W&T 58620, Manual

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W&T
Assigning the IP address
Subject to error and alteration
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 LAN-Modem deletes the IP address and starts
a new cyclical search for alternate DHCP servers.
1
If after the assigned lease time has expired the DHCP
server is not reachable, the LAN-Modem deletes its IP
address. All existing network connections with other network
clients are thereby closed. To prevent such events, we
recommend configuring the assigned lease time in the DHCP
server to infinite if possible.
2.3.4 Reserved IP addresses
A LAN-Modem provides services which other clients in the
network can make use of as needed. To open a connection, they
of course need the current IP address for the LAN-Modem, so
that in such situations it makes sense to reserve a particular IP
address for the LAN-Modem on the DHCP server. This is
generally done by linking the IP address to the unique Ethernet
address of the LAN-Modem, which can be found on the sticker
attached to the housing.
58xxx [Model]
EN=00c03d004a05
OK xxxxxx
Ethernet address
2.3.5 Dynamic IP addresses
Operation with dynamic address assignment, whereby the LAN
modem receives a different IP address after each restart of after
the lease time has expired, is not recommended, since the AT
dial-up command can be used only with numeric IP addresses.