ZyXEL Communications Vantage CNM 2.0 User Manual page 52

Vantage CNM 2.0
LABEL
DNS (Domain Name System) is for mapping a domain name to its corresponding IP
address and vice versa. The ZyXEL device passes a DNS (Domain Name System)
server IP address (in the order you specify here) to the DHCP clients. The ZyXEL
device only passes this information to the LAN DHCP clients when you select DHCP
Server. If you don't select DHCP Server, DHCP service is disabled and you must have
another DHCP sever on your LAN, or else the computers must have their DNS server
addresses manually configured.
Select From ISP if an ISP dynamically assigns DNS server information (and the ZyXEL
device's WAN IP address). The field to the right displays the (read-only) DNS server IP
address that the ISP assigns.
Select User-Defined if you have the IP address of a DNS server. Enter the DNS
First DNS Server
server's IP address in the field to the right. If you chose User-Defined, but leave the IP
Second DNS
address set to 0.0.0.0, User-Defined changes to None after you click Apply. If you set
Server
a second choice to User-Defined, and enter the same IP address, the second User-
Third DNS Server
Defined changes to None after you click Apply.
Select DNS Relay to have the ZyXEL device act as a DNS proxy. 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 ZyXEL device's system DNS server (configured in the
SYSTEM General screen) 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. If you do not configure a
DNS server, you must know the IP address of a machine in order to access it.
TCP/IP
IP Address Type the IP address of the ZyXEL device in dotted decimal notation. 192.168.1.1 is the
factory default.
IP Subnet Mask The subnet mask specifies the network number portion of an IP address. The ZyXEL
device automatically calculates the subnet mask based on the IP address that you
assign. Unless you are implementing subnetting, use the subnet mask computed by the
ZyXEL device, which is 255.255.255.0.
RIP Direction RIP (Routing Information Protocol, RFC1058 and RFC 1389) allows a router to
exchange routing information with other routers. The RIP Direction field controls the
sending and receiving of RIP packets. Select the RIP direction from Both/In Only/Out
Only/None. When set to Both or Out Only, the ZyXEL device broadcasts its routing
table periodically. When set to Both or In Only, it incorporates the RIP information that
it receives; when set to None, it does not send any RIP packets and ignores any RIP
packets received. Both is the default.
RIP Version The RIP Version field controls the format and the broadcasting method of the RIP
packets that the ZyXEL device sends (it recognizes both formats when receiving). RIP-
1 is universally supported but RIP-2 carries more information. RIP-1 is probably
adequate for most networks, unless you have an unusual network topology. Both RIP-
2B and RIP-2M sends the routing data in RIP-2 format; the difference being that RIP-
2B uses subnet broadcasting while RIP-2M uses multicasting. Multicasting can reduce
the load on non-router machines since they generally do not listen to the RIP multicast
address and so will not receive the RIP packets. However, if one router uses
multicasting, then all routers on your network must use multicasting, also. By default,
RIP direction is set to Both and the Version set to RIP-1.
5-4
Table 5-1 Configuration > LAN > IP – ZyWALL
DESCRIPTION
Configuration > LAN