How to setup a VirtualP for my ftp server?

[periko]

Hi my friends.

I have been reading about the different setups to make internal FTP servers be reachable from the outside. I have test the easy way but still doesn't work.
My server is a pure-ftp, is working in mode passive. I have enable ports from 50000-52000, it has the option to answer to a specific IP, but here  I don't know how to make this possible if my WAN is dynamic, this is one of my doubts.

Reading some post about ftp setup, the option I want to try is went u create a VirtualIP and NAT 1:1. The only problem for is that I have never work with CARP, is really new thing for me.

1. Created Virtual IP based on CARP
2. Enabled FTP proxy helper on WAN interface
3. Created a 1:1 NAT (tried port forwarding, it works too)
4. Reconfigure /etc/vsftp/vsftpd.conf and enabled passive mode, defined the min and max ports and enabled port range (50000 and 51000)
5. Created a firewall rule

I can build VPN, setup the firewall, portforward but I dont know how setup a VirtualIP for this task.

My wan have is over DSL, them my public IP is dynamic, my lan is running on 192.168.50.0/24 my GW 192.168.50.1, my ftp server is 192.168.50.150.

Could someone help me or show me how to setup a VirtualIP to make my ftp server be reachable from the outside, I want to learn more, but this a little confuse for me.

How to setup VirtualIP?

I  will appreciated this a lot or if have a link where I can learn this will be great.

Thanks for your time my friends.

[periko]

My ftp is working, the active mode was the solution.
  Thanks.