In the Windows environment, a DNS tunnel has been established, but you cannot ping through it.

I captured the packets on both the server and client using Wireshark, and the results are as follows: server： client： The client sent a ping packet to the server, and the server received the request and responded, but the client did not receive the server's response. I don't know why this is happening. I looked at other issues, and the TAP version they are using is tap-windows-9.9.2_3.exe