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Can we set hostname using the DHCP ?

Posted on 2009-02-15
Medium Priority
Last Modified: 2013-12-27
Suppose I have modified my /etc/hosts and /etc/nodename as 'foo'
and at DHCP server my IP address bound to my MAC address and associated hostname is 'bar'

so when I request from DHCP for auto host configuration, will my hostname would be changed from 'foo' to 'bar' ??
Question by:beer9
LVL 10

Expert Comment

ID: 23647247
No, dhclient (The DHCP Client daemon) does not set your hostname to what it receives in a lease (by default).

LVL 10

Expert Comment

ID: 23647249
If you want custom host names bound to specific IP's use an internal DNS server...
- add that server into the DHCP lease
- add the hosts into the DNS records
LVL 22

Accepted Solution

Brian Utterback earned 500 total points
ID: 23649356
Actually, Solaris does set the hostname of the system from what it receives in the DHCP
request, if the DHCP server supplies one. In some of the initial releases of Solaris this was
a problem, because many DHCP servers do not supply one, and the /etc/nodename file was
only used if DHCP was not. As a result, the hostname became set to "unknown", which was
the default hostname used when DHCP did not supply a hostname.  It took awhile before
Solaris was modified to use what was in /etc/nodename as a default instead of "unknown".
Since many people wanted the /etc/nodename to override what it got from DHCP, different
versions of Solaris have used different algorithms to ultimately set the hostname.

However, you may find that in many cases Solaris (10 and before at least, not sure about
OpenSolaris) may not pick up a host name when other systems do. While DHCP can
supply a hostname, in many Windows networks it does not, relying on the Windows naming
service to provide the hostname. If that is the case, Solaris will not pick up the hostname and
will end up using the default.
LVL 40

Expert Comment

ID: 23651839
please see the file /etc/default/dhcpagent which contains some info in this regard and a parameter

Author Closing Comment

ID: 31547201
Thanks blu!

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