System Name; Lease Time - W&T Com-Server++ Manual

W&T
Assigning the IP address
2�2�2 System name
To support any automatic updating of the DNS system by the
DHCP server, the Com-Server identifies itself within the DHCP
protocol with its system name. The factory default setting for
this is COMSERVER- followed by the last three places of the
Ethernet address. For example the factory set system name of
a Com-Server with the Ethernet address 00:c0:3d:01:02:03 is
COMSERVER-010203. The system name of the Com-Server can
be changed in the configuration. For additional information
refer to the section Menu: SETUP System r System Name.
2�2�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 Com-Server attempts
to extend the time for the assigned DHCP server and up up-
date 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 Com-Server 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 restart therefore a corresponding update request
is issued with the original DHCP server. If the latter is not
resolvable at this point in time, the Com-Server deletes the IP
address and starts a new cyclical search for alternate DHCP
servers.
If DHCP is activated, the remaining lease time together with
the current IP address is displayed in the menu item SE-
TUP System r Setup TCP/IP r IP-Address using the format
hh:mm:ss.
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