22
W&T
TCP/IP Configuration
After the administrator has made the necessary entries, the
LAN-Modem will automatically obtain the desired IP address
after each reset. To ensure the availability of the LAN-Mo-
dem even should the DHCP/BOOTP server fail, the previous
IP address is kept if no reply comes.
1
In DHCP environments the IP address to be assigned
must
be reserved by means of a fixed link to the
Ethernet address of the LAN-Modem. Under Windows NT this
is done in the DHCP manager under the menu item Reservat-
ions. Linux provides the file
dhcpd.conf
for this purpose, in
which a corresponding entry must be added.
3.4.1 Deactivating the DHCP-/BOOTP protocol
A DHCP server assigns IP addresses dynamically from an
address pool provided by the administrator. This means
that DHCP-compatible devices usually receive another IP
address after starting. Since a constantly changing IP
address is not something you want to have with the LAN-
Modem, the latter uses BOOTP protocol, which is based
o n f i x e d E t h e r n e t - t o - I P a d d r e s s a s s i g n m e n t s . D H C P
servers should reply to BOOTP requests only if they have
an explicit IP reservation for the Ethernet address of the
sender.
Some DHCP servers (e.g. Windows 2000 servers) however
use both DHCP and BOOTP requests from their dynamic
address pool. To prevent the LAN-Modem from being
assigned unknown IP addresses in such environments,
the following options are available:
•
A reservation must be made in the respective DHCP
s e r v e r b e f o r e c o n n e c t i n g t h e L A N - M o d e m t o t h e
network.
Summary of Contents for 58210
Page 1: ...Release 1 2 March 2002 Model 58210 58220 58610 58620 Manual LAN Modem W T...
Page 6: ...6 W T...
Page 26: ...26 W T...
Page 56: ...56 W T...
Page 62: ...62 W T Appendix Declaration of conformity...
Page 63: ...W T...