root@varkey:~# ping -I pppoe-wan 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
64 bytes from 8.8.8.8: seq=0 ttl=56 time=90.249 ms
64 bytes from 8.8.8.8: seq=1 ttl=56 time=326.154 ms
64 bytes from 8.8.8.8: seq=2 ttl=56 time=240.751 ms
64 bytes from 8.8.8.8: seq=3 ttl=56 time=225.193 ms
64 bytes from 8.8.8.8: seq=4 ttl=56 time=220.712 ms
64 bytes from 8.8.8.8: seq=5 ttl=56 time=191.016 ms
64 bytes from 8.8.8.8: seq=6 ttl=56 time=38.357 ms
64 bytes from 8.8.8.8: seq=7 ttl=56 time=27.690 ms
64 bytes from 8.8.8.8: seq=8 ttl=56 time=27.981 ms
64 bytes from 8.8.8.8: seq=9 ttl=56 time=29.504 ms
64 bytes from 8.8.8.8: seq=10 ttl=56 time=36.559 ms
64 bytes from 8.8.8.8: seq=11 ttl=56 time=36.583 ms
64 bytes from 8.8.8.8: seq=12 ttl=56 time=43.350 ms
64 bytes from 8.8.8.8: seq=13 ttl=56 time=63.216 ms
64 bytes from 8.8.8.8: seq=14 ttl=56 time=83.265 ms
64 bytes from 8.8.8.8: seq=15 ttl=56 time=97.306 ms
64 bytes from 8.8.8.8: seq=16 ttl=56 time=46.129 ms
64 bytes from 8.8.8.8: seq=17 ttl=56 time=38.372 ms
64 bytes from 8.8.8.8: seq=18 ttl=56 time=27.544 ms
^C
--- 8.8.8.8 ping statistics ---
19 packets transmitted, 19 packets received, 0% packet loss
round-trip min/avg/max = 27.544/99.470/326.154 ms