Technical data

17
W&T
Subject to errors and modifications
1
If the DHCP server is no longer accessible after expiration
of the lease time, the W&T Web-IO Analog-In/Out deletes
its IP address. All existing TCP/UDP connections between the
W&T Web-IO Analog-In/Out and other network clients are
thereby closed. To prevent such situations, we recommend
configuring the assigned lease time in the DHCP server to infini-
te whenever possible.
1.5.4 Reserved IP addresses
The W&T Web-IO Analog-In/Out provides services which can
make use of the other clients in the network as needed. Of
course the current IP address of the W&T Web-IO Analog-In/Out
is needed by these clients in order to open a connection, so
that in these cases it makes sense to reserve a particular IP
address for the W&T Web-IO Analog-In/Out. This is generally
done by linking the IP address to the unique Ethernet address
of the unit, which can be found on the sticker on the housing.
58xxx [Typ]
EN=00c03d004a05
OK xxxxxx
Ethernet-Adresse
1.5.5 Dynamic IP addresses
Fully dynamic address assignment, whereby the Web-IO Ana-
log-In/Out is given a different IP address after each restartor
after the lease time expires, is only practical in network
environments with automatic cross-linking between the DHCP
and DNS services. This means when assigning a new IP address
to the Web-IO Analog-In/Out, the DHCP server automatically
updates the DNS system as well. The new address is assigned
to the respective domain name. For detailed information about
your network environment, consult your systems administrator
when in doubt.
For time server requests, sending e-mails or other client
applications where the device itself actively seraches for server