Red Hat Bugzilla – Bug 67901
dhclient does not get DNS or hostname information from DHCP server
Last modified: 2008-05-01 11:38:02 EDT
I filed this against dhcp, since there was no entry for dhclient. :P Description of Problem: dhclient does not appear to have any mechanism to acquire DNS or hostname information from the DHCP server, none of the included configuration utilities address this concern at all. both pump & dhcpcd perform this behavior in their default configurations. How Reproducible: Always Steps to Reproduce: 1. Install Limbo with dhclient (default) 2. Raise eth0 as DHCP. 3. Watch as nothing is entered into /etc/resolv.conf or as a hostname. 4. Rinse and repeat as many times as desired, with no change. Actual Results: No entries added to /etc/resolv.conf or hostname. Expected Results: Valid DNS servers put in /etc/resolv.conf, hostname set to correct entry. All this information comes from the DHCP server (which is running dhcpd on my Red Hat Linux 7.3 gateway box) Additional Information: The simple resolution to this is: rpm -e dhclient rpm -Uvh dhcpcd*.i386.rpm Perhaps Red Hat should reconsider using such a broken (or perhaps simply cryptic and undocumented) client as its default DHCP utility.
I noticed this too, and located the problem (or at lease some of the problem in /sbin/dhclient-script) I modified the make_resolv_conf function to not REQUIRE both DNS info and DOMAIN info to be available for a resolv.conf update to take place... Like this -- snip ------------------------------------------ function make_resolv_conf() { if [ "x$new_domain_name" != "x" ] || [ "x$new_domain_name_servers" != "x" ]; then echo "; resolv.conf - generated by dhclient-script!" >/etc/resolv.conf if [ "x$new_domain_name" != "x" ];then echo search $new_domain_name >>/etc/resolv.conf fi if [ "x$new_domain_name_servers" != "x" ]; then for nameserver in $new_domain_name_servers; do echo nameserver $nameserver >>/etc/resolv.conf done fi fi } -- snip ------------------------------------------ This does the trick regarding the DNS servers missing from the resolv.conf It's likely that there could be even more problems with this setup, regarding options for domain (not just search) or others, but i'm not quite sure for the moment
The fix tmus posted makes some sense, I'll stick it in. Please try dhclient-3.0pl1-3 when it shows up in rawhide shortly, and see if it resolves the problem.
I installed the new RPM here and it seems to me this bug was fixed
Taking the confirmation from tmus along with my own findings with dhclient-3.0pl1-4 and closing this bug out.