W&T 58620, Manual

Page: 18 / 89

18
W&T
Assigning the IP address
•
Serial port
As part of serial IP assignment, the following options for
deactivating/activating DHCP and BOOTP can be selected
directly following the address string:
-0
r
Deactivates DHCP and BOOTP/RARP
-1
r
Activates BOOTP/RARP
-2
r
Activates DHCP
A detailed description of the procedure can be found in the
section on
Serial assignment of IP, subnet mask and
gateway .
2.3.2 System Name
To support any automatic updating of the DNS system by the
DHCP server, the LAN-Modem identifies itself within the DHCP
protocol with its system name. The factory default setting for
this is
LanModem- followed by the last three places of the
Ethernet address. For example the factory set system name of
a LAN-Modem with the Ethernet address 00:c0:3d:01:02:03 is
LanModem_010203 . The system name of the LAN-Modem can
be changed in the configuration. For additional information
refer to the section
Extended configuration of the Lan-Modem.
2.3.3 Lease-Time
The lease time determined and transmitted by the DHCP server
specifies the Time-To-Live of the assigned IP address. After half
the lease time has expired, the LAN-Modem attempts to extend
the time for the assigned DHCP server and up update the
address. If this is not possible by the time the lease time
expires, for example because the DHCP server can no longer
be reached, the LAN-Modem deletes the IP address and starts a
new cyclical search for alternate DHCP servers for the purpose
of assigning a new IP address.
Because of the absent clock, the lease time associated with the
current IP address is no longer available after a reset. After the