问ddos高防4层+nginx无法获取到真实ip？

nginx服务器安装了toa模块，抓包可以看到syn包的option里面有真实ip，但是日志里面没有。

"-" "119.188.199.203"curl/7.81.0 - - [09/Feb/2022:22:08:12 +0800] "HEAD /1.jpg HTTP/1.1" 200 0 "-"

"-" "119.188.199.206"curl/7.81.0 - - [09/Feb/2022:22:08:24 +0800] "HEAD /1.jpg HTTP/1.1" 200 0 "-"

"-" "119.188.199.232"curl/7.81.0 - - [09/Feb/2022:23:12:18 +0800] "HEAD /1.jpg HTTP/1.1" 200 0 "-"

是个 -

请教一下。