Fix ICMP and UDP IP checksums

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@871 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 6 insertions, 6 deletions

diff --git a/nuttx/net/uip/uip-icmpsend.c b/nuttx/net/uip/uip-icmpsend.c
index c0076b0e8..fc8ac2e83 100644
--- a/nuttx/net/uip/uip-icmpsend.c
+++ b/nuttx/net/uip/uip-icmpsend.c
@@ -92,7 +92,7 @@ void uip_icmpsend(struct uip_driver_s *dev, uip_ipaddr_t *destaddr)
 {
   if (dev->d_sndlen > 0)
     {
-      /* The total lenth to send is the size of the application data plus
+      /* The total length to send is the size of the application data plus
        * the IP and ICMP headers (and, eventually, the ethernet header)
        */
 
@@ -130,19 +130,19 @@ void uip_icmpsend(struct uip_driver_s *dev, uip_ipaddr_t *destaddr)
       ++g_ipid;
       ICMPBUF->ipid[0]     = g_ipid >> 8;
       ICMPBUF->ipid[1]     = g_ipid & 0xff;
-      ICMPBUF->ipoffset[0] = 0;
-      ICMPBUF->ipoffset[1] = 0;
+      ICMPBUF->ipoffset[0] = UIP_TCPFLAG_DONTFRAG >> 8;
+      ICMPBUF->ipoffset[1] = UIP_TCPFLAG_DONTFRAG & 0xff;
       ICMPBUF->ttl         = UIP_TTL;
       ICMPBUF->proto       = UIP_PROTO_ICMP;
 
+      uiphdr_ipaddr_copy(ICMPBUF->srcipaddr, &dev->d_ipaddr);
+      uiphdr_ipaddr_copy(ICMPBUF->destipaddr, destaddr);
+
       /* Calculate IP checksum. */
 
       ICMPBUF->ipchksum    = 0;
       ICMPBUF->ipchksum    = ~(uip_ipchksum(dev));
 
-      uiphdr_ipaddr_copy(ICMPBUF->srcipaddr, &dev->d_ipaddr);
-      uiphdr_ipaddr_copy(ICMPBUF->destipaddr, destaddr);
-
 #endif /* CONFIG_NET_IPv6 */
 
       /* Calculate the ICMP checksum. */