
Configuring the Z-Edge 64 as a DHCP server
Z-Edge 64 Configuration Guide
65
•
Dynamic address allocation, where the server chooses and allocates an IP
address with a finite lease. Dynamic addressing allows a device to be
assigned an IP address every time it connects to the network. If a device
reconnects to the network while the address lease is still active, the
Z-Edge 64 assigns it the same address. If the lease has expired, the device
gets a new address.
•
Static address allocation, where the server allocates the same IP address
every time a device connects to the network.
DHCP server profiles and scope
To configure the DHCP server on the Z-Edge 64 use the following profiles:
•
dhcp-server-options—Configures a default profile that is used to
generate default configurations for networks that are not explicitly
configured.
•
dhcp-server-subnet—Defines options for a specific network that is being
managed by the DHCP server. Settings in the dhcp-server-subnet record
override the default address pool set up by the dhcp-server-options
record.
•
dhcp-server-group—Defines options for a set of clients in a given
domain. Inclusion of a given client into the group is based on a substring
match of either the client’s DHCP vendor class identifier, its DHCP client
identifier values, or both. The scope of a group object always overrides
those of a subnet object for any DHCP client lease.
•
dhcp-server-host—Defines options for a specific host within a given
domain.
•
ip-interface-record—enables DHCP on the interface. The IP address
defined in the ip-interface-record is used to determine the DHCP
address pool for the attached network.
The DHCP server looks for configuration settings in order from the most
specific record (the dhcp-server-host) to the most general (the
dhcp-server-options record). It uses parameter settings in the following
order:
1.
dhcp-server-host
2.
dhcp-server-group
3.
dhcp-server-subnet
4.
dhcp-server-options
If a parameter is set in multiple profiles (for example, lease times or default
routers), the Z-Edge 64 uses the settings that are in the most specific record.
This means that the DHCP server could use parameter settings in multiple
records (if, for example, all client lease times were set in the
dhcp-server-options record, and address ranges were set in the
dhcp-server-subnet records.)