BsAtHome writes in Bug 433:

Ping packets sent by busybox have wrong endian on f.x. mips32 (openwrt). Attatched is a patch that 
uses htons() and ntohs() to be platform independent.

1 files changed, 6 insertions, 5 deletions

diff --git a/networking/ping.c b/networking/ping.c
index bba37a025..b36ab1881 100644
--- a/networking/ping.c
+++ b/networking/ping.c
@@ -226,9 +226,9 @@ static void sendping(int junk)
         pkt->icmp_type = ICMP_ECHO;
         pkt->icmp_code = 0;
         pkt->icmp_cksum = 0;
-        pkt->icmp_seq = ntransmitted++;
+        pkt->icmp_seq = htons(ntransmitted++);
         pkt->icmp_id = myid;
-        CLR(pkt->icmp_seq % MAX_DUP_CHK);
+        CLR(ntohs(pkt->icmp_seq) % MAX_DUP_CHK);
 
         gettimeofday((struct timeval *) &packet[8], NULL);
         pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));
@@ -296,6 +296,7 @@ static void unpack(char *buf, int sz, struct sockaddr_in *from)
             return;                             /* not our ping */
 
         if (icmppkt->icmp_type == ICMP_ECHOREPLY) {
+                u_int16_t recv_seq = ntohs(icmppkt->icmp_seq);
             ++nreceived;
                 tp = (struct timeval *) icmppkt->icmp_data;
 
@@ -312,12 +313,12 @@ static void unpack(char *buf, int sz, struct sockaddr_in *from)
                 if (triptime > tmax)
                         tmax = triptime;
 
-                if (TST(icmppkt->icmp_seq % MAX_DUP_CHK)) {
+                if (TST(recv_seq % MAX_DUP_CHK)) {
                         ++nrepeats;
                         --nreceived;
                         dupflag = 1;
                 } else {
-                        SET(icmppkt->icmp_seq % MAX_DUP_CHK);
+                        SET(recv_seq % MAX_DUP_CHK);
                         dupflag = 0;
                 }
 
@@ -326,7 +327,7 @@ static void unpack(char *buf, int sz, struct sockaddr_in *from)
 
                 printf("%d bytes from %s: icmp_seq=%u", sz,
                            inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr),
-                           icmppkt->icmp_seq);
+                           recv_seq);
                 printf(" ttl=%d", iphdr->ttl);
                 printf(" time=%lu.%lu ms", triptime / 10, triptime % 10);
                 if (dupflag)