Pppoe - D-Link NetDefendOS User Manual

TPID (Hexadecimal)
0x8100
0x88a8
0x9100
0x9200
0x9300
The Type property specifies the Tag Protocol Identifier (TPID) in the VLAN tag.
Since the VLAN object defaults to a Type of 0x8100 (a standard VLAN), the only Type usually
needed is 0x88a8 to specify a service VLAN. The last three entries in the list may be needed to
provide interoperability with external equipment from some manufacturers.
Service VLANs within Service VLANs
The BaseInterface property of a service VLAN object can be another service VLAN object. In other
words, one service VLAN can contain another service VLAN.
Although unusual beyond a couple of levels, NetDefendOS permits up to 16 levels of nesting,
with a VLAN object at the first level wrapped by a maximum of 15 levels of nested service VLAN
objects.

3.4.6. PPPoE

Point-to-Point Protocol over Ethernet (PPPoE) is a tunneling protocol used for connecting multiple
users on an Ethernet network to the Internet through a common local interface, such as a single
DSL line, wireless device or cable modem. All the users on the Ethernet share a common
connection, while access control can be done on a per-user basis.
Internet server providers (ISPs) often require customers to connect through PPPoE to their
broadband service. Using PPPoE the ISP can:
• Implement security and access-control using username/password authentication
• Trace IP addresses to a specific user
• Allocate IP address automatically for PC users (similar to DHCP). IP address provisioning can
be per user group
The PPP Protocol
Point-to-Point Protocol (PPP), is a protocol for communication between two computers using a
serial interface, such as the case of a personal computer connected through a switched
telephone line to an ISP.
In terms of the layered OSI model, PPP provides a layer 2 encapsulation mechanism to allow
packets of any protocol to travel through IP networks. PPP uses Link Control Protocol (LCP) for
link establishment, configuration and testing. Once the LCP is initialized, one or several Network
Control Protocols (NCPs) can be used to transport traffic for a particular protocol suite, so that
multiple protocols can interoperate on the same link, for example, both IP and IPX traffic can
share a PPP link.
PPP Authentication
Decimal Equivalent
33024
34984
37120
37376
37632
202
Chapter 3: Fundamentals
Description
IEEE 802.1Q VLAN (the default)
IEEE diffserv Service VLAN
0x9100 VLAN
0x9200 VLAN
0x9300 VLAN