===在NTU设置FTP遇到的IP问题===俺刚刚在NTU搞了一个FTP,用ipconfig命令得到俺机器的ip是：172.20.192.xxx.
用这个ip，NTU内部的人可以连上FTP，外面的不可以。
为了让校外的也能联上，俺照TEENSPIRIT讲过的办法，去FTP.SINGNET.COM.SG，发现自己的public ip address是：155.69.189.xxx. 俺去no-ip.com申请了一个redirect, 它也自动detect到我的ip是155.69.189.xxx。
现在的问题是，用这个public ip,外面的可以进，但是不可以看见任何文件，请指教。
need to take care
of firewall traversal problems.
a set of issues relating to active and passive server mode will have to be thoroughly understood and resolved.
alternatively, you can replicate the settings used by FTP admins in similar situation.
a set of issues relating to active and passive server mode will have to be thoroughly understood and resolved.
alternatively, you can replicate the settings used by FTP admins in similar situation.
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