Re: dhclient: avoiding hostname disclosure via DHCP request

[Dan Williams <dcbw redhat com>]

On Wed, 2014-10-15 at 12:36 +0000, Robert Horovitz wrote:
> Dan wrote (2014-01-06):
> > > This turns out to be a bug in the 'ifcfg-rh' config file parsing plugin.
> > > I've fixed it in git upstream, but a temporary workaround would be:
> > >
> > > DHCP_HOSTNAME=wont-be-used
> > > DHCP_SEND_HOSTNAME=no
> > >
> > > DHCP_SEND_HOSTNAME was only parsed if DHCP_HOSTNAME was also given.
> >
> > NM version:
> > NetworkManager-0.9.8.8-2.fc19.x86_64
> >
> > I tried it in my FC20 VM, there it works fine, I guess I have one more
> > reason to upgrade then.
>
>
> The steps that previously worked back in January do not work on a F20
> now? (I upgraded from F19 -> F20).
>
> I'm using:
> NetworkManager-0.9.9.0-45.git20131003.fc20.x86_64
>
> and added these lines:
>
> > > DHCP_HOSTNAME=wont-be-used
> > > DHCP_SEND_HOSTNAME=no
>
> to
> /etc/sysconfig/network-scripts/ifcfg-<SSID>
>
> Did anything change in this regard? How can I prevent hostname
> disclosure via DHCP requests nowadays?

I'm not quite sure why that worked in 0.9.8.8 since the patches that
read/write DHCP_SEND_HOSTNAME only got added in December 2013, long
after both those versions came out.  But...

I've backported those patches to F20 for you, can you try:

https://admin.fedoraproject.org/updates/NetworkManager-0.9.9.0-46.git20131003.fc20

and let me know if it fixes the issue?

Dan