You can use any of your domains - no need to actually use the IP address of your server, though you can use any of the IP addresses assigned to your domains as well (ignore this if you find it confusing, I only include it for pendantic completeness).
SSH usually always runs on port 22. DH certainly does this on their servers.
What are [color=#CC0000]50DISK50[/color], [color=#CC0000]3DOM50[/color], and [color=#CC0000]1IP1DOM50[/color]?
They're Dreamhost coupons!