Deactivating The Dhcp/Bootp Protocol - W&T 57630 Manual

W&T
server is down, the previous IP address is maintained if there is
no reply.
1
I n D H C P e n v i r o n m e n t s t h e I P a d d r e s s t o b e
assigned must be reserved by a fixed entry in the DHCP
table with the Ethernet address of the Web-IO. Under WIndows
NT this is done in the DHCP manager under the menu item
„Reservations". Linux provides the file „dhcpd.conf" for this
purpose, in which a corresponding entry must be made.

2.5.1 Deactivating the DHCP/BOOTP protocol

A DHCP server assigns IP address dynamically from an address
pool assigned by the administrator. This means that DHCP-capable
devices usually get another IP address after each start. Since a
constantly changing IP address is not desired with the Web-IO, the
latter uses the BOOTP protocol based on fixed relationships
between Ethernet and IP address. DHCP servers should reply to
BOOTP requests only if they use explicit IP reservation for the
Ethernet address of the sender.
Some DHCP servers (e.g., Windows 2000 servers) however serve
both DHCP as well as BOOTP requests from their dynamic
address pool. To prevent the Web-IO from getting IP addresses
unknown to the user assigned in such environments, the
following options are available:
.
Before connecting the Web-IO to the network, you must
make a reservation in the respective DHCP server.
.
The IP address of the Web-IO is assigned through the serial
port. Sending „xxx" to the Web-IO during a new start takes you
to the input mode for a new IP address. Enter it followed by
the string „-0" (zero) to deactivate the BOOTP client of the
Web-IO (see section IP assignment through the serial port).
20
Assigning the IP address