About Dhcp; Cayman 2E-H As Dhcp Server - Cayman Systems 2E-H User Manual

About DHCP

Cayman 2E-H as
DHCP Server
Cayman 2E-H User's Guide
November 2000
When the Cayman 2E-H receives a packet, it looks up the packet's
MAC address in its bridging table. If the packet is addressed to a MAC
address in its bridging table, the Cayman 2E-H forwards the packet
on the appropriate network interface. (If the appropriate interface is
the one over which the packet was received, the Cayman 2E-H
ignores it, since no action would be required.) If the packet is
addressed to a MAC address that isn't in its bridging table, the
Cayman 2E-H relays the packet to all network interfaces other than
the one from which it received the packet. If it later receives a reply
from the destination host, it adds that host's MAC address and the
interface appropriate for reaching that host to its bridging table.
The Cayman 2E-H tracks the age of each entry in its bridging table,
and deletes entries that aren't used after 10 minutes. If more than
255 entries are active at the same time, the Cayman 2E-H discards the
oldest entries to make room for new ones.
Bridging of non-TCP/IP protocols is disabled by default. You must use
the CLI commands if you want your Cayman 2E-H to
set bridge
function as a network bridge.
The Dynamic Host Configuration Protocol (DHCP) allows one host
on a TCP/IP network to provide configuration information to other
hosts on that network. DHCP is built on a client-server model, where
designated DHCP servers allocate network addresses and deliver
configuration parameters to dynamically configured hosts. When
DHCP is enabled, the DHCP client requests configuration
information, such as an IP address and network information, from a
DHCP server each time it is restarted. The DHCP server responds to
the request by sending the client an IP address and information
about a network, such as the network's subnet mask, broadcast
address, name service information, authentication information, and
routing information.
The Cayman 2E-H can provide IP addresses for as many as 253
devices on the subnet connected to its Ethernet hub ports. When the
How Your Cayman 2E-H Works
C-3