If you don't care too much about compatibility, then passive is a good option. It will work with anyone who either doesn't have a firewall/router or who can forward ports in anything they do have. If anyone you need to talk to or send things to can do that, then you can completely avoid forwarding ports in your firewall.

Otherwise, just make sure someone inside the company is initiating the dcc send or chat and that their port range matches your firewall port range. Make sure they don't have passive on. And make sure their port range is set to include chat and send. As long as all of that is done, it should work if the port range is forwarded correctly.


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