Get stale DNS information after PPP session starts

Binary package hint: ppp

When the ppp daemon establishes a connection, the /etc/ppp/ip-up.d/0000usepeerdns file is executed (after, the corresponding ip-down.d/0000usepeerdns file is also executed).

Where the pppd "usepeerdns" config options is used (most cases), the 0000usepeerdns scripts test for the nscd (name service cache daemon) being running incorrectly [1], so does not restart it.

The correct pid file to test for is /var/run/nscd/nscd.pid. Also, rather than restarting the service and flushing everything, it is better to invalidate just the hosts [2].

Diff against original files is in [3]. Apply with 'patch -l'.

--- [1]

if [ -e /var/run/nscd.pid ]; then
  /etc/init.d/nscd restart || true
fi

--- [2]

[ -e /var/run/nscd/nscd.pid ] && nscd -i hosts

--- [3]

--- ip-up.d/0000usepeerdns.orig 2007-01-16 18:06:12.000000000 +0000
+++ ip-up.d/0000usepeerdns 2007-01-16 18:06:57.000000000 +0000
@@ -25,8 +25,8 @@
 mv -f "$REALRESOLVCONF.tmp" "$REALRESOLVCONF"

 # restart nscd because resolv.conf has changed
-if [ -e /var/run/nscd.pid ]; then
- /etc/init.d/nscd restart || true
+if [ -e /var/run/nscd/nscd.pid ]; then
+ nscd -i hosts
 fi

 exit 0

--- ip-down.d/0000usepeerdns.orig 2007-01-16 18:08:58.000000000 +0000
+++ ip-down.d/0000usepeerdns 2007-01-16 18:09:20.000000000 +0000
@@ -15,8 +15,8 @@
   mv -f $REALRESOLVCONF.pppd-backup $REALRESOLVCONF

   # restart nscd because resolv.conf has changed
- if [ -e /var/run/nscd.pid ]; then
- /etc/init.d/nscd restart || true
+ if [ -e /var/run/nscd/nscd.pid ]; then
+ nscd -i hosts
   fi
 fi