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Re: how to get F12 to 'send host-name' in dhcp request?

M. Milanuk wrote:
On 12/17/2009 2:47 AM, Tom Horsley wrote:
On Wed, 16 Dec 2009 21:29:46 -0800
M. Milanuk wrote:

Can someone help me out here?  This is driving me nutty.  How do I make
F12 send the right request to the dhcp server?

Every distro seems to do this differently (sometimes each distro
changes between releases :-), but for fedora/redhat what has
always worked for me is to edit the ifcfg-eth0 script
and add:


to the parameters.

Hello Tom,

Thanks for the help. I took a look in that script, and I see what you're talking about. I may end up going that route in the end, or just editing the dnsmasq.conf file on the server to use dhcp-client-id instead of dhcp-host.

In the mean time, its still bugging me as to what exactly is going on here. On further inspection, the /var/run/nm-dhclient-eth0.conf files for both the F12 machine and the U9.10 machine are nearly the same they *both* have Network Manager adding the same line to the end ('send dhcp-client-identifier "demandred" '), but the file in U9.10 looks like they just copied over /etc/dhcp3/dhclient.conf (which they still have) into the NM file, with one line uncommented:

    send host-hame "<hostname>";

I don't know if that gets expanded when the script is run to take the machines hostname and send it as part of the dhcp request, and thats why it gets the proper dhcp lease as it should, and F12 doesn't?

From the sounds of things, it appears I'm going to have to learn a bit about wireshark and start trying to capture the network traffic when the client machines send their dhcp requests and see what is and isn't being sent.

Learning wireshark and tcpdump are valuable goals for anyone who is getting into checking that network traffic is proper.

I thought I had taken the easy way out by just setting the MAC address of virtual machines so I can control the name and IP address in one place. Nothing I see in this thread makes me think there's a better way. ;-)

Having all the name/IP/MAC information in one place has made my life easier many times, both for administration and documentation.

Bill Davidsen <davidsen tmr com>
  "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot

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