Waters Network Systems GSM2108 Operating Manual page 27

DHCP, refer to Section 4.4 - IP Address Assignment.
Default: Disabled
IP address:
Users can configure the IP settings and enter new values if users set the DHCP function to
"Disable". Click the Apply button to update.
When DHCP is disabled, Default: 192.168.1.1
If DHCP is enabled, this field is completed by the DHCP server and will not allow user manually
set future IP addresses.
Subnet mask:
The purpose of the subnet mask is to get more network addresses. An IP device in a network
must own its IP address, composed of Network address and Host address, otherwise
communication with other devices cannot be made. The network classes A, B, and C are all too
large to fit for almost all networks, so the subnet mask is introduced to solve this problem.
Subnet mask uses some bits from host address and makes an IP address look at the Network
address, Subnet mask number and host address. It is shown in the following figure. This
reduces the total of IP numbers that a network is able to support by the power of 2.
The subnet mask is used to set the subnet mask value, which should be the same value as that
of the other devices resided in the same network it attaches.
Default gateway:
Set an IP address for a gateway to handle those packets that do not meet the routing rules
predefined in the device. If a packet does not meet the criteria for other pre-defined path, it must
be forwarded to a default router on a default path. This means any packet with undefined IP
address in the routing table will be sent to this device unconditionally.
Default: 192.168.1.254
DNS:
The Domain Name Server is used to serve the translation between IP address and name
address. The switch supports DNS client function to re-route the mnemonic name address to
DNS server to get its associated IP address for accessing Internet. You can specify a DNS IP
address for the switch. The switch can translate a mnemonic name address into an IP address.
There are two ways to specify the IP address of DNS. One is fixed mode, which manually
specifies its IP address, the other is dynamic mode, which is assigned by DHCP server while
DHCP is enabled. DNS can help you easily remember the mnemonic address name with the
meaningful words in it. No assignment of DNS address is made by default.
Default: 0.0.0.0
Waters Network Systems
32 bits
Network ID Host ID
Network ID
Subnet number
User's Manual
GSM-2108/GSM-1008SFP
Host ID
Page 27