Netopia 3300-ENT manual Pptp example, Filter Sets Display/Change Basic Firewall

4-26 Firmware User Guide

PPTP example

To enable a firewall to allow PPTP traffic, you must provision the firewall to allow inbound and outbound TCP packets specifically destined for port 1723. The source port may be dynamic, so often it is not useful to apply a compare function upon this portion of the control/negotiation packets. You must also set the firewall to allow inbound and outbound GRE packets, enabling transport of the tunnel payload.

From the Main Menu navigate to Display/Change IP Filter Set, and from the pop-up menu select Basic Firewall.

Main	System
Menu	Configuration

Select Display/Change Input Filter.

Display/Change Input Filter screen

Filter Sets

Display/Change

Filter Set

Basic

Firewall

+--#----	Source IP Addr----	Dest IP Addr------	Proto-Src.Port-D.Port--			On?-Fwd--	+
+---------------------------------------------------------------------------							+
1	0.0.0.0	0.0.0.0	TCP	NC	=2000	Yes No
2	0.0.0.0	0.0.0.0	TCP	NC	=6000	Yes No
+---------------------------------------------------------------------------							+

Select Input Filter 1 and press Return. In the Change Input Filter 1 screen, set the Destination Port information as shown below.

Change Input Filter 1

Enabled:Yes

Forward:Yes

Source IP Address:	0.0.0.0
Source IP Address Mask:	0.0.0.0
Dest. IP Address:	0.0.0.0
Dest. IP Address Mask:	0.0.0.0
Protocol Type:	TCP
Source Port Compare...	No Compare
Source Port ID:	0
Dest. Port Compare...	Equal
Dest. Port ID:	1723
Established TCP Conns. Only:	No

Select Input Filter 2 and press Return. In the Change Input Filter 2 screen, set the Protocol Type to allow GRE as shown below.