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FreeBSD Force DHCP Client (dhclient) to Renew IP Address To Get A New Lease
I have a Linux DD-WRT router DHCP server running on my network. How can I force my FreeBSD based dhcp client to get a new lease from this Linux based router? What is the command in FreeBSD equivalent to Windows’ “ipconfig /renew” command?
The dhclient command, provides a means for configuring one or more network interfaces using the Dynamic Host Configuration Protocol, BOOTP protocol, or if these protocols fail, by statically assigning an address.
dhclient interface-name-here dhclient [options] interface-name-here
The name of the interface must be specified on the command line. You must run this command as the root user.
How can I see the current IP address settings?
Type the following command:
ifconfig ifconfig interface ifconfig em0 ifconfig em0 | grep inet
How can I renew or release an IP in FreeBSD for em0 interface?
$ sudo dhclient em0 ####################################### ## OR first use 'su -' and then type ## ####################################### # dhclient em0
Other options in FreeBSD to renew dhcp IP address
You can also use the following command to renew dhcp IP address for em0:
service dhclient restart em0 ## OR ## /etc/rc.d/dhclient restart em0
Stopping dhclient. Starting dhclient. DHCPREQUEST on em0 to 255.255.255.255 port 67 DHCPACK from 192.168.1.254 bound to 192.168.1.142 -- renewal in 43200 seconds.
In order to keep track of leases across system reboots and server restarts, dhclient keeps a list of leases it has been assigned in the /var/db/dhclient.leases.IFNAME file. IFNAME represents the network interface of the DHCP client (e.g., em0), one for each interface:
tail -f /var/db/dhclient.leases.em0
less /var/db/dhclient.leases.em0
lease interface "em0"; fixed-address 192.168.1.142; next-server 192.168.1.254; option subnet-mask 255.255.255.0; option routers 192.168.1.254; option domain-name-servers 192.168.1.254; option host-name "freebsd10"; option broadcast-address 192.168.1.255; option dhcp-lease-time 86400; option dhcp-message-type 5; option dhcp-server-identifier 192.168.1.254; option dhcp-renewal-time 43200; option dhcp-rebinding-time 75600; renew 0 2015/2/1 21:38:04; rebind 1 2015/2/2 06:38:04; expire 1 2015/2/2 09:38:04; lease interface "em0"; fixed-address 192.168.1.142; next-server 192.168.1.254; option subnet-mask 255.255.255.0; option routers 192.168.1.254; option domain-name-servers 192.168.1.254; option host-name "freebsd10"; option broadcast-address 192.168.1.255; option dhcp-lease-time 86400; option dhcp-message-type 5; option dhcp-server-identifier 192.168.1.254; option dhcp-renewal-time 43200; option dhcp-rebinding-time 75600; renew 0 2015/2/1 21:44:47; rebind 1 2015/2/2 06:44:47; expire 1 2015/2/2 09:44:47;
See dhclient man page for more info on a FreeBSD server:
$ man dhclient