Chapter 5 WAN Setup
P-870HN-51D User’s Guide
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5.5.1.4 NAT, IGMP Multicast and Firewall Activation
The screen is available only when you select IP over Ethernet in the WAN
Service Configuration screen.
Figure 35 WAN Configuration: NAT, IGMP Multicast and Firewall Activation
The following table describes the labels in this screen.
Table 19 WAN Configuration: NAT, IGMP Multicast and Firewall Activation
LABEL DESCRIPTION
Enable NAT Select this option to enable NAT on the P-870HN-51D. You can also
select the NAT Type you want the P-870HN-51D to implement. The
choices are as follows:
• Symmetric NAT (default) - Symmetric NAT maps requests from
the same private IP address and port to a different public source IP
address and/or port depending on the packet's destination IP
address.
• Port Restricted Cone NAT - Restricted cone NAT maps all
requests from the same private IP address and port to the same
public source IP address and port.
• Restricted Cone NAT - Restricted cone NAT maps all requests
from the same private IP address to the same public source IP
address.
• Full Cone NAT - In full cone NAT, all requests from the same
private IP address and port are mapped to the same public source
IP address and port. Someone on the Internet only needs to know
the mapping scheme in order to send packets to a device behind
the NAT router.
Enable Firewall Select this check box to activate Firewall on this connection.
Enable IGMP
Multicast Proxy
Select this check box to have the P-870HN-51D act as an IGMP proxy
on this connection. This allows the P-870HN-51D to get subscribing
information and maintain a joined member list for each multicast
group. It can reduce multicast traffic significantly.
Back Click this button to return to the previous screen.
Next Click this button to continue.
