Ftp software showing incorrect ip address

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Hey, i recently switched to a airport extreme router, and have noticed in my ftp software the user's ip's are shown incorrectly. I'm using rumpus and the ip address is shown as my routers ip, it worked perfectley fine before i switched t the airport extreme. The ftp service is working (users can login and transfer files) just it shows the wrong ip (so all my ip bans no longer work)

Anyone have any ideas?

thanks
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