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We have KWF6 as a company-firewall and VPN-server. Behind the firewall we have a RAS-server.

When I connect with the Kerio VPN Client to the firewall and up- or download a file to/from our fileserver we have a speed of 45KB/s.
But when I connect to the RAS-server with the Windows VPN Client I can reach a speed of 10 times higher (>400KB/s)!

What causes this big difference?

I have a rule made for each connection:

Rule namer : KERIO VPN
Source : Internet (the internet-adapter has multiple ip-adresses)
Destination: IP-address of
Service : Kerio VPN
Translation: no translation
Valid on : Always
Prot. insp.: Default

Rule name : WINDOWS RAS
Source : Internet (the internet-adapter has multiple ip-adresses)
Destination: IP-address of
Service : PPTP
Translation: MAP ip-address of the RAS-server
Valid on : Always
Prot. insp.: PPTP

I found this atricle in the knowledgebase: iewarticle&kbarticleid=395&nav=0,2

Due to the current driver design of WinRoute, the maximum sustained bandwidth through the firewall is approximately 50mbps (megabits per second). This is true of all network adaptors including gigabit. We are working on improvements to the drivers that will allow for better peak bandwidth useage.

If I understand this correct the following is true:
When I connect to KWF with the KWF VPN Client the maximum bandwidth is 50mbps.
When I connect to my RAS-server the maximum bandwidth is the maximum bandwidth of the internetconnection, because KWF is only passing through the data and not handling it.

Could anyone confirm this?

[Updated on: Mon, 27 August 2007 10:43]

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