diff -up net-tools-1.60/arp.c.fgets net-tools-1.60/arp.c
--- net-tools-1.60/arp.c.fgets	2011-12-05 16:34:16.000000000 +0100
+++ net-tools-1.60/arp.c	2011-12-05 16:54:52.683352733 +0100
@@ -558,18 +558,21 @@ static int arp_show(char *name)
 	perror(_PATH_PROCNET_ARP);
 	return (-1);
     }
+    /* Count number of entries, in case file changes */
+    for (entries = 0; fgets(line, sizeof(line), fp); entries++);
+    entries--;
+    fseek (fp, 0L, SEEK_SET);
     /* Bypass header -- read until newline */
     if (fgets(line, sizeof(line), fp) != (char *) NULL) {
 	strcpy(mask, "-");
 	strcpy(dev, "-");
 	/* Read the ARP cache entries. */
-	for (; fgets(line, sizeof(line), fp);) {
-	    num = sscanf(line, "%s 0x%x 0x%x %99s %99s %99s\n",
-			 ip, &type, &flags, hwa, mask, dev);
-	    if (num < 4)
+	for (num = 0; num < entries; num++) {
+	    fgets(line, sizeof(line), fp);
+	    if (sscanf(line, "%s 0x%x 0x%x %99s %99s %99s\n",
+			 ip, &type, &flags, hwa, mask, dev) < 4)
 		break;
 
-	    entries++;
 	    /* if the user specified hw-type differs, skip it */
 	    if (hw_set && (type != hw->type))
 		continue;