Leica GPS1200+, Technical Reference Manual, Page: 445 / 1442

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<Network
Mask:> User input Used together with the IP address to identify the
network the receiver is on. It is a 32 bit number which
must be obtained from the network administrator or
the Internet service provider.
The format of the network mask is aaa.bbb.ccc.ddd
where aaa is a value ranging from 001 to 255 and
bbb, ccc and ddd are values ranging from 000 to 255.
<Gateway IP
Address:> User input The IP address of a local default IP router on the
same network. It is used to forward traffic to destina-
tions beyond the local network.
A gateway is the connection or interchange point that
connects separate IP networks. For example a
L ocal
A rea N etwork may need a gateway to connect it to
the Internet.
Field Option Description