Blocking IP's

[PcDad]

Using a Linksys BEFSR41 with port fowarding setup for an FTP server. Everything works fine but what I want to know is, is there a way to block certain ip's or ip ranges from being forwarded from the outside?? I know I can do it on the LAN, but what about the WAN??? I've been thru all the router setup pages, etc. but don't see it there...Any help would be greatly appreciated...

TIA

[Jedis]

I don't believe there is a way... I'm using the same Linksys router, but haven't seen an option to block an internet ip address.