The test in /etc/rc.d/dhclient that is supposed to prevent dhclient from being launched if one is already running doesn't work with the ports version of dhclient. If you have an interface configured for dhcp in /etc/rc.conf, dhclient runs and gets a lease normally but then is run again later at which point it sets the interface address to 0.0.0.0, ending network access via that NIC. Fix: The simplest solution is to check /var/run/dhclient.pid in addition doing the pgrep test that's already in the rc script. The appended patch implements this. A more complete solution would be to also change the base version of dhclient to manage the /var/run/dhclient.pid file and remove the pgrep test from the rc.d script. (If there is interest in that, I'd be happy to generate the diffs.) ------- =_aaaaaaaaaa0 Content-Type: text/plain; name="a.txt"; charset="us-ascii" Content-ID: <47530.1151537075.2@fun.ee.lbl.gov> *** dhclient 2006/06/14 18:16:09 1.1 --- dhclient 2006/06/14 18:16:19 *************** ------- =_aaaaaaaaaa0----T3zBGClqXPJCVx5GZstuYFZ501UWiePJjgBUE19M8ffluOmU Content-Type: text/plain; name="file.diff" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="file.diff" *** 18,28 **** --- 18,40 ---- dhclient_start() { + local f rc_flags pid pids + # prevent unnecessicary restarts # XXX: should use a pidfile if [ -x /usr/bin/pgrep ]; then pids=`/usr/bin/pgrep -f "dhclient: $ifn(\$| .*)"` if [ -n "$pids" ]; then + exit 0 + fi + fi + + # deal with isc dhclient too + f="/var/run/dhclient.pid" + if [ -s ${f} ]; then + pid="`cat ${f}`" + kill -0 "${pid}" >/dev/null 2>&1 + if [ $? -eq 0 ]; then exit 0 fi fi How-To-Repeat: Install the isc-dhcp3-client and configure a NIC to use it: ifconfig_em0="dhcp" Then reboot. The interface will come up when dhclient runs. Later when it's run again, you'll see this message: Internet Systems Consortium DHCP Client V3.0.3 Copyright 2004-2005 Internet Systems Consortium. All rights reserved. For info, please visit http://www.isc.org/products/DHCP Listening on BPF/em0/00:30:48:00:00:01 Sending on BPF/em0/00:30:48:00:00:01 Can't bind to dhcp address: Address already in use Please make sure there is no other dhcp server running and that there's no entry for dhcp or bootp in /etc/inetd.conf. Also make sure you are not running HP JetAdmin software, which includes a bootp server. At this point the original dhclient is still running but the interface is misconfigured and you're hosed.
Responsible Changed From-To: freebsd-bugs->freebsd-rc Over to maintainer(s).
State Changed From-To: open->closed Duplicate of conf/95905