I admit to being technically impaired. I have been trying for two days to set up a slingbox. I use a mac 0S 4 with airport extreme, Have Cablevision Isp with motorola modem. I can watch slingbox around the house but not remotely..Airport is set up.

The problem is remote viewing.

Slingbox tech support says it is because i do not have a static IP and that ISP must provide it. Cablevision says it is not avail and if I switch to RCN they say yes but 15$ per month.. Is this the only way or am I doing something wrong or not understanding this..