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[ScreenOS] VPN Overview



Article ID: KB4162 KB Last Updated: 03 Dec 2012Version: 4.0
This article provides an overview of VPN.
Overview of VPN.


A virtual private network (VPN) is a cost-effective and secure way for corporations to provide users dial up access to the corporate network and for remote networks to communicate with each other across the Internet. Secure private connections over the Internet are more cost-effective than dedicated private lines. NetScreen devices provide full VPN functions for secure LAN-to-LAN and Dial Up-to-LAN VPN applications.

LAN-to-LAN VPN example:

Image of LAN-to-LAN VPN example

Site A

  • Untrust IP of device
  • Trust Network

Site B

  • Untrust IP of device
  • Trust Network

For configuration examples, refer to the following articles:

Juniper Firewall LAN-to-LAN route based VPN articles

KB8533 - [ScreenOS] Juniper Firewall LAN-to-LAN Route Based VPN articles.

Juniper Firewall LAN-to-LAN policy based VPN articles:

KB8534 - [ScreenOS] Juniper Firewall LAN-to-LAN Policy Based VPN articles.

Configuring a VPN between a Juniper firewall and another Juniper or 3rd party device:

KB8554 - [ScreenOS] Configuring a VPN between a Juniper firewall and other Juniper or 3rd Party Device.

Dial Up-to-LAN VPN example:

Image of Dial Up-to-LAN VPN example

For Configuration examples, refer to the following articles:

Configuring a NetScreen-Remote Dial-Up VPN:

KB8535 - Configuring a NetScreen-Remote Dial-Up VPN.

Configuring a Shrew Soft Dial-Up VPN client:

KB22074 - How to configure Shrew Soft VPN client to work with ScreenOS firewalls.

Configuring a NCP VPN client

KB17364 - Example configuration of NCP Client.

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