IP addresses with ::ffff: prefix are IPv6 addresses which are mapped to
IPv4. Therefore ping resulting IPv4 address.
# ./busybox ping -c1 -v ::ffff:127.0.0.1
IPv4-Mapped-in-IPv6 address, using IPv4 127.0.0.1
PING 127.0.0.1 (127.0.0.1): 56 data bytes
64 bytes from 127.0.0.1: seq=0 ttl=64 time=0.085 ms
Cc: Tj <[email protected]>
Signed-off-by: Petr Vorel <[email protected]>
---
Changes v1->v2:
* Add example in the commit message.
networking/ping.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/networking/ping.c b/networking/ping.c
index b7e6955a9..7ed58f9d6 100644
--- a/networking/ping.c
+++ b/networking/ping.c
@@ -986,6 +986,14 @@ static int common_ping_main(int opt, char **argv)
af = AF_INET;
if (opt & OPT_IPV6)
af = AF_INET6;
+
+ struct in6_addr a6;
+ if (inet_pton(AF_INET6, hostname, &a6) &&
IN6_IS_ADDR_V4MAPPED(&a6)) {
+ hostname = strrchr(hostname, ':') + 1;
+ af = AF_INET;
+ printf("IPv4-Mapped-in-IPv6 address, using IPv4 %s\n",
hostname);
+ }
+
lsa = xhost_and_af2sockaddr(hostname, 0, af);
}
#else
--
2.45.2
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