User's Manual

66xx/67xx Router Users Guide 58
attempting PPP authentication. The default (0) means that the gateway will pause a
random number of seconds before attempting authentication. This helps prevents the
PPP server from being flooded with authentication requests after a power shutdown or a
reset.
 Limit Retry Time of PPP Password on Authentication Error: Number of times the
gateway should re-attempt PPPoE authentication after a failure. When the Retry Timer is
disabled, the device will keep retrying using the PPP username and password.
 NAT Public Address (available if NAT is enabled). Enter 0.0.0.0 to specify that the
device should use pubic IP addresses provided by the network.
 Enable Fullcone NAT: RFC 3489 defines four types of Network Address Translation
(NAT). Fullcone NAT. As with other types of NAT there is a mapping from a public IP
address to a private IP address. The external public IP address is extended with the
external port. With Fullcone NAT once the mapping is created any external host may
send packets to the private IP address by sending to the external IP address and port.
Other types of NAT have restrictions such as the sending IP address must initially have
had packets sent from the private IP address and port regardless of the external port, or
from the private IP address and the external port.
 Dial on demand: When this mode is selected, the connection that has no traffic within
assigned disconnect timeout (e.g. 1 minute) will be automatically disconnected. The
connection will be activated again when traffic arrives. This function is advantageous for
users who are charged with online time. It should be noted that some programs
automatically link to Internet. Connections will not be disconnected under these data
streams.
• Inactivity Timeout: When Dial on demand is selected, this input box indicates that
after how long the connection will be disconnected in the absence of traffic. If the
value is 0, connection will not be disconnected.
 Manual Connect: connect/disconnect PPPoE connection manually
 PPP IP extension: Allows only one PC on the LAN. The public IP address assigned by
the remote using the PPP/IPCP protocol is actually not used on the WAN PPP interface.
Instead, it is forwarded to the PC’s LAN interface through DHCP.
Only one PC on the LAN can be connected to the remote since the DHCP server within
the VDSL gateway has only a single IP address to assign to a LAN device. NAT and
firewall are disabled when this option is selected. The VDSL gateway becomes the
default gateway and DNS server to the PC through DHCP using the LAN interface IP
address. The VDSL gateway extends the IP subnet at the remote service provider to the
LAN PC. That is, the PC becomes a host belonging to the same IP subnet. The VDSL
gateway bridges the IP packets between WAN and LAN ports, unless the packet is
addressed to the gateway’s LAN IP address.
 MAC Clone: Clicking the Clone the PC MAC Address button will use the MAC address
from the connected PC for the MAC address of the gateway.
 Use Static Ipv4 Address: Enter the Static IP V4 address
 Enable PPP Debug Mode: Used to debug PPPoE issues. Use only when instructed by
your ISP.
 Bridge PPPoE Frames Between WAN and Local Ports: By default the bridge PPPoE
frame between WAN and local ports is on. This allows a PC behind the modem to be the
PPPoE termination point. PPPoE authentication is passed on to the PC instead of to the
gateway. If there are multiple PCs then, each one will have a PPPoE authentication. Note
that this option is not applicable for PPPoA.
 Enable IGMP Multicast Proxy: Configures the gateway for IGMP snooping so the
gateway can keep limit multicast traffic.
 Enable MLD Multicast Proxy: Configures the gateway to act as a proxy by issuing MLD
host messages for the hosts that have been discovered through MLD interfaces.
Enable MLD Multicast Proxy is for IGMP in IPv6 mode.
10. Click Next.