NPort 5200 Series User’s Manual
Web Console Configuration
5-7
Netmask
Setting
Factory Default
Necessity
E.g., 255.255.255.0
255.255.255.0
Required
A netmask identifies a local area network. When a packet is sent out over the network, the NPort
5200 will use the subnet mask to check whether the destination TCP/IP host specified in the packet
is on the local network segment. If the address is on the same network segment as the NPort 5200,
a connection is established directly from the NPort 5200. Otherwise, an attempt is made to
establish a connection through the given default gateway.
Gateway
Setting
Factory Default
Necessity
E.g., 192.168.1.1
blank
Optional
The gateway IP address identifies a network gateway that acts as an entrance to another network.
Usually, the computers that control traffic within the network or at the local Internet service
provider are gateway nodes. NPort 5200 needs to know the IP address of the default gateway
computer in order to communicate with hosts outside the local network environment. For correct
gateway IP address information, consult your network administrator.
IP configuration
Setting
Factory Default
Necessity
Static, DHCP, DHCP/BOOTP, BOOTP
Static
Required
ATTENTION
In Dynamic IP environments, the firmware will retry 3 times every 30 seconds until network
settings are assigned by the DHCP or BOOTP server. The Timeout for each try increases from 1
second, to 3 seconds, to 5 seconds.
If the DHCP/BOOTP Server is unavailable, the firmware will use the default IP address
(192.168.127.254), Netmask, and Gateway for IP settings.
DNS server 1 / DNS server 2
Setting
Factory Default
Necessity
E.g., 192.168.1.1
(IP addresses of the form
x
.
x
.
x
.0 and
x
.
x
.
x
.255 are invalid DNS server settings.)
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Optional
When the user wants to visit a particular website, the computer requests the website’s IP address
from a Domain Name System (DNS) server, and then the computer uses that IP address to connect
to the web server. DNS is used to identify Internet domain names, and to translate domain names
into IP addresses. A domain name is an alphanumeric name, such as moxa.com. A DNS server is a
host that translates this kind of text-based domain name into the numeric IP address used to
establish a TCP/IP connection.
In order to use NPort 5200’s DNS feature, you need to configure the DNS server. Doing so allows
NPort 5200 to use a host’s domain name to access the host. NPort 5200 provides
DNS server 1
and
DNS server 2
configuration items to configure the IP address of the DNS server. DNS Server
2 is used when DNS sever 1 is unavailable.
NPort 5200 plays the role of DNS client, in the sense that the NPort 5200 will actively query the
DNS server for the IP address associated with a particular domain name. NPort 5200 functions that
support domain name are
Time server
,
Destination IP Address in TCP Client mode
,
Server
,
SNMP trap server
, and
Auto report to IP
.
