Enabling/Disabling The Dhcp Relay Support - Siemens RX1500 User Manual

Chapter 5
Setup and Configuration
Figure 328: Dynamic Host Control Protocol (DHCP) server Form
1. Enabled Check Box
3. Configure the following parameter(s) as required:
Parameter
enabled
4. Click Commit to save the changes or click Revert All to abort. A confirmation dialog box appears. Click OK
to proceed.
5. Click Exit Transaction or continue making changes.
Section 5.15.3

Enabling/Disabling the DHCP Relay Support

If DHCP relay (or Option 82) clients are used on the same subnet as the DHCP server, some clients will try to
renew a lease immediately after receiving it by requesting a renewal directly from the DHCP server. Because the
DHCP server is configured by default to only provide the lease through a relay agent configured with the current
Option 82 fields, the server sends the client a NAK protocol message to disallow the lease. Enabling Option
82 disables the NAK protocol message so that the renewal request sent from the DHCP relay agent (which the
DHCP server accepts since it has the correct Option 82 fields added) is the only message for which the client
receives a reply.
NOTE
Option 82 support should only be enabled If the DHCP server and clients are on the same subnet.
NOTE
The meaning of most Option 82 fields is determined by the DHCP relay client. To determine which
values are required by the client for special options, refer to the client documentation.
NOTE
DHCP relay support can also be enabled on an individual subnet. For more information, refer to
Section 5.15.7.3, "Configuring Subnet
To enable or disable DHCP relay support on the DHCP server, do the following:
Change the mode to Edit Private or Edit Exclusive.
1.
2. Navigate to services » dhcpserver » options. The Client Options form appears.
312
1
Description
Enables and disables the the DHCP server.
Options".
Enabling/Disabling the DHCP Relay Support
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