Hi
You need to add the network interface to the command, you can find the interface with ifconfig, eg in my case en0;
iPhone:~ root# ifconfig
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet xxx.xxx.xxx.xxx
iPhone:~ root# traceroute -i en0 google.com
traceroute: Warning: google.com has multiple addresses; using 173.194.115.104
traceroute to google.com (173.194.115.104), 64 hops max, 40 byte packets
....
i got it…it’s so easy finally😄