eduardo@debian:~$ docker run -it --rm busybox
/ # ping 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=54 time=32.611 ms
64 bytes from 8.8.8.8: seq=1 ttl=54 time=16.220 ms
^C
--- 8.8.8.8 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 16.220/24.415/32.611 ms
/ # eduardo@debian:~$ docker run -it --rm busybox
/ # ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
^C
--- 8.8.8.8 ping statistics ---
6 packets transmitted, 0 packets received, 100% packet loss
/ # exit
eduardo@debian:~$ sudo service docker restart
eduardo@debian:~$ docker run -it --rm busybox
/ # ping 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=54 time=12.769 ms
64 bytes from 8.8.8.8: seq=1 ttl=54 time=13.807 ms
^C
--- 8.8.8.8 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 12.769/13.288/13.807 ms
/ # exit
eduardo@debian:~$ docker run -it --rm busybox
/ # ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
^C
--- 8.8.8.8 ping statistics ---
4 packets transmitted, 0 packets received, 100% packet loss
/ # eduardo@debian:~$

Linux debian 4.9.0-4-amd64 #1 SMP Debian 4.9.65-3+deb9u1 (2017-12-23) x86_64 GNU/Linux

17.12.0-ce, build c97c6d6
18.03.1-ce, build 9ee9f40