Cayman Systems 2E-H-W, Руководство пользователя

Страница: 142 / 170

How Your Cayman 2E-H-W Works Cayman 2E-H-W User’s Guide
C-4
November 2000
Cayman 2E-H-W as
DHCP Server
The Cayman 2E-H-W can provide IP addresses for as many as 253
devices on the subnet connected to its Ethernet hub ports. When the
Cayman 2E-H-W receives a DHCP request from a client computer, it
determines what address to assign by checking its DHCP lease table
to identify an unused address in its DHCP range. When it finds an
address that should be free, the Cayman 2E-H-W sends a broadcast
message on the network to verify that no other host is using the same
IP address. If another host indicates that it is using the selected
address, the Cayman 2E-H-W selects another address and repeats the
sequence until it finds an address that is not in use.
Dynamic allocation of IP addresses means that an IP address can be
reused when it is not longer needed by the client to which it is
assigned. Dynamic IP address allocation is particularly useful in
situations where clients connect to a network temporarily or where
a site needs to share a limited pool of IP addresses among a group of
clients that do not need permanent IP addresses.
Cayman 2E-H-W as
DHCP Client
The Cayman 2E-H-W is configured at the factory to act as a DHCP
client on its WAN port. This means that, if substitute IP address
information is not configured for the WAN port, the Cayman 2E-H-W
will send a DHCP broadcast message asking for configuration
information from any available DHCP server. If a DHCP server is
active on the network connected to the WAN port, the Cayman
2E-H-W will accept and use the network configuration settings the
DHCP server provides to configure the Ethernet settings for the WAN
port.