Perle 833IS, User Manual

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Configuring IP Protocol
98 Perle 833IS User Guide
DHCP DHCP (Dynamic Host Control Protocol) permits the management of IP addresses
and IP options from a centralized location. DHCP servers are used to assign
addresses to devices that do not require a fixed IP address. When an IP address is
required, the 833IS will request an address from the DHCP server. This address is
used for the duration of the connection. This is referred to as an address
lease .
If DHCP is enabled, the 833IS will give the dial in client an IP address that was
leased from the DHCP server. When the 833IS leases an address from the DHCP
server, it specifies the length of time of the lease. However, the 833IS will
automatically renew the lease to make sure that the client does not lose the use of the
address.
In DHCP, a “scope” is defined as “An administrative grouping of computers running
the DHCP client.” These computers are grouped according to a range of IP
addresses. Simply put, all dial-in clients on 833IS share the same scope, namely the
range of addresses defined for the Internal WAN network.
On the DHCP server, you must define a scope that matches the IP address range for
the dial-in clients on an Internal WAN network. Ensure that the IP address of the
Internal WAN network itself is excluded from the scope, so the DHCP server does
not attempt to assign this address to a dial-in client.
The 833IS cannot obtain its own IP address from the DHCP server using DHCP.
However, most DHCP servers can act as a BOOTP server.
The DHCP configuration screen allows you to set the characteristics of DHCP
support. The configuration screen is as follows: