The term "公网VPN IP" refers to a Virtual Private Network (VPN) installed or set up over the internet, using the internet itself as its public backbone. This setup is used for testing or security purposes, such as bypassing firewall restrictions, minimizing server load, or comparing VPN configurations. While it may seem redundant compared to a local VPN, it serves specific needs like network testing or security checks. Key considerations include its use for remote access, testing network performance, or security assessments.