DD-WRT SSHD

The default access is using root/password (a really bad idea)

1. Log into the DD-WRT administration panel
2. Go to Services, Services. Find the Secure Shell (SSH) section
3. Enable SSHd, SSH TCP Forwarding. Disable password login.
4. Leave the port at 22, change the port externally via your router virtual server or port forwarding function.
5. The DD-WRT team recommends port 443 because most firewalls leave that open - handy when at work or travelling.
6. Add your keys with this format: ssh-rsa AAA...== yourcomment, each on separate lines (but no LF after the last)

You should be good to go - test internally first, then forward the port and try it outside your firewall.