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Cisco PIX Security Appliance And Microsoft Windows Vista TCP Window Scaling Troubleshooting
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Category : Softwares » Windows Vista
PIX Security Appliance and Microsoft Windows. Vista TCP Window Scaling Troubleshooting . Windows Vista Operating System (OS) enables the TCP Window Scaling .
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Content Summary :
The Microsoft Windows Vista OS enables the TCP Window Scaling option by default (previous WindowsOSes had this option disabled). The TCP Window Scaling option is described in RFC 1323 (TCP Extensionsfor High Performance), and allows for the device to advertise a receive window larger than 65 K than TCPoriginally specified. This is useful in the higher speed networks of today, where more data can be outstandingon the wire before it is acknowledged. This slow performance, or dropped TCP connections is caused by someversions of PIX software not supporting the TCP Window Scaling option. This causes it to have a muchsmaller TCP window than the endpoints actually have. This causes the Cisco PIX to drop packets that itbelieves are outside the TCP window, but which really are not. You experience this problem with older CiscoPIX software.
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