config['base_url'] for access from public & private network

[eluser]vclef[/eluser]
Hi,

I have an CI-based app that runs on a private IP space (192.168.*.*). This app can also be accessed from the internet (via a hole in the firewall).

My question is: What is the best way to set the config['base_url'] for this app? If I set it to the private IP, obviously it can't be accessed from the internet. If I set it to a public IP, the internal PCs would have to go outside the firewall then come back in. What do you recommend?

Thanks.