Siemens RUGGEDCOM ROX II User Manual page 284

Chapter 7
IP Address Assignment
maximum { maximum }
4. Configure the client settings by configuring the following parameter(s):
IMPORTANT!
For IPv4 only:
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
(negative acknowledgment or not acknowledged) message to disallow the lease. Enabling Option
82 disables the NAK message so 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.
Option 82 support should only be enabled If the DHCP server and clients are on the same subnet.
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.
DHCP relay support can also be enabled on individual subnets.
• For IPv4
unknown-client { unknown-client }
option82
authorize-server
• For IPv6
unknown-client { unknown-client }
authorize-server
5. [Optional] Configure configuration options for DHCP clients at the subnet level. For more information, refer to
refer to Section 7.3.5.1, "Configuring Standard DHCP Client Configuration Options (IPv4)"
"Configuring Standard DHCP Client Configuration Options
6. Configure one or more address pools to the subnet. For more information, refer to
an Address Pool (IPv4)"
7. Configure one or more IP ranges to the subnet. For more information, refer to
Range (IPv4)" or
238
Parameter
The minimum leased time in seconds that the server offers to the clients.
Synopsis: A 32-bit unsigned integer
Default: 7200
The maximum leased time in seconds that the server offers to the clients.
Parameter
Synopsis: { allow, deny, ignore }
The action to take for previously unregistered clients
Enables/disables the NAK of option 82 clients for this subnet.
Enables/disables the server's authorization on this client. If enabled, the server will
send deny messages to the client that is trying to renew the lease, which the server
knows the client shouldn't have.
Parameter
Synopsis: { allow, deny, ignore }
The action to take for previously unregistered clients
Enables/disables the server's authorization on this client. If enabled, the server will
send deny messages to the client that is trying to renew the lease, which the server
knows the client shouldn't have.
or Section 7.3.12.2, "Adding an Address Pool
Section 7.3.14.2, "Adding an IP Range
Description
Description
Description
(IPv6)".
(IPv6)".
Section 7.3.13.2, "Adding an IP
(IPv6)".
RUGGEDCOM ROX II
CLI User Guide
or Section 7.3.5.2,
Section 7.3.11.2, "Adding
Configuring Subnet Options