dtls-psk: use ping -6 to ping an ipv6 address

This is necessary in centos7 images.

Resolves: #200

Signed-off-by: Nikos Mavrogiannopoulos <n.mavrogiannopoulos@gmail.com>

diff --git a/tests/dtls-psk b/tests/dtls-psk
index f8af5ad97b0142e114cea84898f292fef096477f..4185fbfcf700e9e35c68a22e117a983eca4f8a14 100755 (executable)
--- a/tests/dtls-psk
+++ b/tests/dtls-psk
@@ -140,7 +140,7 @@ ${CMDNS1} nuttcp -T 6 -t ${VPNADDR}
 
 ${CMDNS2} nuttcp -1
 
-${CMDNS1} ping -c 3 ${VPNADDR6}
+${CMDNS1} ping -6 -c 3 ${VPNADDR6}
 
 echo " * Receiving with nuttcp"