NPort 5100 Series User’s Manual
Web Console Configuration
5-6
Netmask
Setting
Factory Default
Necessity
E.g., 255.255.255.0
255.255.255.0
Required
A subnet mask represents all of the network hosts at one geographic location, in one building, or
on the same local area network. When a packet is sent out over the network, the NPort 5100 will
use the subnet mask to check whether the desired 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 5100, a
connection is established directly from the NPort 5100. Otherwise, the connection is established
through the given default gateway.
Gateway
Setting
Factory Default
Necessity
E.g., 192.168.1.1
None
Optional
A gateway is 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 5100 needs to know the IP address of the default gateway computer in order
to communicate with the hosts outside the local network environment. For correct gateway IP
address information, consult the 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.)
None Optional
When the user wants to visit a particular website, the computer asks a Domain Name System
(DNS) server for the website’s correct IP address, and then the computer uses the response to
connect to the web server. DNS is the way that Internet domain names are identified and translated
into IP addresses. A domain name is an alphanumeric name, such as moxa.com, that it is usually
easier to remember. 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 5100’s DNS feature, you need to configure the DNS server. Doing so allows
NPort 5100 to use a host’s domain name to access the host. NPort 5100 provides DNS server 1
and DNS server 2 configuration items to configure the IP address of the DNS server. DNS Server
2 is included for use when DNS sever 1 is unavailable.
NPort 5100 plays the role of DNS client, in the sense that the NPort 5100 will actively query the
DNS server for the IP address associated with a particular domain name. NPort 5100 functions that
support domain name are
Time server, Destination IP Address in TCP Client mode, Mail
Server, SNMP trap server,
and
Auto report to IP
.
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