XXXX@XXXX:~# ping 104.21.18.242 -I pppoe-wan
PING 104.21.18.242 (104.21.18.242): 56 data bytes
64 bytes from 104.21.18.242: seq=0 ttl=59 time=2.009 ms
64 bytes from 104.21.18.242: seq=1 ttl=59 time=3.733 ms
64 bytes from 104.21.18.242: seq=2 ttl=59 time=3.723 ms
64 bytes from 104.21.18.242: seq=3 ttl=59 time=1.750 ms
--- 104.21.18.242 ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max = 1.750/2.803/3.733 ms
XXXX@XXXX:~# ping 104.21.18.242 -I ximum
PING 104.21.18.242 (104.21.18.242): 56 data bytes
64 bytes from 104.21.18.242: seq=0 ttl=64 time=5.495 ms
64 bytes from 104.21.18.242: seq=1 ttl=64 time=5.081 ms
64 bytes from 104.21.18.242: seq=2 ttl=64 time=5.755 ms
64 bytes from 104.21.18.242: seq=3 ttl=64 time=5.697 ms
--- 104.21.18.242 ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max = 5.081/5.507/5.755 ms