dhclient reads the file dhclient.conf for configuration instructions.

It then gets a list of all the network interfaces that are configured in the current system

Usage

Usage

opts:

-r     Release  the current lease and  stop the running DHCP client as previously recorded in the PID file.

-n     Do  not  configure  any  interfaces.

-v     Enable verbose log messages.

-d     Force dhclient to run as a foreground process.(implies -v)

lease-file

(-lf <lease-file>)

cat /var/lib/dhcp/dhclient.leases

lease {
  interface "eth0";
  fixed-address 192.168.123.140;
  option subnet-mask 255.255.255.0;
  option routers 192.168.123.1;
  option dhcp-lease-time 43200;
  option dhcp-message-type 5;
  option domain-name-servers 192.168.123.1;
  option dhcp-server-identifier 192.168.123.1;
  option dhcp-renewal-time 21600;
  option broadcast-address 192.168.123.255;
  option dhcp-rebinding-time 37800;
  option host-name "webpy";
  option domain-name "lan";
  renew 2 2018/03/06 15:14:25;
  rebind 2 2018/03/06 20:13:14;
  expire 2 2018/03/06 21:43:14;
}