RFC 文档RFC 6333 - Dual-Stack Lite Broadband Deployments Following IPv4 Exhaustion8.5 Port Forwarding / Keep Alive (端口转发 / 保活)本页总览8.5 Port Forwarding / Keep Alive (端口转发 / 保活)8.5 Port Forwarding / Keep Alive (端口转发 / 保活) 此兼容页面用于保留 RFC 6333 小节链接. 本小节内容已合并在 8. NAT Considerations (NAT 考量).