What settings are needed in the firewall to allow ftp?

Hi Folks

I've recently brought my operating system up to date (openSUSE 13.1 x86_64) and I'm now having problems with the firewall. I use FileZilla to connect by ftp to my websites but the firewall is preventing the data transfer. It seems to work OK with the firewall off. What settings should I use in the firewall to allow ftp through? My computer is on a LAN and my websites are hosted professionally.

Thanks

Schrod