RE: [LARTC] Bandwidth Restrictions in Linux

["ISC Robert Kryczalo" <robert.kryczalo@iscnet.pl>]

Hello,
> I thank your comments... We are WISP from just two years... we
> use AP Lucent
> Orinoco.. In the begining we use Karlnet software but now we are in mode
> 802.11b. That change make us see the way to limit the bandwidth... We are
> using channel 1 with an omni for an PMtP and channel 6 and 11
> with two PtP.
It seems ok.

> In moments that the delay of the pings are high, the pings to
> other clients
> are normal... besides the pings between wireless client are
> ALWAYS good and
> normal.. the only delay is SOMETIMES from the linux to the some clients...
Are you 100% sure about it? If so I would bet CBQ is to blame.
>
> The Signal and Noise are very good (between 15 and 25 of SNR in all
> clients).. it is not so, I would have problem with all clients and I could
> tell you that I have never not delay with client limit to 128Kbps, and I
> have sometimes delay with the one who has less bandwidth.
I always try to be at around -30dB. Anyway 20 is usually good.
>
> I think that is not a mistake in the configuration of CBQ becouse we are
> using the INI Files where I put only some values and all the rules are
> charge in Memory when I execute CBQ.INIT START.
>
> The AP Lucent Orinoco is configure in 2Mg, I will configure at 1Mg to
> minimalize the hidden node effect.
Well in my lab in perfect conditions I have got problems with 802.11b
devices working at 1Mbps.
It resulted in packet loss. Ant it will increase delays for sure.
>
> I think is a problem of CBQ at that lower bandwith.. someone told
> me to use
> HTB or TBF.. Can they be better than CBQ..?
Yes they can. I have just switched to HTB from CBQ and I am more than
pleased with that. Anyway HTB has several drawbacks and its use is sometime
not so intuitive. I am still not able to predict its behaviour precisely in
many situations.. fortunately I have my setup in one finger;)
Look for the messages with "How HTB treats priorities" in subject line.
Anyway clever setup can for sure decrese ping times, increase interactivity
and limit p2p software. I am currently able to limit my bandwidth usage by
50% and customers are more pleased than ever. And HTB works well with rates
of 15kbits/s and with some tweaking 12kbits/s. Lower rates are possible but
can produce side effects. And you have burst and cburst... HTB also shapes
better and dont get stuck. Sometimes earlier versions of htb work better.

>
> We have besides a CISCO 3620 just configures to try and test
> limit bandwith
> over PPPoE.. Somebody tell that it is not the best solution... we will
> try...
Well, I am going to introduce PPPoE with MAC address pairs on karlnet
devices but I have to test it first... It seems to be a reasonable solution,
especially when billing and history and more security is required.

Robert Kryczalo

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