Dhcp Server - Siemens SCALANCE XM-400 Configuration Manual

Industrial ethernet switches
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Configuring with Web Based Management
5.4 The "System" menu
The table has the following columns:
● Interface
Interface to which the setting relates.
● DHCP
Enable or disable the DHCP client for the relevant interface.
Procedure
1. Select the required mode from the "DHCP Mode" drop-down list. If you select the DHCP
mode "via DHCP Client ID" an input box appears.
– In the enabled input box "DHCP client ID" enter a string to identify the device. This is
2. Select the "DHCP Client Configuration Request (Opt. 66, 67) option", if you want the DHCP
client to use options 66 and 67 to download and then enable a configuration file.
3. Enable the "DHCP" option in the table.
4. Click the "Set Values" button.
Note
If a configuration file is downloaded, this can trigger a system restart. If the currently running
configuration and the configuration in the downloaded configuration file differ, the system
is restarted.
Make sure that the option "DHCP Client Configuration Request (Opt. 66, 67"is no longer
set.
5.4.9.2

DHCP Server

You can operate the device as a DHCP server. This allows IP addresses to be assigned
automatically to the connected devices. The IP addresses are either distributed dynamically
from an address band (pool) you have specified or a specific IP address is assigned to a
particular device.
Both with the dynamic and static assignment a pool is selected based on the following criteria:
1. With the DHCP query option 82 is enabled.
The DHCP server checks whether there is a pool with option 82. You configure this criterion
in the "Relay Agent Information" tab.
2. The DHCP query was received via a relay agent.
The DHCP server checks whether the relay agent is located in the subnet of a pool.
3. The port via which the DHCP query was received is enabled in the Port Range.
The DHCP server checks whether the IP interface of the port is located in the subnet of a
pool. You configure this criterion on the page "Layer 3 (IPv4) > Subnets".
During configuration make sure that the selection of the pool based on the criteria named is
possible. If the criteria match several pools, only one pool is selected. The other pools for which
the same criteria match are never selected.
174
then evaluated by the DHCP server.
SCALANCE XM-400/XR-500 Web Based Management (WBM)
Configuration Manual, 05/2017, C79000-G8976-C248-12

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