Dynamic Host Configuration Protocol

Dynamic Host Configuration Protocol (DHCP) provides automatic addressing to clients.

TNSR can either allocate addresses to directly connected clients from a local DHCP daemon or it can act as a DHCP relay agent and forward address allocation requests to other DHCP servers.

• DHCP Configuration
  • DHCP Options
  • Subnet Configuration
  • Address Pool Configuration
  • Host Reservations
• DHCP Logging
  • DHCP Logging Options
  • DHCP Log Output
• DHCP Service Control and Status
  • Enable the DHCP Service
  • Disable the DHCP Service
  • Check the DHCP Service Status
  • View the DHCP Configuration
  • View the DHCP Lease Database
• DHCP Relay Agent
  • DHCP Relay Agent Configuration
  • Examples
  • Status

DHCP Service Example

Configure the DHCP IPv4 Service from configuration mode (Configuration Mode). This example uses the interface and subnet from Example Configuration:

tnsr(config)# dhcp4 server
tnsr(config-kea-dhcp4)# description LAN DHCP Server
tnsr(config-kea-dhcp4)# interface listen GigabitEthernet0/14/2
tnsr(config-kea-dhcp4)# lease lfc-interval 3600
tnsr(config-kea-dhcp4)# option domain-name
tnsr(config-kea-dhcp4-opt)# data example.com
tnsr(config-kea-dhcp4-opt)# exit
tnsr(config-kea-dhcp4)# subnet 10.2.0.0/24
tnsr(config-kea-subnet4)# id 1
tnsr(config-kea-subnet4)# pool 10.2.0.128-10.2.0.191
tnsr(config-kea-subnet4-pool)# exit
tnsr(config-kea-subnet4)# interface GigabitEthernet0/14/2
tnsr(config-kea-subnet4)# option domain-name-servers
tnsr(config-kea-subnet4-opt)# data 8.8.8.8, 8.8.4.4
tnsr(config-kea-subnet4-opt)# exit
tnsr(config-kea-subnet4)# option routers
tnsr(config-kea-subnet4-opt)# data 10.2.0.1
tnsr(config-kea-subnet4-opt)# exit
tnsr(config-kea-subnet4)# exit
tnsr(config-kea-dhcp4)# exit
tnsr(config)# dhcp4 enable
tnsr(config)#

The above example configures example.com as the domain name supplied to all clients. For the specific subnet in the example, the TNSR IP address inside the subnet is supplied by DHCP as the default gateway for clients, and DHCP will instruct clients to use 8.8.8.8 and 8.8.4.4 for DNS servers.

Note

The subnet definition requires an interface.