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Table 10 Configuration > WAN > Management WAN: IPoE Encapsulation (continued)
LABEL
First DNS Server
Second DNS Server
Third DNS Server
Multicast Setup
Multicast Setup
Auto-Subnet Configuration
Enable Auto-IP-
Change Mode
Apply
Cancel
6.4.1.2 PPPoE Encapsulation
The EMG2881-T20A supports PPPoE (Point-to-Point Protocol over Ethernet). PPPoE is an IETF standard (RFC
2516) specifying how a personal computer (PC) interacts with a broadband modem (DSL, cable,
wireless, etc.) connection. The PPP over Ethernet option is for a dial-up connection using PPPoE.
For the service provider, PPPoE offers an access and authentication method that works with existing
access control systems (for example Radius).
One of the benefits of PPPoE is the ability to let you access one of multiple network services, a function
known as dynamic service selection. This enables the service provider to easily create and offer new IP
services for individuals.
Operationally, PPPoE saves significant effort for both you and the ISP or carrier, as it requires no specific
configuration of the broadband modem at the customer site.
By implementing PPPoE directly on the EMG2881-T20A (rather than individual computers), the
computers on the LAN do not need PPPoE software installed, since the EEMG2881-T20A does that part of
the task. Furthermore, with NAT, all of the LANs' computers will have access.
This screen displays when you select PPPoE encapsulation.
Chapter 6 WAN
DESCRIPTION
Select Obtained From ISP to have the EMG2881-T20A get the IPv6 DNS server addresses from
the ISP automatically.
Select User-Defined and enter the IPv6 DNS server address assigned by the ISP to have the
EMG2881-T20A use the IPv6 DNS server addresses you configure manually.
Select None if you do not want to configure DNS servers. If you do not configure a DNS server,
you must know the IPv6 address of a computer in order to access it.
Select IGMPv1/v2 to enable multicasting. This applies to traffic routed from the WAN to the
LAN.
Select None to disable this feature. This may cause incoming traffic to be dropped or sent to
all connected network devices.
Select this option to have the EMG2881-T20A change its LAN IP address to 10.0.0.1 or
192.168.1.1 accordingly when the EMG2881-T20A gets a dynamic WAN IP address in the
same subnet as the LAN IP address.
Select this option to have the EMG2881-T20A change its LAN IP address to 10.0.0.1 or
192.168.1.1 accordingly when the EMG2881-T20A gets a DNS server IP address in the same
subnet as the LAN IP address.
The NAT, DHCP server and firewall functions on the EMG2881-T20A are still available in this
mode.
Click Apply to save your changes back to the EMG2881-T20A.
Click Cancel to begin configuring this screen afresh.
EMG2881-T20A User's Guide
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