--- firestarter/src/util.c	2003-06-12 20:50:21.000000000 +0300
+++ firestarter/src/util.c	2003-08-12 20:18:57.000000000 +0300
@@ -85,13 +85,14 @@
 }
 
 /* [ detect_netfilter ]
- * Return true if Linux 2.4 or 2.5 kernel found
+ * Return true if kernel supports netfilter (Linux 2.4 and newer)
  */
 gboolean
 detect_netfilter (void)
 {
 	FILE *f;
 	gchar buf[512];
+	char *ver;
 
 	/* The detection is only done once */
 	static gint detected = 0;
@@ -112,15 +113,17 @@
 		result = TRUE;
 	} else {
 		while (fgets (buf, 512, f) != NULL) {
-			if ((strstr (buf, " 2.4.") != NULL) || (strstr (buf, " 2.5.") != NULL)) {
-				g_print ("NETFILTER detected\n");
-
-				if (access("/sbin/modprobe", R_OK) == 0)
-					system ("/sbin/modprobe --autoclean ip_tables");
-				else
-					system ("`which modprobe` --autoclean ip_tables");
+			if (strstr (buf, "2.") != NULL){
+				ver = strstr (buf, "2.");
+				if(ver[2] >= '4') {
+					g_print ("NETFILTER detected\n");
+					if (access("/sbin/modprobe", R_OK) == 0)
+						system ("/sbin/modprobe --autoclean ip_tables");
+					else
+						system ("`which modprobe` --autoclean ip_tables");
 				
-				result = TRUE;
+					result = TRUE;
+				}
 			}
 		}
 		fclose (f);