With a full-blown ping6 the output looks like the following: ---- $ ping6 ff02::1%br0 PING ff02::1%br0(ff02::1) 56 data bytes 64 bytes from fe80::21e:68ff:fee2:da1a: icmp_seq=1 ttl=255 time=0.036 ms 64 bytes from fe80::222:b0ff:fe98:87fa: icmp_seq=1 ttl=64 time=114 ms (DUP!) ---- However, with busybox the from-address is wrongly displayed as the multicast address: ---- $ ping6 ff02::1%br-lan PING ff02::1%br-lan (ff02::1): 56 data bytes 64 bytes from ff02::1: seq=0 ttl=64 time=2.575 ms 64 bytes from ff02::1: seq=0 ttl=64 time=84.320 ms (DUP!) ---- I usually like to use ping6 ff02::1%ifname to find the addresses of the devices in my network again, when I forgot about them or don't want to look them up :). So basically the parameters given to unpack4() and unpack6() look wrong: http://git.busybox.net/busybox/tree/networking/ping.c#n618 http://git.busybox.net/busybox/tree/networking/ping.c#n647 Cheers, Linus
Committed the below patch as commit 5126cf9a15f9e5c3986be0fc2743b63adcc6b1fb Please confirm that current git works for you. If it doesn't, reopen this bug. diff -d -urpN busybox.4/networking/ping.c busybox.5/networking/ping.c --- busybox.4/networking/ping.c 2011-09-11 16:45:32.268689149 +0200 +++ busybox.5/networking/ping.c 2011-09-11 20:24:11.839444987 +0200 @@ -613,7 +613,7 @@ static void unpack4(char *buf, int sz, s } } #if ENABLE_PING6 -static void unpack6(char *packet, int sz, /*struct sockaddr_in6 *from,*/ int hoplimit) +static void unpack6(char *packet, int sz, struct sockaddr_in6 *from, int hoplimit) { struct icmp6_hdr *icmppkt; char buf[INET6_ADDRSTRLEN]; @@ -633,7 +633,7 @@ static void unpack6(char *packet, int sz if (sz >= sizeof(struct icmp6_hdr) + sizeof(uint32_t)) tp = (uint32_t *) &icmppkt->icmp6_data8[4]; unpack_tail(sz, tp, - inet_ntop(AF_INET6, &pingaddr.sin6.sin6_addr, + inet_ntop(AF_INET6, &from->sin6_addr, buf, sizeof(buf)), recv_seq, hoplimit); } else if (icmppkt->icmp6_type != ICMP6_ECHO_REQUEST) { @@ -783,7 +783,7 @@ static void ping6(len_and_sockaddr *lsa) move_from_unaligned_int(hoplimit, CMSG_DATA(mp)); } } - unpack6(G.rcv_packet, c, /*&from,*/ hoplimit); + unpack6(G.rcv_packet, c, &from, hoplimit); if (pingcount && nreceived >= pingcount) break; }