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How to configure a VPN tunnel between a 3COM Firewall and a Linksys Router

This article describes how to configure a VPN tunnel between a 3COM SuperStack 3 Firewall and a Linksys BEFVP41 Router.

A. Configuring the SuperStack 3 Firewall:

·         Enable VPN on the SuperStack 3

·         Type the name on The Unique Firewall ID, which can be anything you wan to.

·         On the "VPN Configure" tab specify the following:

1. Security Association: Add new SA
2. IPSec Keying Mode: IKE using pre-shared secret
3. SA Name: ChicahoTech that can be name you wan to.
4. IPSec Gateway Address: x.x.x.x (your local gateway)
5. SA life time (secs): 28800
6. Encryption Method: Encrypt and Authenticate (ESP DES HMAC MD5)
7. Shared Secret: Specify a shared secret
8. Destination Networks: Specify the LAN subnet on the Linksys side. For example, 192.168.1.0.

B. Configuring the Linksys BEFVP41 Device:

• Enable VPN

1. Tunnel Name: ChicahoTech that can be name you wan to.
2. Local Secure group: Choose "subnet" and specify the Local LAN + subnet mask  Note: don’t use 0.0.0.0.
3. Remote Secure Group: Choose "subnet" and specify the Lan IP information on the SuperStack 3 side of the connection. Note: don’t use 0.0.0.0.
4. Remote Security Gateway: Choose "IP Address" and specify the NAT Public IP address of the SuperStack 3.  Note: don’t use 0.0.0.0.
5. Encryption: DES
6. Authentication: MD5
7. Key Management: Auto (IKE). Note: Don’t check the box for PFS
8. Pre-Shared Secret: Same shared secret specified on the 3Com
9. Key Lifetime: 28800

• Click on Advance Setting

1. Operation Mode: Main Mode
2. Proposal 1:

• Encryption: DES
• Authentication: MD5
• Group: 768-bit

10. Key Lifetime: 28800

Encryption: DES

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