Description: IP address of this entry. If it is the first interface (number 1, LAN), default value is 0.0.0.0. If it is another interface, default value is 0.0.0.(interface number). If it is requested a new row for an interface to which a row whith the default values already has been assigned, then default IP address will be 0.0.0.(number), where number is the highest interface number (which can have IP address) + 1. And if this IP address already exists, the following one to the last one which exists will be assigned to the interface (adding 1 to the fourth byte). If it is tried to realize a SET with an existing address in another interface, then it returns ERROR. It is allowed realizing a SET with the same address. If it is realized a SET to an address whose first byte is zero, then it only allows the 0.0.0.(number) format, where number is just like before. If the address first byte is zero, then the mask is 0.0.0.0.