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10-34 Firmware User Guide
FTP sessions. To allow WAN-originated FTP sessions to a LAN-based FTP server with the IP address a.b.c.d
(corresponding to a numbered IP address such as 163.176.8.243), insert the following input filter ahead of the
current 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: a.b.c.d
■ Dest. IP Address Mask: 255.255.255.255
■ Protocol Type: TCP
■ Source Port Comparison: No Compare
■ Source Port ID: 0
■ Dest. Port Comparison: Equal
■ Dest. Port ID: 21
Note: A similar filter could be used to permit Telnet or WWW access. Set the Dest. Port ID to 23 for Telnet or
to 80 for WWW.
Note: Deleting a filter set does not delete the filters in that set. However, the filters in the deleted set are no
longer in effect (unless they are part of another set). The deleted set will no longer appear in the answer profile
or any connection profiles to which it was added.
Policy-based Routing using Filtersets
Previous firmware versions routed IP packets only by destination IP address. Netopia Firmware Version 5.4
offers the ability to route IP packets using criteria other than the destination IP address. This is called
policy-based routing. You are now able to route IP traffic based on the following:
■ source IP address
■ source and/or destination protocol field
■ source and/or destination port numbers
■ TOS field
You specify the routing criteria and routing information by using IP filtersets to determine the forwarding action
of a particular filter.
In previous firmware versions, a filter would either pass or block the specified traffic. Netopia Firmware Version
5.4 adds a third option, force routing. You specify a gateway IP address, and each packet matching the filter is
routed according to that gateway address, rather than by means of the global routing table.
In addition, the TOS field has been added to the classifier list in a filter. This allows you to filter on TOS field
settings in the IP packet, if you desire.