--- procps-3.2.7/sysctl.c.kzak	2007-04-03 01:26:01.000000000 +0200
+++ procps-3.2.7/sysctl.c	2007-04-03 01:26:13.000000000 +0200
@@ -63,6 +63,44 @@
 static const char ERR_PRELOAD_FILE[] = "error: unable to open preload file \"%s\"\n";
 static const char WARN_BAD_LINE[] = "warning: %s(%d): invalid syntax, continuing...\n";
 
+/* Ignore deprecated sysctls
+ * -- we use this list when we scan (DisplayAll) /proc/sys only. We don't use it
+ *    in case when user direcly uses deprecated key. It's better when user can read
+ *    an error message from kernel.
+ */
+struct sysctl_ignore {
+	const char *prefix;
+	int        prefix_len;
+	const char *option;
+	int        option_len;
+};
+
+#define IGNORE_ENTRY(prefix, option) \
+		{ prefix, sizeof(prefix)-1, option, sizeof(option)-1 }
+
+static struct sysctl_ignore Ignore[] =
+{
+	IGNORE_ENTRY( "net.ipv6.neigh", "base_reachable_time" ),
+	IGNORE_ENTRY( "net.ipv6.neigh", "retrans_time" )
+};
+
+static bool IsIgnored(const char *name)
+{
+  unsigned int i;
+  int sz = strlen(name);
+
+  for (i = 0; i < sizeof(Ignore)/sizeof(struct sysctl_ignore); i++) {
+     struct sysctl_ignore *p = &Ignore[i];
+
+     if (sz < (p->prefix_len + p->option_len))
+	     continue;
+
+     if (strncmp(name, p->prefix, p->prefix_len) == 0 &&
+         strcmp(name + (sz - p->option_len), p->option) == 0)
+       return true;
+  }
+  return false;
+}
 
 static void slashdot(char *restrict p, char old, char new){
   p = strpbrk(p,"/.");
@@ -122,7 +160,7 @@
  *     Read a sysctl setting 
  *
  */
-static int ReadSetting(const char *restrict const name) {
+static int ReadSetting(const char *restrict const name, bool useign) {
    int rc = 0;
    char *restrict tmpname;
    char *restrict outname;
@@ -145,6 +183,12 @@
    outname = strdup(name);
    slashdot(outname,'/','.'); /* change / to . */
 
+   if (useign && IsIgnored(outname)) {
+     free(outname);
+     free(tmpname);
+     return rc;
+   }
+
    if (stat(tmpname, &st)==0) {
 	if (st.st_mode & (S_IRUSR|S_IROTH|S_IRGRP))	   
 	   	fp = fopen(tmpname, "r");
@@ -257,7 +301,7 @@
                strcat(tmpdir, "/");
                DisplayAll(tmpdir);
             } else {
-               rc |= ReadSetting(tmpdir+strlen(PROC_PATH));
+               rc |= ReadSetting(tmpdir+strlen(PROC_PATH), true);
             }
          }
          free(tmpdir);
@@ -519,7 +563,7 @@
          if (WriteMode || index(*argv, '='))
             ReturnCode = WriteSetting(*argv);
          else
-            ReturnCode = ReadSetting(*argv);
+            ReturnCode = ReadSetting(*argv, false);
       }
    }