The FTP protocol: How does the AE manage inbound packets?

I've noticed the following with resect to how the AE handles NAT port forwarding for the FTP protocol.
1. Forwarding for FTP service seems to only work if the WAN port is 21, e.g. map 21 -> 21 works, 2121 -> 21, does not work (packets seem to be dropped at the AE). However, such a restriction hold with other services such like ssh or openvpn.
2. When ftp packets are received by the LAN server, they have the IP of the client stripped and arrive at the server with the WAN IP assigned to the AE, as indicated by the logs. Again, other services that we are forwarding to the server arrive with the correct client IP. So this is only an FTP thing.
The AE seems to do some analysis of incoming packets and treat them differently. One question:
Why does the Airport Extreme do this, and apparently only for FTP packets?

I found a workaround by changing the port my FTP server listens to from 21 to 2121. I then set the AE to forward port 21 on the WAN side to 2121 on the LAN side. This allows the server to know what IP the client is connecting from.
I'm still curious why the AE strips the client's IP when you forward to port 21 on the LAN side.

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    I wouldn't care success or failure,for I will only struggle ahead as long as I have been destined to the distance.

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    Best regards!
    I wouldn't care success or failure,for I will only struggle ahead as long as I have been destined to the distance.

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