Technical data

16
W&T
1.5.2 System Name
To suypport any automatic updating of the DNS system by the
DHCP server the W&T Web-IO Analog-In/Out identifies itself
within the DHCP protocol by its system name. The factory
default setting is WEBIO- followed by the last three places of
the Ethernet address. For example, the factory set system name
of a W&T Web-IO Analog-In/Out with Ethernet address
00:c0:3d:01.02.03 is WEBIO-010203. The system name of the
W&T Web-IO Analog-In/Out can be changed using Web Based
Management.
1.5.3 Lease Time
The lease time determined and sent by the DHCP server
specifies the term of the assigned IP address. After half the lea-
se time has expired the W&T Web-IO Analog-In/Out attempts to
extend or update the address. If this is not possible before the
lease time expires, for example because the DHCP server can
no longer be reached, the W&T Web-IO Analog-In/Out deletes
the IP address and begins a cyclical search for alternate DHCP
servers for assigning a new IP address.
The lease time associated with the current IP address is no
longer available after a reset. After restarting, therefore, a
corresponding update request is made by the original DHCP
server. If the server cannot be reached at this time the W&T Web-
IO Analog-In/Out deletes the IP address and begins a cyclical
search for alternate DHCP servers.
If DHCP is enabled, the remaining lease time together with the
current IP address is displaced in seconds in the menu path
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