Auto-Ip Addressing; Private Ip Addresses - 3Com OfficeConnect User Manual

Auto-IP Addressing

Network devices use automatic IP addressing if they are
configured to acquire an address using DHCP but are unable to
contact a DHCP server. Automatic IP addressing is a scheme
where devices allocate themselves an IP address at random from
the industry standard subnet of 169.254.x.x (with a subnet mask
of 255.255.0.0). If two devices allocate themselves the same
address, the conflict is detected and one of the devices allocates
itself a new address.
Automatic IP addressing support was introduced by Microsoft in
the Windows 98 operating system and is also supported in
Windows 2000/XP/NT.

Private IP Addresses

The following address ranges have been reserved by the Internet
Engineering Task Force (IETF) for private use:
10.0.0.0 – 10.255.255.255
172.16.0.0 – 172.31.255.255
192.168.0.0 – 192.168.255.255
The Router has a default subnet of 192.168.1.0 –
192.168.1.255. 3Com recommends that you use this subnet for
the LAN addresses of your first Device and subsequent ranges
(192.168.2.0 – 192.168.2.255) for the LAN range of other
Devices that you will connect to by VPN.
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