This made me go nuts for a long time. As soon as you have two interfaces
running dhclient those two will start fighting over /etc/resolv.conf
which is realy bad when short lease times are used and one interface is
not getting new leases.
This diff extends the dhclient-script in such a way that dhclient will
only restore the "old" resolv.conf file if it actually is in charge of the
current file. With this the fighting does not stop but is less
noticable.
--
:wq Claudio
Index: dhclient-script
===================================================================
RCS file: /cvs/src/sbin/dhclient/dhclient-script,v
retrieving revision 1.17
diff -u -p -r1.17 dhclient-script
--- dhclient-script 2 Jun 2010 09:57:16 -0000 1.17
+++ dhclient-script 4 Nov 2010 11:18:59 -0000
@@ -111,21 +111,21 @@ add_new_resolv_conf() {
# $new_domain_name are provided. As reported in PR#3135, some ISPs
# provide only $new_domain_name_servers.
- rm -f /etc/resolv.conf.std
+ rm -f /etc/resolv.conf.$interface.std
if [ -n "$new_domain_name" ]; then
- echo "search $new_domain_name" >>/etc/resolv.conf.std
+ echo "search $new_domain_name" >>/etc/resolv.conf.$interface.std
fi
if [ -n "$new_domain_name_servers" ]; then
for nameserver in $new_domain_name_servers; do
- echo "nameserver $nameserver" >>/etc/resolv.conf.std
+ echo "nameserver $nameserver" >>/etc/resolv.conf.$interface.std
done
fi
- if [ -f /etc/resolv.conf.std ]; then
+ if [ -f /etc/resolv.conf.$interface.std ]; then
if [ -f /etc/resolv.conf.tail ]; then
- cat /etc/resolv.conf.tail >>/etc/resolv.conf.std
+ cat /etc/resolv.conf.tail >>/etc/resolv.conf.$interface.std
fi
# In case (e.g. during OpenBSD installs) /etc/resolv.conf
@@ -133,10 +133,9 @@ add_new_resolv_conf() {
# the new data in the correct location.
if [ -f /etc/resolv.conf ]; then
- cat /etc/resolv.conf > /etc/resolv.conf.save
+ cat /etc/resolv.conf > /etc/resolv.conf.$interface.save
fi
- cat /etc/resolv.conf.std > /etc/resolv.conf
- rm -f /etc/resolv.conf.std
+ cat /etc/resolv.conf.$interface.std > /etc/resolv.conf
# Try to ensure correct ownership and permissions.
chown -RL root:wheel /etc/resolv.conf
@@ -152,21 +151,21 @@ ip6_add_new_resolv_conf() {
# Create resolv.conf when either $new_dhcp6_name_servers or
# $new_dhcp6_domain_search are provided.
- rm -f /etc/resolv.conf.std6
+ rm -f /etc/resolv.conf.$interface.std6
if [ -n "$new_dhcp6_domain_search" ]; then
- echo "search $new_dhcp6_domain_search" >>/etc/resolv.conf.std6
+ echo "search $new_dhcp6_domain_search" >>/etc/resolv.conf.$interface.std6
fi
if [ -n "$new_dhcp6_name_servers" ]; then
for nameserver in $new_dhcp6_name_servers; do
- echo "nameserver $nameserver" >>/etc/resolv.conf.std6
+ echo "nameserver $nameserver" >>/etc/resolv.conf.$interface.std6
done
fi
- if [ -f /etc/resolv.conf.std6 ]; then
+ if [ -f /etc/resolv.conf.$interface.std6 ]; then
if [ -f /etc/resolv.conf.tail ]; then
- cat /etc/resolv.conf.tail >>/etc/resolv.conf.std6
+ cat /etc/resolv.conf.tail >>/etc/resolv.conf.$interface.std6
fi
# In case (e.g. during OpenBSD installs) /etc/resolv.conf
@@ -174,10 +173,9 @@ ip6_add_new_resolv_conf() {
# the new data in the correct location.
if [ -f /etc/resolv.conf ]; then
- cat /etc/resolv.conf > /etc/resolv.conf.save
+ cat /etc/resolv.conf > /etc/resolv.conf.$interface.save
fi
- cat /etc/resolv.conf.std6 > /etc/resolv.conf
- rm -f /etc/resolv.conf.std6
+ cat /etc/resolv.conf.$interface.std6 > /etc/resolv.conf
# Try to ensure correct ownership and permissions.
chown -RL root:wheel /etc/resolv.conf
@@ -256,8 +254,13 @@ EXPIRE|FAIL)
fi
# XXX Why add alias we just deleted above?
add_new_alias
- if [ -f /etc/resolv.conf.save ]; then
- cat /etc/resolv.conf.save > /etc/resolv.conf
+ if [ -f /etc/resolv.conf.$interface.std ]; then
+ cmp -s /etc/resolv.conf /etc/resolv.conf.$interface.std
+ if [ $? -eq 0 -a -f /etc/resolv.conf.$interface.save ]; then
+ cat /etc/resolv.conf.$interface.save > /etc/resolv.conf
+ fi
+ rm -f /etc/resolv.conf.$interface.save
+ rm -f /etc/resolv.conf.$interface.std
fi
;;
