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Chapter 22 UPnP
ZyWALL 2 Plus User’s Guide
379
22.3 Displaying UPnP Port Mapping
Click ADVANCED > UPnP > Ports to display the UPnP Ports screen. Use this screen to
view the NAT port mapping rules that UPnP creates on the ZyWALL.
Figure 250 ADVANCED > UPnP > Ports
The following table describes the labels in this screen.
Apply Click Apply to save your changes back to the ZyWALL.
Reset Click Reset to begin configuring this screen afresh.
Table 126 ADVANCED > UPnP
LABEL DESCRIPTION
Table 127 ADVANCED > UPnP > Ports
LABEL DESCRIPTION
Reserve UPnP
NAT rules in flash
after system
bootup
Select this check box to have the ZyWALL retain UPnP created NAT rules even
after restarting. If you use UPnP and you set a port on your computer to be fixed
for a specific service (for example FTP for file transfers), this option allows the
ZyWALL to keep a record when your computer uses UPnP to create a NAT
forwarding rule for that service.
The following read-only table displays information about the UPnP-created NAT mapping rule entries
in the ZyWALL’s NAT routing table.
# This is the index number of the UPnP-created NAT mapping rule entry.
Remote Host This field displays the source IP address (on the WAN) of inbound IP packets.
Since this is often a wildcard, the field may be blank. When the field is blank, the
ZyWALL forwards all traffic sent to the External Port on the WAN interface to the
Internal Client on the Internal Port. When this field displays an external IP
address, the NAT rule has the ZyWALL forward inbound packets to the Internal
Client from that IP address only.
External Port This field displays the port number that the ZyWALL “listens” on (on the WAN port)
for connection requests destined for the NAT rule’s Internal Port and Internal
Client. The ZyWALL forwards incoming packets (from the WAN) with this port
number to the Internal Client on the Internal Port (on the LAN). If the field
displays “0”, the ZyWALL ignores the Internal Port value and forwards requests
on all external port numbers (that are otherwise unmapped) to the Internal Client.
Protocol This field displays the protocol of the NAT mapping rule (TCP or UDP).
Internal Port This field displays the port number on the Internal Client to which the ZyWALL
should forward incoming connection requests.
Internal Client This field displays the DNS host name or IP address of a client on the LAN.
Multiple NAT clients can use a single port simultaneously if the internal client field
is set to 255.255.255.255 for UDP mappings.