Accessing home mac fromwork through a router and cable modem

Hi - i'm really struggling with this - spent hours looking around net finding out how to set this up and as far as i can tell i've got it all set right - however it refuses to work.
I want to be able to access files on my home mac from work. Various ways of doing this i have read is SSH (or SFTP - Remote login) FTP Access or personal file sharing - tried them all can't get any to work so problem somewhere.
Have an NTL cable modem wired to a Netgear RP614 router which has Ip address A.A.A.A on its WAN port. It has B.B.B.1 on its LAN port. I have an airport base station acting only as a wireless access point (ie DHCP is turned off) router is allocating IP addresses - my ibook has B.B.B.3 - but have reserved this address for my iBook, ie it is as good as fixed as the router always gives my iBook this IP (using MAC address). Have port forwarded all necessary ports on the router, 22, 20, 21, 548 to B.B.B.3. Apple firewall is switched off - what am i doing wrong? I have also set the router to link to a DynDNS service to update its WAN IP everytime to my domain name i have set up.
If i try to FTP with transmit or fetch it doesnt work, if i try SFTP with fetch or transmit it doesn't work, and filesharing via connect to server doesn't work.
What am i dong wrong? How come everyone else can get this working but i can't?
cheers!!!

Right i tried my iBook connected directly to the cable modem and everything works then! Although one thing i did notice is that in the sharing windows in preferences at the bottom where it tells you how to connect to that particular service it didn't report the Ip address it reported a name - something like bcu-cu-cust36-bag-ntl.com - however when i looked this up it did resolve as the IP address reported by my network preferences.
So i'm not quite sure whats going wrong here - i'm gogin to try taking my airport base station out of the equation and hard wire my laptop to the router and see what joy there....

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