How to setup a DHCP client in Solaris
Setting up a Solaris system as a DHCP client is fairly straight forward, it's just a matter of setting up files on your system...
Firstly, confirm that each NIC you want to setup connects to the network and has a file
/etc/hostname.<interface> associated with it. If not create the file association. For example:
# touch /etc/hostname.hme0
hme0 is the interface I wish to setup using DHCP.
If you have more than one network interface associated with the system then a
/etc/hostname.<interface>file must be created for each interface you wish to use.
dhcpagent is the DHCP client that runs on the Solaris OS. With this in place we can simply create an associated DHCP file for the interface we wish to use for DHCP. For example:
# touch /etc/dhcp.hme0
hme0 is the interface I wish to associate with DHCP.
If you have more than one network interface and if each of these receive an ip address from DHCP servers, then a
/etc/dhcp.<interface>file must be created for each of them.
This should make your Solaris system a DHCP client ready to receive it's IP address from the DHCP Servers.
When you reboot your system, the interface will be dynamically configured.
To bring up the interface using DHCP without rebooting, we can use the following commands:
ifconfig <interface> plumb ifconfig <interface> dhcp start
# ifconfig hme0 plumb # ifconfig hme0 dhcp start
The following command can be used to display the DHCP lease information:
ifconfig <interface> dhcp status
# ifconfig hme0 dhcp status
Likewise, the following command can be used to release the DHCP lease:
ifconfig <interface> dhcp release
# ifconfig hme0 dhcp release
Example 1 — DHCP wait time
By default, the system waits for upto 30 seconds for the DHCP Server to respond. However, this can be modified by entering the wait time in the
/etc/dhcp.<interface> file. For exmaple, if I decide to let my solaris system wait for 60 seconds then enter the wait time as follows:
# cat /etc/dhcp.hme0 wait 60
Example 2 — Setting primary interface
If it is a primary interface then this can be mentioned as follows:
# cat /etc/dhcp.hme0 wait 60 primary
NOTE: Setting the
primary keyword in the dhcp file can also be useful if your primary NIC has failed, by adding this entry to the next NIC forces the dhcpagent to focus on this interface first.
Editing "dhcpagent" configuration
By default the
dhcpagent will request the following from the DHCP server:
· Subnet Mask
· Default Router
· DNS Server
· DNS Domain Name
· Broadcast Address
· Encapsulated Vendor Options
This configuration is stored in
/etc/default/dhcpagent. For example:
# cat /etc/default/dhcpagent PARAM_REQUEST_LIST=1,3,6,12,15,28,43
The above line defines what is being requested from the DHCP Server. The following table lists each paramter used:
|15||DNS Domain Name|
|43||Encapsulated Vendor options (vendor specific information as desribed in RFC 2132)|
If you decide to not request for any of the above parameters then all you need to do is to remove the corresponding number from the
For example — No hostname request
If you do not want to request for the "Hostname" from the DHCP server, then simply remove the parameter "12" so it looks as follows:
After making you changes, simply save the file. Once the system restarts the hostname is not requested from the DHCP server.