Comment 8 for bug 1032855

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Thomas Hood (jdthood) wrote :

I wrote:
> If resolvconf is installed then dhclient calls resolvconf, otherwise it
> writes to /etc/resolv.conf directly. For details please read the
> make_resolv_conf() function in /sbin/dhclient-script.

And for details of what happens when resolvconf is installed, look at /etc/dhcp/dhclient-enter-hooks.d/resolvconf.