Please show the output of the failed ping. Something like:
# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=58 time=29.5 ms
# ping 8.8.8.9
PING 8.8.8.9 (8.8.8.9) 56(84) bytes of data.
^C
--- 8.8.8.9 ping statistics ---
9 packets transmitted, 0 received, 100% packet loss, time 8127ms