No Packet captured by Wireshark when using mininet inside Python

Question

I'm doing this Simple OSPF mininet Experiment.

https://github.com/qyang18/Mininet-Quagga

Using mininet-vm, installed Quagga and confirm it's working.

Open QuaggaOSPF.py by

$ sudo python QuaggaOSPF.py

I got

mininet> pingall
*** Ping: testing ping reachability
h1 -> h2 r1 r2
h2 -> h1 r1 r2
r1 -> h1 h2 r2
r2 -> h1 h2 r1
*** Results: 0% dropped (12/12 received)

All things are set, but I can't capture any packet by Wireshark from it.

No any packets

No any packets

But run mininet directly at bash, Wireshark can catpure packets correctly.

$ sudo mn --topo minimal


*** Creating network
*** Adding controller
*** Adding hosts:
h1 h2
*** Adding switches:
s1
*** Adding links:
(h1, s1) (h2, s1)
*** Configuring hosts
h1 h2
*** Starting controller
c0
*** Starting 1 switches
s1 ...
*** Starting CLI:
mininet> pingall
*** Ping: testing ping reachability
h1 -> h2
h2 -> h1
*** Results: 0% dropped (2/2 received)

Got Packets

How can Wireshark capture packets from mininet inside Python?