Twin Ethernet configuration: Internet Netmask

Configure->InternetConfig->Netmask

When you have a Twin-Ethernet configuration, this field should be set to the Internet Netmask of the Server. This value will have been advised to you by your ISP.

A Netmask must always be provided alongside an IP Address to specify how many IP addresses there are on the network. In more technical terms, the Netmask tells the computer which bits of the IP address can change and the address still be part of the network.

For example a Netmask of "255.255.255.240" specifies that the last four bits of the IP Address can change and still be an address on the network (240 is 11110000 in binary). Looking at it mathematically, all IP addresses that give the same result when you perform a a bit-wise AND between the IP address and the Netmask are considered to be on the same network

There is no default value for this field.