Setup guide
Dedicated Micros ©2006
78
DS2 Network Guide
Alternatively it is possible to identify the supported ports and also determine who is connected to the
unit via a telnet session.
At the prompt enter:
TCP Ports
The information displayed should look like this.
IP Address Range and Subnet
When entering a range of IP addresses in the Firewall it is necessary to calculate the relevant
subnet that does not mask out the rst IP address to the last IP address in the range. The following
shows the gures that are entered in the IP address eld and/or the subnet mask.
Note: For details on how these gures are calculated please refer to Appendix E.
The address can be written in two ways:
IP address/number of bits no subnet mask – 192.168.3.1/24
IP address and subnet mask – 192.168.3.1 255.255.255.0
If you wanted to add an address range to include IP address 1 to 12, then you would need to nd
the nearest IP address and subnet that would encompasses this requirement, use the table below to
assist you with conguring this function.
The table shows the address range including the number of bits allocated to the network address,
the equivalent subnet mask for this range of addresses and the IP address that will be included in
the range, (we will use the IP address of 192.168.3.1 for the example).
Note: A host cannot be allocated an IP address of 0 or 255, which means there are really only up
to 254 host addresses available in the example.
IP address Network address Included IP Address Range
192.168.3.1/24 255.255.255.0 0 - 255
192.168.3.1/25 255.255.255.128 0 - 127