3Com 3C16710 manual Bk IPADDRES.FRM Page 5 Tuesday, October 7, 1997 1138 AM

16710.bk : IPADDRES.FRM Page 5 Tuesday, October 7, 1997 11:38 AM

The bits of the subnet mask are set to 1 if the device should treat the corresponding bit in the IP address as part of the original network number or as part of the subnet number. These bits in the mask are set to 0 if the device should treat the bit as part of the device number, as shown in Figure B-1.

Figure B-1 Using A Subnet Mask To Obtain The Subnet Address

CAUTION: To ensure that Quick Config Manager can always communicate with the hub, the IP subnet 192.168.101.x is permanently assigned to the SLIP port in addition to the user configurable SLIP address. Do not use this subnet for your Ethernet (network).

IP Addresses B-5

Assigning IP Addresses to a Small, Contained Network

If you have a small network (less than 255 devices) that you do not plan to connect to the Internet then here is a guide as to what you can use for the IP addresses and subnet mask:

■Use an IP address that is in the range 192.000.001.xxx to 223.255.254.xxx (Class C) to define your network, and allocate device numbers (the xxx part of the IP address), starting from 1.

■Use a dummy subnet mask of 255.255.255.0 to match the network portion of your IP addresses.

Remember that no two devices on a network may have the same IP address.