Hirschmann RS20 User Manual page 26

Entering the IP Parameters
Using DHCP Option 82.
You choose this "in-band" method if you want to configure the installed
device using DHCP Option 82. You need a DHCP server with Option 82
for this. The DHCP server assigns the configuration data to the device
using its physical connection
DHCP Option
Configuration via the Web-based interface.
If the device already has an IP address and can be reached via the
network, then the Web-based interface provides you with another option
for configuring the IP parameters.
26
(see page 49 "System Configuration via
82").
Basic Configuration
Release 6.0 07/2010