Why didn't I see QUIC packets when I was using wireshark

[NotreDameDeParis]

I am using the examples of aioquic respectively on the client and server.However,when i was using wireshark,I found that no quic packets can i receive.What i recieve are just UDP packets.However,I can get the info that shows Congratulations, you loaded this page using HTTP/3!".Could you please tell me how this happens?

[SeaHOH]

If you are using Windows, to capture packet on localhost, a loopback adapter is needed.

[NotreDameDeParis]

I am using two Ubuntu virtual machines,one as a client and the other as a server.Then,I just used the example in aioquic and used wireshark.Unfortunately,I received no QUIC packets.

[tianyaqu]

Virtual machine softwares like virtualbox will create a netwok interface in the host system, you should capture on that interface.
To make it simple, you can capture the packets on server side, use the following command on the server shell, replace 'lo' with your listening interface and later analyse the quic.pcap file with wireshark, you will see all the quic packets.
tcpdump -i lo port 4433 -w quic.pcap

[NotreDameDeParis]

Virtual machine softwares like virtualbox will create a netwok interface in the host system, you should capture on that interface.
To make it simple, you can capture the packets on server side, use the following command on the server shell, replace 'lo' with your listening interface and later analyse the quic.pcap file with wireshark, you will see all the quic packets.
tcpdump -i lo port 4433 -w quic.pcap