3Com 3C840 manual 176 248, Table B-2IP Addresses

IP Addressing Basics B-7

2xx.xxx.188.176, and the subnet mask, 255.255.255.248, together to determine the number of addresses we had to work with.

First, we convert the last octet (the eight-bit decimal equivalent) of the IP address (176) and the last octet of the subnet mask (248) to binary:

176

248

The 0s in the subnet mask define our address range, and their three binary positions (23) yield eight addresses. The addresses that contain all zeroes and all ones (2xx.xxx.188.176 and 2xx.xxx.188.183, respectively--see the table below) are reserved as broadcast addresses and cannot be used.

Also, we were told that 2xx.xxx.188.177 would be assigned to the OfficeConnect Remote 840's LAN interface, so we can't assign it to any other computer(s) on the LAN.

Table B-2IP Addresses

Last Octet (In	Last Octet (In
Binary)	Decimal)	Status
10110 000	176	Reserved - broadcast address
10110 001	177	To be assigned to OfficeConnect Remote 840
10110 010	178	Available
10110 011	179	Available
10110 100	180	Available
10110 101	181	Available
10110 110	182	Available
10110 111	183	Reserved - broadcast address

IP Numbered and The OfficeConnect Remote 840 supports two types of IP addressing on Unnumbered Links the Remote Site links: numbered and unnumbered. A numbered link