbit/s
ipfw add $fwrule pipe $pipein ip from any to $clientip in
3) add a global pipe for the global bandwidth and then add a weighted queue
for each users:
for this, we use weight (ie: 1 for 128, 2 for 256...)
ipfw pipe 1 config bw ${global_bw}Kbit/s
ipfw queue $queue config pipe 1 weight 1 # for 128 user
ipfw queue $queue config pipe 2 weight 2 # for 128k user
# then redirect the traffic
ipfw add $fwrule queue $queue ip from any to $clientip in
of course we do the same for outgoing traffic
For the guaranteed bandwidth, one more time, it is given by a "weight
calculation".
What do you think of it?
Alex
-----Message d'origine-----
De : owner-freebsd-ipfw@freebsd.org
[mailto:owner-freebsd-ipfw@freebsd.org]De la part de Chris
Dionissopoulos
Envoyι : lundi 23 mai 2005 22:27
ΐ : ovidiue@unixware.ro; freebsd-ipfw@freebsd.org
Objet : Re: QoS and guaranteed bandwidth
>I must have two different values for every user: guaranteed bandwidth and
> maximum bandwidth
>
> Citat "Alexandre D." <alexandre.delay@free.fr>:
This adds a little complexity to the previous procedure.
Variables:
~~~~~~~~
$N = group number of users [1,2,.....]
$USER_MAX_BW[$N] max bandwidth of a single user in group $N.
$USER_MIN_BW[$N] min bandwidth of a single user in group $N.
$USERS_SUBNET[$N], a group subnet (of users) in CIDR format.
$WAN_INTERFACE, your gateway wan interface name.
Procedure:
========
1. Calculate your priority
~~~~~~~~~~~~~~~~~~~
The rule says that the priority in WFQ is calculated if you divide your
total bandiwdth
with the minimum allocated bandwidth to each user. So we have:
$WFQ_Priority[$N] = $USER_MAX_BW[$N] / $USER_MIN_BW[$N].
2.Add a proper Pipe and Queue
~~~~~~~~~~~~~~~~~~~~~~~~~
ipfw pipe $N config bw $USER_MAX_BW[$N] queue 20Kbytes
ipfw queue $N pipe $N weight $WFQ_Priority[$N] mask src-ip 0xffffffff queue
10kbytes
ipfw add queue $N ip from $USERS_SUBNET[$N] to any xmit out $WAN_INTERFACE
example:
=======
2 groups of users:
Group1 - 192.168.0.0/28 , Bandwidth = min 32Kbps - max 256kbps
Group2 - 192.168.0.16/28 , Bandwidth = min 32Kbps - max 384Kbps
$wan = fxp0
(I assume that your line has at least the minimum bandwidth you guarantee.
in our case is 32users x 32kbps = 1024Kbps )
1.priorities:
$wfq[1] = 256 / 32 = 12
$wfq[2] = 384/ 32 = 16
2.ipfw commands:
ipfw pipe 1 config bw 256Kb/s queue 20Kbytes
ipfw queue 1 pipe 1 weight 12 mask src-ip 0xffffffff queue 10kbytes
ipfw add queue 1 ip from 192.168.0.0/28 to any xmit out fxp0
ipfw pipe 2 config bw 384Kb/s queue 20Kbytes
ipfw queue 2 pipe 2 weight 16 mask src-ip 0xffffffff queue 10kbytes
ipfw add queue 2 ip from 192.168.0.16/28 to any xmit out fxp0
So simple!
Chris.
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