In our work and daily life, we often need to remotely access home or private networks, whether it is due to the requirements of remote work, monitoring smart home devices, or enterprises accessing internal resources across regions. Due to cost considerations and restrictions imposed by network operators, these private networks often do not have a public IP assigned. While this practice reduces the risk of network attacks and enhances privacy protection, it also restricts the ability to directly access these internal resources from the Internet, which can be inconvenient.