Retaining information between DHCP requests

Bill Shirley Bill at
Fri Oct 10 00:57:45 UTC 2014

On 10/9/2014 7:23 PM, CLOSE Dave wrote:
> Bill Shirley wrote:
>> Does kickstart send the hostname every time?
> Actually, it doesn't seem to send hostname ever. The only potentially
> useful field unique to kickstart in any of the messages is the
> vendor-class-identifer. And that appears only in the first DISCOVER/REQUEST.
> However, following up on Sten's suggestion, I find that the initrd does
> contain a dhclient.conf file. All it contains now is,
>   > request subnet-mask, broadcast-address, time-offset, routers,
>   >         domain-name, domain-name-servers, domain-search, host-name,
>   >         root-path, interface-mtu;
> Perhaps I can add something to this file.

According to the above request list, it should be asking for a host-name from the server. You didn't see one in the tcpdump?
Something like:
             Parameter-Request Option 55, length 20:
               Subnet-Mask, BR, Time-Zone, Default-Gateway
               Domain-Name, Domain-Name-Server, Option 119, Hostname
               Netbios-Name-Server, Netbios-Scope, MTU, Classless-Static-Route
               NTP, MDHCP, PRTR, Option 192
               Option 202, Option 203, Option 137, Option 191

Also, is there a send section in dhclient.conf?
         send { [ option declaration ]
        [, ... option declaration ]}

        The send statement causes the client to send the specified options to
        the server with the specified values.  These are full option
        declarations as described in dhcp-options(5).  Options that are
        always sent in the DHCP protocol should not be specified here, except
        that the client can specify a requested dhcp-lease-time option other
        than the default requested lease time, which is two hours.  The other
        obvious use for this statement is to send information to the server
        that will allow it to differentiate between this client and other
        clients or kinds of clients.


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <>

More information about the dhcp-users mailing list