InterScan Web Security Virtual Appliance (IWSVA) 6.5 performance problem

We had some trouble with IWSVA to use the full download speed from our internet connection. Downloads are limit to 5 MB per second and not faster. After contactig support and a remote session. The support send me this solution.

After this, we can use our full internet speed with IWSVA

 

[Findings]

From @sysctl.conf in CDT:
——————-
net.ipv4.tcp_window_scaling=0
——————–

By default, in IWSVA, window scaling is disabled.

[Suggestion]

– Set the TCP Windows Scaling from 0 to 1.

  1. Login IWSVA shell

 

  1. Open /etc/sysctl.conf

 

  1. Find and change the following parameter to the coresponding value.

————————-

net.ipv4.tcp_window_scaling=1

————————-

  1. Run command “sysctl -p”

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