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Barracuda NextGen Firewall X

This Product is End-of-Life and End-Of-Support

End-Of-Life and End-Of-Support on December 1st, 2020: All Barracuda Firewall X-Series sales will cease; neither new sales nor any renewals will be available. If you currently hold a maintenance and support contract, you will continue to receive our award-winning support and services until your contract expires. Please see the End-Of-Life definition as described in the End of Support and End of Life Information.

How to Configure a Client-to-Site VPN with PPTP

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As of 2012, PPTP is no longer considered secure. It is highly recommended that you switch away from PPTP because of the security risks involved.

Using VPNs, mobile workers can securely access corporate information and resources. The Barracuda NextGen Firewall X-Series allows all operating systems with PPTP clients to connect via a client-to-site VPN.

Follow the steps in this article to configure a client-to-site VPN using PPTP.

Step 1. Configure the X-Series Firewall VPN Server

The VPN server that runs on the X-Series Firewall must listen on the appropriate IP address for the clients. Depending on whether the X-Series Firewall is connected to the Internet through an ISP that statically or dynamically assigns the WAN IP address, complete the steps in the Static WAN IP Address or Dynamic WAN IP Address section. 

Static WAN IP Address

If the X-Series Firewall is connected to the Internet through an ISP that statically assigns the WAN IP address:

  1. Go to the NETWORK > IP Configuration page.
  2. In the Static Interface Configuration section, or on any Secondary IP Address of the management IP address, verify that the VPN Server check box for the interface is selected. 
Dynamic WAN IP Address

To allow VPN connections using a dynamically assigned WAN IP address on the X-Series Firewall, follow the steps in How to Allow VPN Access via a Dynamic WAN IP Address.

Step 2. Configure the PPTP Settings on the X-Series Firewall

Configure PPTP to let remote devices access the X-Series Firewall VPN.

  1. Go to the VPN > PPTP page.
  2. In the PPTP Settings section, enable and configure PPTP.
  3. On the same page, configure the user authentication method:
    • For local authentication, configure the settings in the Local PPTP Users section.
    • For MS-CHAPv2 and NTLM authentication, configure the settings in the User and Group Conditions (MS-CHAPv2/NTLM) section.

For more information on the PPTP and authentication settings, click Help on the VPN > PPTP page.

Step 3. Configure User Authentication

For user authentication, you can use local authentication or MS-CHAPv2/NTLM.

Local Authentication

To configure user access permissions with Local Authentication:

  1. Go to the VPN > PPTP page.
  2. In the Local PPTP User section, add the username and password for each user who is allowed to connect to the VPN. If required, specify a static IP address for the user.
  3. Click Save Changes.

With MS-CHAPv2/NTLM, you can allow access on a per-user or per-group basis. 

  1. Go to the VPN > PPTP page.
  2. In the User and Group Conditions (MS-CHAPv2/NTLM) section, add the users and groups who are allowed to connect to the client-to-site VPN.

    Note that successful authentication is only possible for users that are matching the conditions in Allowed Users AND Allowed Groups.

  3. Click Save Changes.

Step 4. Add the Firewall Rule to Allow Traffic Between VPN Clients and LAN

Create a new firewall rule to let PPTP traffic in the VPN tunnel pass between the VPN clients and the trusted LAN. The pre-installed VPNCLIENTS-2-LAN firewall rule does not match PPTP connections because they do not use the pvpn0 virtual interface. As a result, PPTP traffic is blocked by default.

Create a new firewall rule that lets VPN traffic from the PPTP clients access the Trusted LAN:

  1. Go to the FIREWALL > Firewall Rules page and add this rule:

    AllowThe network range assigned to the PPTP clients (configured in VPN > PPTP > Client IP Pool Begin/Client IP Pool Size)Trusted LANAny (or the allowed/required services)No SNAT (the original source IP address is used)
  2. At the top of the Add Access Rule window, click Add.

Step 5. Verify the Order of the Firewall Rules

New rules are created at the bottom of the firewall rule set. Because rules are processed from top to bottom in the rule set, arrange your rules in the correct order. You must especially ensure that your rules are placed above the BLOCKALL rule; otherwise, the rules are blocked.

After adjusting the order of rules in the rule set, click Save.


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