Setting up FileZilla to only listen for a certain domain

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http://serverfault.com – Somebody had been trying to brute force my FTP server with a username the doesn't even exist, but it got me thinking I should upgrade my security. It would be impractical to filter by IP as the places I access it from will have dynamic IP, but I was thinking of setting up a Dynamic Domain service which points to my computer and then only allowing connections to filezilla from that domain. However when I try to set up IP filtering on FileZilla using the domain it says invalid IP (As it obviously isn't an IP) So is there a solution to this? Use a different FTP server that can do it, plugin f (HowTos)