It's the same.

You can find the IPv6 address of your phone with either an ifconfig in the terminal or by going to www.whatismyv6.com. Once you have that address, you can ssh user@xxxxx, where xxxxx is your IPv6 address on the phone.

I am not sure what the default user is on the n900, but i assume you can create a user account with any valid name and password, or use root to SSH into the phone ... i have not done it myself.

Now, for this to work you have to have downloaded and installed the SSH sever and have it running. Same goes for FTP, HTTP, ... or whatever service you want to run on the phone.