mininet> pingall
*** Ping: testing ping reachability
h1 -> X X X
h2 -> X X X
h3 -> X X X
h4 -> X X X
*** Results: 100% dropped (0/12 received)
mininet>
mininet> h1 ping s5
PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_req=1 ttl=64 time=0.028 ms
64 bytes from 127.0.0.1: icmp_req=2 ttl=64 time=0.029 ms
64 bytes from 127.0.0.1: icmp_req=3 ttl=64 time=0.018 ms
64 bytes from 127.0.0.1: icmp_req=4 ttl=64 time=0.021 ms
64 bytes from 127.0.0.1: icmp_req=5 ttl=64 time=0.024 ms
64 bytes from 127.0.0.1: icmp_req=6 ttl=64 time=0.029 ms
^C
--- 127.0.0.1 ping statistics ---
6 packets transmitted, 6 received, 0% packet loss, time 5000ms
rtt min/avg/max/mdev = 0.018/0.024/0.029/0.007 ms
mininet> h1 ping s8
PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_req=1 ttl=64 time=0.026 ms
64 bytes from 127.0.0.1: icmp_req=2 ttl=64 time=0.063 ms
64 bytes from 127.0.0.1: icmp_req=3 ttl=64 time=0.022 ms
64 bytes from 127.0.0.1: icmp_req=4 ttl=64 time=0.036 ms
64 bytes from 127.0.0.1: icmp_req=5 ttl=64 time=0.017 ms
64 bytes from 127.0.0.1: icmp_req=6 ttl=64 time=0.033 ms
64 bytes from 127.0.0.1: icmp_req=7 ttl=64 time=0.026 ms
64 bytes from 127.0.0.1: icmp_req=8 ttl=64 time=0.020 ms
^C
--- 127.0.0.1 ping statistics ---
8 packets transmitted, 8 received, 0% packet loss, time 7000ms
rtt min/avg/max/mdev = 0.017/0.030/0.063/0.014 ms
mininet> s5 ping s8
PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_req=1 ttl=64 time=0.019 ms
64 bytes from 127.0.0.1: icmp_req=2 ttl=64 time=0.015 ms
64 bytes from 127.0.0.1: icmp_req=3 ttl=64 time=0.016 ms
64 bytes from 127.0.0.1: icmp_req=4 ttl=64 time=0.015 ms
64 bytes from 127.0.0.1: icmp_req=5 ttl=64 time=0.017 ms
^C
--- 127.0.0.1 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 3996ms
rtt min/avg/max/mdev = 0.015/0.016/0.019/0.004 ms
mininet> h1 ping s8
PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_req=1 ttl=64 time=0.026 ms
64 bytes from 127.0.0.1: icmp_req=2 ttl=64 time=0.020 ms
64 bytes from 127.0.0.1: icmp_req=3 ttl=64 time=0.024 ms
64 bytes from 127.0.0.1: icmp_req=4 ttl=64 time=0.020 ms
64 bytes from 127.0.0.1: icmp_req=5 ttl=64 time=0.026 ms
64 bytes from 127.0.0.1: icmp_req=6 ttl=64 time=0.022 ms
^C
--- 127.0.0.1 ping statistics ---
6 packets transmitted, 6 received, 0% packet loss, time 5000ms
rtt min/avg/max/mdev = 0.020/0.023/0.026/0.002 ms
mininet> s8 ping h1
--- 172.31.1.100 ping statistics ---
24 packets transmitted, 0 received, 100% packet loss, time 23053ms
I don't understand why.