User manual
66
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Subnet Mask
Mask is corresponding 32 bits number of IP address. Some are 1, the others are 0. These 1 and 0 can be
combined arbitrary in principle, but the first continuous bits are 1 when designing subnet mask. IP
address can be divided into 2 parts by subnet mask: subnet address and host address. 1 in IP address
and subnet corresponds to subnet address, other bits are host address. A type of address corresponding
mask is 255.0.0.0; mask of B type address is 255.255.0.0; mask of C type address is 255.255.255.0.
Default Gateway
Default gateway in the host PC is generally called default route. Default route refer to a kind of router that
destination address of IP data packet will choose when it don‟t find other existing route. All data packets
of destination address which don‟t exist in the list of router will choose default route.
DNS Address
DNS (Domain Name Server) is for us to analyze domain to IP address of the Internet. If our
equipment needs to access a host, you need to use this server to resolve an IP address.
（
Figure 6.11.2
）
We can set the range of IP address as 192.168.x.x, 162.[16-31].x.x, or 10.x.x.x
NTP and EMAIL will use DNS service, please enter correct DNS address if use these two services.
