As dynamic IP within a period is fixed, I can use google to find my two dynamic IPs ( two offices) and start networking such as ftp, ssh and etc.
But I do not know how to setup the wanos.
For example I have a ftp server on one side as follows,
office1_network --- switch --- wanos --- isp_router1 --- WAN --- isp_router2 ---wanos --- switch --- office2_network (including ftp_server, samba_server, and other servers, and each server with a dedicated computer)
Pls help.