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We are using the Kerio Control appliance (Kerio Control Box 3110).
Recently we have upgraded our internet connect to 100 Mbit down and 20 Mbit up. However, behind the firewall we only receive 60/12.

I am wondering what is limiting the speed? I am reluctant to play with a device in production and would appreciate some ideas.
We are running Antivirus, Kerio Content Filter, DHCP server. Only a few traffic rules are configured, nothing overly complicated.

Or is it the fact that we are using the first generation Kerio appliance and the hardware cannot keep up?


[Updated on: Tue, 25 November 2014 00:20]


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I have figured out the bandwidth problem. However, I find it puzzling.

According to this article: h-optimization/bandwidth-management-setting-speed-of-the-lin k-1373.html the bandwidth should be set 20% lower than what the ISP advertises. That is what I did, I set it to 80/15. So far so good (or bad). Just out of curiosity I disabled all the bandwidth rules and removed the internet bandwidth settings from the 'bandwidth management and qos' menu. All of a sudden I got the full advertised speed, even a little more. Since I want to use bandwidth management I have to set the values. Therefore I decided to set those to 100/20 but now I only got something like 80/15. I kept increasing the values incrementally. The values are now set to 140/30 and I get a little more than what the ISP is promising.

At least in our case it seems as if 'Bandwidth Management and QoS' decreases the advertised internet bandwidth by about 20%. Which is not quite what the article I mentioned says.

Feature, bug or configuration error?

I also would like to add that the CPU utilization is usually low (around 10%).

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Playing around I noticed this also, will look into it more when I have some time.

- Brian
Kerio Preferred Partner, Reseller & Hosting Provider
Unified Technology Solutions

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Why isn't this an automated process in Kerio, i.e. why isn't there a routine which determines the bandwidth and sets the values accordingly maybe once a day or once a week?

Also, I do not understand why even if I use fixed (absolute) values (e.g. 5Mbit/2Mbits) instate of relative (percentage) values the bandwidth values need to be set?
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