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hi, my Q. is about maximum internet line speed.

Is it truth, that max. speed shoud be 4 Mbit, on faster lines you can not receive more than 4 Mbit IN traffic?

I am asking because we plan to upgrade line and its Q. if KWF will be able to handle e.g. 10 Mbit line.

dependency on HW please do not discuss, my HW is not problem (very fast)

thanks for any experiences or A.


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i have 100 mbps fiber-optic connection and the max speed was 6-6.5 mbytes/second (appx 50mbps), ussualy for p2p connections.
but limitation is because i have slow processor (sempron 2400+, 1024Mb RAM). at this speed i have 100% cpu utilisation.

in one week i get an intel 630 processor, so i expect more bandwith output...

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You will find this true in many cases.

First, you will never get 100mbps on an advertised 100mbps line; you will lose some because of TCP/IP packet overhead. You could expect 75-80mpbs at best, in my experience.

Second, bandwidth is limited because the firewall must examine every single packet that you are sending. If you have many traffic policies, or ISS/Cobion filter, or antivirus, there is even more inspection being done.

Addtitional CPU will definately help you, but do not expect to get 100mbps from your line =)

Joshua Thomas
Technical Support Manager
2350 Mission College Blvd, Suite 400
Santa Clara, CA 95054
Phone: (408) 496-4500
Fax: (408) 496-6902


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On one of our servers which is dedicated to the firewall we typically see

15-20% CPU usage for approx 3mbits of continious traffic (2out 1in), as the server is connected to the internet on a Gbits per second port, then you can see that as we scale up to more connections, were going to be having problems.

Typical load is 2mbits outgoing, 1mbits incomming, and approx 1000 connections in the firewall (although some of these will be idling).

Server is a win2003 standard server
2GB ram
a64 3000+


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i think its not like what u said, for instance at first i had a speed of 2Mbps and then now i upgraded the speed , when i check the speed now it comes to around 10Mbps but i didnt change the physical connection

[Updated on: Fri, 20 November 2009 07:42]


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We have a 50mbit fiber connection (up & down) and KWF has no problem is actually using that bandwidth. That's with all processing and AV scanning turned on.
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