Siemens SIMATIC NET SCALANCE S615 Configuration Manual page 192

Configuring with Web Based Management
4.5 "System" menu
Description
The page contains the following boxes:
● Keep Alive
When this is enabled, the IP address is retained in the event of a connection breakdown and
is not reset to 0.0.0.0. Keep Alive is enabled by default. When Keep Alive is disabled, the IP
address is reset to 0.0.0.0 in the event of a communication breakdown.
● DHCP Client Configuration Request (Opt. 66, 67)
When enabled, the DHCP client uses the options to download the configuration file (option
67) from the TFTP server (option 66). After the restart, the device uses the data from the
configuration file.
Note
Configuration file and firmware version
The configuration file is used to store and read in configuration data within a firmware
version, e.g. 4.3. Configuration files created with a firmware version <4.2 cannot be read in
to a device with a firmware version 4.3.
● DHCP Mode
Specify the type of identifier with which the DHCP client logs on with its DHCP server.
– via MAC Address
– via DHCP Client ID
– via System Name
– via Iaid and Duid
Note
DHCP mode "via PROFINET device name"
With firmware version 5.0, the setting "via PROFINET device name" was removed.
192
Identification is based on the MAC address.
Identification is based on a freely defined DHCP client ID.
Identification is based on the system name. If the system name is 255 characters long,
the last character is not used for identification.
With this the DHCP client can log on with DHCP servers that support parallel operation
of IPv4 and IPv6.
The identification is via the IAID and the DUID and identifies precisely one IP interface
of the device.
IAID (Interface Association Identifier): At least one IAID is generated for each IP interface
The IAID remains unchanged when the DHCP client restarts
DUID (DHCP Unique Identifier): Uniquely identifies server and clients and applies to all
IP interfaces of the device. The DUID remains unchanged when there is a restart.
SCALANCE S615 Web Based Management
Configuration Manual, 11/2019, C79000-G8976-C388-08