C
HAPTER
6
| WAN Settings
Channel Configuration
– 54 –
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VC/MUX
(Virtual Circuit Multiplexing) – When using this mode, the
communicating hosts agree on the high-level protocol for a given
circuit, which tends to reduce fragmentation overhead. This allows a
sender to pass each datagram directly to AAL5 for transfer, and
requires nothing to be sent besides the datagram and the AAL5
trailer. The chief disadvantage of this scheme is that a host must
create a separate virtual circuit for each high-level protocol if more
than one protocol is used. Because most carriers charge for each
virtual circuit, customers try to avoid using multiple circuits because
it adds unnecessary cost.
◆
Channel Mode
— The protocol used on the channel, as specified by
the service provider. Choose from the following options:
■
1483 Bridged
— The Bridged RFC 1483 Encapsulated Traffic over
ATM feature allows you to send bridged RFC 1483 encapsulated
packets over ATM switched virtual circuits (SVCs).
■
1483 MER
— 1483 MER is an RFC standard MAC Encapsulated
Routing protocol.
■
PPPoE
— Point-to-Point Protocol over Ethernet (PPPoE).
■
PPPoA
— Point-to-Point Protocol over Asynchronous Transfer Mode
(PPPoA).
■
1483 Routed
— Allows you to send routed RFC 1483 encapsulated
packets over ATM switched virtual circuits (SVCs).
■
IPoA
— Dynamic IP over ATM (IPoA).
◆
Enabled NAPT
— Enables Network Address Port Translation for the
channel.
◆
Enable IGMP
— Enables IGMP for the channel.
◆
PPP Settings
— Configures settings for PPPoE and PPPoA modes.
■
User Name
— The PPP access user name provided by the ISP.
■
Password
— The PPP access password provided by the ISP.
■
Type
— Selects the connection type; Continuous, Connect on
Demand, or Manual.
■
Idle Time
— The number of minutes you want to have elapsed
before your Internet access disconnects in Connect-on-Demand
mode.
◆
WAN IP Settings
— Configures settings for 1483 MER, 1483 Routed,
and IPoA modes.
■
Type
— Selects fixed IP or DHCP. When fixed IP is selected, enter
the local IP address, gateway, and subnet mask. When DHCP is
