ZyXEL Communications P-2602HWLNI, Руководство пользователя, Страница: 107 / 496

Chapter 7 WAN Setup
P-2602HWLNI User’s Guide
107
Multiplexing Select the method of multiplexing used by your ISP from the drop-down list.
Choices are VC or LLC .
Virtual Circuit ID VPI (Virtual Path Identifier) and VCI (Virtual Channel Identifier) define a virtual
circuit. Refer to the appendix for more information.
VPI The valid range for the VPI is 0 to 255. Enter the VPI assigned to you.
VCI The valid range for the VCI is 32 to 65535 (0 to 31 is reserved for local
management of ATM traffic). Enter the VCI assigned to you.
IP Address
IP Address This option is available if you select Routing in the Mode field.
A static IP address is a fixed IP that your ISP gives you. A dynamic IP address is
not fixed; the ISP assigns you a different one each time you connect to the
Internet.
Select
Obtain an IP Address Automatically if you have a dynamic IP address;
otherwise select Static IP Address and type your ISP assigned IP address in
the IP Address field below.
Subnet Mask
(ENET ENCAP
encapsulation only)
Enter a subnet mask in dotted decimal notation.
Refer to the appendix
to calculate a subnet mask If you are implementing
subnetting.
Gateway IP address
(ENET ENCAP
encapsulation only)
You must specify a gateway IP address (supplied by your ISP) when you select
ENET ENCAP in the Encapsulation field
DNS Server
First DNS Server
Second DNS Server
Third DNS Server Select Obtained From ISP if your ISP dynamically assigns DNS server
information (and the ZyXEL Device's WAN IP address).
Select
User-Defined if you have the IP address of a DNS server. Enter the DNS
server's IP address in the field to the right. If you chose User-Defined , but leave
the IP address set to 0.0.0.0, User-Defined changes to None after you click
Apply . If you set a second choice to User-Defined , and enter the same IP
address, the second User-Defined changes to None after you click Apply .
Select DNS Relay to have the ZyXEL Device act as a DNS proxy only when the
ISP uses IPCP DNS server extensions. The ZyXEL Device's LAN IP address
displays in the field to the right (read-only). The ZyXEL Device tells the DHCP
clients on the LAN that the ZyXEL Device itself is the DNS server. When a
computer on the LAN sends a DNS query to the ZyXEL Device, the ZyXEL
Device forwards the query to the real DNS server learned through IPCP and
relays the response back to the computer. You can only select DNS Relay for
one of the three servers; if you select DNS Relay for a second or third DNS
server, that choice changes to None after you click Apply .
Select None if you do not want to configure DNS servers. You must have
another DNS server on your LAN, or else the computers must have their DNS
server addresses manually configured. If you do not configure a DNS server,
you must know the IP address of a computer in order to access it.
Connection
(PPPoA and PPPoE
encapsulation only)
Nailed-Up
Connection
Select Nailed-Up Connection when you want your connection up all the time.
The ZyXEL Device will try to bring up the connection automatically if it is
disconnected.
Connect on
Demand
Select Connect on Demand when you don't want the connection up all the time
and specify an idle time-out in the Max Idle Timeout field.
Table 23 Internet Access Setup (continued)
LABEL DESCRIPTION