1. I setup an account with dynDNS. It is free up to 5 domain names (if I remember correctly).This account allows me to use a software to update a domain name with my new IP address when my ISP changes it. From the internet I can just connect to my router using example.dyndns.org.Most routers supports dynDNS (and some others as well) natively.
2. I enabled the SSH Deamon
   (Administration / Admin access)Enabled at Startup: checked
   Remote Access: checked
   Remote Port: [your choice]
   Allow Password Login: checked
3. When I want to connect to my computers, I use a SSH client software (PuTTY) to connect to my router.PuTTY allows me to configure SSH Tunnels so I can redirect a local port to a remote machine on my LAN without opening any additionnal ports.

Then when you logon to your router using SSH (from the LAN or the Internet), you can issue this command “sh wakeup-mycomputer.sh” and you’re done.

You wait a little bit (until your computer responds to ping) and use the steps of the previous feature to connect remotely…

How to achieve this:

1. In the Initialization script of the firmware (Administration / Scripts / Init tab), type this:
   echo "/usr/bin/ether-wake 01:23:45:67:89:AB" > /tmp/home/root/wakeup-mycomputer.sh
   (change 01:23:45:67:89:AB to the mac address of the computer you want to wake-up)
2. Save and reboot the router, you should see the file “wakeup-mycomputer.sh” appear in the root home directory when you connect using SSH.
3. Try it “sh wakeup-mycomputer.sh”

Note: for the wake-on-lan to work, the computer must have been turn off (soft off). After a power outage or a hard off (unplug, press power off for 5 seconds) the wake-on-lan may not work. Just turn on the computer manually and perform a shutdown.

Note2: I found out that some Linux distribution does not “soft off”. With Ubuntu 8.04, for example, I needed to add a command in the shutdown script… can’t remember. Just post a comment if you want me to digg it again…

When I am connected from the Internet, my domain “example.dyndns.org” resolve to my router public address which forward the port to the right LAN machine.When I am on the LAN, I want to be able to connect using “example.dyndns.org”. But if this domaine resolve to the public address of the router while you are already in the LAN, it does not work. To correct the problem, you could use a host file on your LAN computers, but when you have a laptop that is sometimes on the LAN, sometimes on an external network, you would need to enable/disable your host file every time…The way I succeed to anwer my need, is by providing a host file to the router. I found 2 ways with the Tomato firmware:

First way is explained here on Tomato FAQ.  Unfortunately, I needed to provide multiple host names (domain name) to the same IP address, you can do it by separating them with a space, but Tomate host name field is not wide enough for me.

So my solution goes like this:

1. Create a host file with my ip / host bindings at router boot time (before firewall is started).
   In “Administration / Scripts” menu item, on “Init” tab, place the following lines (use your IP addresses and domain names):
   echo "192.168.1.xxx  example.dyndns.org" > /tmp/hosts.local
echo "192.168.1.yyy  example2.dyndns.org" >> /tmp/hosts.local
2. Configure the firewall (dnsmasq) to use this additional host file.
   In “Advanced / DHCP/DNS” menu item, in custom configuration, place this to enable your custom host file:
   addn-hosts=/tmp/hosts.local
3. Save and reboot the router.
4. Test by doing a ping of you domain names (ping example.dyndns.org).
   The result should be your configured local IP addresss, not the router’s public IP address.