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COMPOINT-LIB manual, Version 1.0
TCP/IP Network
Functional principal of the COMPOINT-LIB
in the TCP/IP network
For the communication of 2 participants of a TCP/IP network over different types it is
decided how the Subnet mask had been defined. Each participant of the network
determines with this mask which other IP participant can be reached. The target address
will this way be linked with the Subnet mask bit by bit AND – the result will be compared to
the target address which is extended by the Subnet mask. The value 0 in the Subnet
mask means that the address indication will not be analyzed in this place and the value
255 means that an analysis takes place.
Please find below some examples:
Proper address
123.49.89.13
Subnet Mask
255.255.0.0
The addresses 123.49.xxx.xxx, e.g. 123.49.200.10 or 123.49.30.3, etc. can be reached
but not 123.50.200.10
Proper address
123.49.89.13
Subnet Mask
255.255.255.0
The addresses 123.49.89.xxx, e.g. 123.49.89.10 or 123.49.89.3, etc. can be reached
but not 123.49.200.10
In order to have LAN connections over the router also a connection over the Subnet mask
needs to be released and the routing needs to be configured with a default Gateway entry
over the corresponding router.
