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Set PPTP input filters

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Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2

To set PPTP input filters

To set PPTP input filters, you must configure up to three input filters and select the appropriate filter action.

To add the first input filter

  1. Open Routing and Remote Access.

  2. In the console tree, click General.

    Where?

    • Routing and Remote Access/server name/IP Routing/General

  3. In the details pane, right-click the interface on which you want to add a filter, and then click Properties.

  4. On the General tab, click Inbound Filters.

  5. In the Inbound Filters dialog box, click New.

  6. In the Add IP Filter dialog box, select the Destination network check box.

  7. In IP Address, type the IP address of the interface, and in Subnet mask, type 255.255.255.255.

  8. In Protocol, click Other.

  9. In Protocol number, type 47, and then click OK.

To add the second input filter

  1. In the Inbound Filters dialog box, click New.

  2. In the Add IP Filter dialog box, select the Destination network check box.

  3. In IP Address, type the IP address of the interface, and in Subnet mask, type 255.255.255.255.

  4. In Protocol, click TCP.

  5. In Source port, type 0.

  6. In Destination port, type 1723, and then click OK.

To add the third input filter (optional)

If the PPTP server computer is also used as a PPTP client, you need to configure an additional filter.

  1. In the Inbound Filters dialog box, click New.

  2. In the Add IP Filter dialog box, select the Destination network check box.

  3. In IP Address, type the IP address of the interface, and in Subnet mask, type 255.255.255.255.

  4. In Protocol, click TCP [established].

  5. In Source port, type 1723.

  6. In Destination port, type 0, and then click OK.

To select the filter action for the input filters

  • In the Inbound Filters dialog box, click Drop all packets except those that meet the criteria below, and then click OK.

Note

  • To perform this procedure, you must be a member of the Administrators group. As a security best practice, consider using the Run As command rather than logging on with administrative credentials. If you have logged on with administrative credentials, you can also open Routing and Remote Access by clicking Start, clicking Control Panel, double-clicking Administrative Tools, and then double-clicking Routing and Remote Access. For more information, see Default local groups, Default groups, and Using Run as.

Information about functional differences

  • Your server might function differently based on the version and edition of the operating system that is installed, your account permissions, and your menu settings. For more information, see Viewing Help on the Web.

See Also

Concepts

Working with MMC console files
Packet filtering
Add a packet filter
Select the PPTP interface
Set PPTP output filters