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I wanted to put this in the dhclient.conf file:

supersede domain-name "foo.org foo2.org";

but there is no dhclient.conf file...where is it? (Fedora14/GNOME)

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I believe that you would use /etc/dhclient.conf which isn't created by default, so you would create it yourself of course.

From reading the dhclient man page, you could also run dhclient with the -cf flag to specify a config file.
For example:

dhclient -cf ~/dhclient.conf
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up vote 0 down vote accepted
vim /etc/dhcp/dhclient-eth0.conf
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For NetworkManager managed ehternet ports, you might look for the file /var/run/nm-dhclient-ethX.conf.

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