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Configure Static Packet Filters

Updated: February 13, 2009

Applies To: Windows 7, Windows Server 2008 R2

RRAS supports IP packet filtering, which specifies which type of traffic is allowed into and out of the RRAS server. The packet filtering feature is based on exceptions.

ImportantImportant
We recommend that you enable either static packet filtering or Windows Firewall, but not both. Conflicts between two sets of filter rules can result in desired traffic being unexpectedly blocked.

You can set packet filters per interface and configure them to do one of the following:

  • Pass through all traffic except packets prohibited by filters.

  • Discard all traffic except packets allowed by filters.

Membership in the local Administrators group, or equivalent, is the minimum required to complete this procedure.

  1. Open the Routing and Remote Access MMC snap-in.

  2. In the navigation pane, expand your RRAS server, expand either IPv4 or IPv6, and then click General.

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

  4. On the General tab, click either Inbound Filters or Outbound Filters.

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

  6. In the Add IP Filter dialog box, type the settings for the filter, and then click OK.

  7. In Filter action, select the appropriate filter action, and then click OK.

The following table lists some of the common ports and protocols that you might want to allow, depending on your remote access configuration. Not all ports listed here are required for your remote access server. For example, if you are allowing only Layer Two Tunneling Protocol (L2TP), you would not configure a filter for Point-to-Point Tunneling Protocol (PPTP). Similarly, this table might not contain all of the ports that your network needs.

 

Protocol Port Used For

TCP

25

Simple Mail Transfer Protocol (SMTP)

TCP

67

Dynamic Host Control Protocol (DHCP) (if the remote access server uses an external DHCP server)

TCP

80

World Wide Web (HTTP)

TCP

110

Post Office Protocol, version 3 (POP3)

TCP

443

SSTP (HTTP over SSL)

TCP

1701

L2TP

TCP

1723

PPTP

TCP

7250

Network Access Quarantine Control (Remote Access Quarantine Client (RQC) messages from client computers)

UDP

53

Domain Name Service (DNS) (for name resolution of external Web sites)

UDP

67

DHCP (if the remote access server uses an external DHCP server)

UDP

500

Internet Protocol security (IPsec)

UDP

1701

L2TP

UDP

1723

PPTP

UDP

4500

IPsec with network address translation (NAT)

47

Generic Routing Encapsulation (GRE)

50

Encapsulating Security Payload (ESP) (for firewalls that use NAT traversal [NAT-T])

noteNote
To support Windows Update, you must allow traffic to travel inbound and outbound on TCP port 80 and UDP port 53. Depending on your network configuration, you might have to configure these filters on your remote access server, on your firewall, or both.

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