Mentioned ARP race fix.

CHANGELOG

@@ -5,10 +5,21 @@ FUTURE
     problems with exoteric (/DSP) architectures showing these problems.
     We still have to fix some of these issues neatly.
 
+  * TODO: the ARP layer is not protected against concurrent access. If
+    you run from a multitasking OS, serialize access to ARP (called from
+    your network device driver and from a timeout thread.)
+
 HISTORY
 
 (HEAD)
 
+  2004-11-28 Leon Woestenberg <leon.woestenberg@gmx.net>
+  * etharp.*: Fixed race condition from ARP request to ARP timeout.
+    Halved the ARP period, doubled the period counts.
+    ETHARP_MAX_PENDING now should be at least 2. This prevents
+    the counter from reaching 0 right away (which would allow
+    too little time for ARP responses to be received).
+    
   2004-11-25 Leon Woestenberg <leon.woestenberg@gmx.net>
   * dhcp.c: Decline messages were not multicast but unicast.
   * etharp.c: ETHARP_CREATE is renamed to ETHARP_TRY_HARD.
@@ -66,7 +77,6 @@ HISTORY
     of raw_recv() in raw.h and so avoid compiler error.
   * sockets.c: Added trivial (int) cast to keep compiler happier.
   * ip.c, netif.c Changed debug statements to use the tidier ip4_addrN() macros.
-
   
 (STABLE-1_0_0)