diff -up sos-2.2/sos/plugins/system.py.orig sos-2.2/sos/plugins/system.py
--- sos-2.2/sos/plugins/system.py.orig  2012-10-15 20:45:22.210349614 +0100
+++ sos-2.2/sos/plugins/system.py       2012-10-15 20:45:26.852301886 +0100
@@ -19,6 +19,8 @@ class system(sos.plugintools.PluginBase)
     """
     def setup(self):
         self.addCopySpec("/proc/sys")
+        self.addForbiddenPath("/proc/sys/net/ipv6/neigh/*/retrans_time")
+        self.addForbiddenPath("/proc/sys/net/ipv6/neigh/*/base_reachable_time")
         self.addCopySpec("/etc/sysctl.conf")
         self.addCopySpec("/etc/cron*")
         self.addCopySpec("/etc/anacrontab")