Red Hat Bugzilla – Bug 643890
dhclient refuses to prepend ipv6 nameservers
Last modified: 2016-12-22 05:08:28 EST
I've got eth1 interface with both ipv4 and ipv6 addresses. I'm trying to prepend another one DNS server by adding prepend domain-name-servers 8.8.8.8 ; to the corresponding config-file ( /etc/dhcp/dhclient-eth1.conf ). Everything is fine so far - I've got fully working /etc/resolv.conf : [root@work ~]# cat /etc/resolv.conf ; generated by /sbin/dhclient-script search example.ru nameserver 8.8.8.8 nameserver 192.168.0.6 nameserver 192.168.1.6 [root@work ~]# (I Removed actual IP addresses for two private DNS). Ok, now I'm trying to prepend IPv6 dns-resolver (public one, from Hurricane Electric) by adding the following line to /etc/dhcp/dhclient-eth1.conf : prepend domain-name-servers 2001:470:20::2 ; Ok, now restarting network with "service network restart" and all I get is two private dns: [root@work ~]# cat /etc/resolv.conf ; generated by /sbin/dhclient-script search example.ru nameserver 192.168.0.6 nameserver 192.168.1.6 [root@work ~]# and the following in my /var/lob/messages: Oct 18 16:40:25 work dhclient[10645]: /etc/dhcp/dhclient-eth1.conf line 1: semicolon expected. Oct 18 16:40:25 work dhclient[10645]: prepend domain-name-servers 2001: Oct 18 16:40:25 work dhclient[10645]: ^ Oct 18 16:40:25 work dhclient[10645]: /etc/dhcp/dhclient-eth1.conf line 1: expecting a statement. Oct 18 16:40:25 work dhclient[10645]: prepend domain-name-servers 2001:470:20::2 ; Oct 18 16:40:25 work dhclient[10645]: ^ Oct 18 16:40:25 work dhclient[10645]: /etc/dhcp/dhclient-eth1.conf line 3: semicolon expected. Oct 18 16:40:25 work dhclient[10645]: send Oct 18 16:40:25 work dhclient[10645]: ^
(In reply to comment #0) > prepend domain-name-servers 2001:470:20::2 ; correct is prepend dhcp6.name-servers 2001:470:20::2; (see dhcp-options(5) man page) but it seems that dhclient is really ignoring it. I'm trying to figure out what's wrong.
I asked upstream, but no response. https://lists.isc.org/pipermail/dhcp-users/2010-October/012126.html
I must admit that networking sub-system is really complex! I looked at the sources and sound something interesting (in /sbin/dhclient-script). I just added echo ${reason} right before "case "${reason}" in" in /sbin/dhclient-script and found that it gets PREINIT and REBOOT while has being configured for ipv4, but only PREINIT6 while has being configured for ipv6. The dhconfig function is called in case of "REBOOT" for ipv4 but dh6config is never called (no BOUND6|RENEW6|REBIND6|DEPREF6 parameter was ever passed to this script). I also looked at the dhcp client's sources and found that no BOUND6|RENEW6|REBIND6|DEPREF6 strings were ever hardcoded so dh6config have no chances to be called. So there are two possible issues - a) /sbin/dhclient-scrips is out of sync with dhclient (no BOUND6|RENEW6|REBIND6|DEPREF6 in dhclient) b) dhclient erroneously doesn't try to execute post-INIT hooks (REBOOT, in case of ipv4).
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Has already been fixed upstream https://source.isc.org/cgi-bin/gitweb.cgi?p=dhcp.git;a=commitdiff;h=a3471269e693cc4b49666874d5e57a6c9151b3b0 and will be part of 4.4.0 (currently in pre-alpha).