I have a simple adsl router and gateway on the configuration i can allow to forward port 22 to a specific machine. But when i try to connect by ssh the machine from outside i have this answer : ssh: connect to host toto.homeip.net port 22: Connection refused. I disable the firewall to make some tries but the same. Is there a special configuration for ssh to allow this ?
Eric
You have (at least) two separate problems. One is that your address at toto.homeip.net is not a valid public address. Did you set this manually at dyndns.org? If so, you should find out your public IP, e.g. by visiting http://www.whatismyip.com/ from a PC on your LAN, log into dyndns.org, and set the correct address. If you are using dynamic DNS client software, it is not working properly. Your public address is not 192.168.x.x or 10.x.x.x .
Be aware that most NAT routers don't work correctly when you try to connect to their public address from their own LAN. So "ssh toto.homeip.net" from your own LAN is not a valid test, even after you have fixed the name to refer to the correct address. Instead, if you can log into an account on a remote machine, try testing ssh from there. Or, have a friend test for you, or use a dialup account from another PC.
I suspect that you might have two NAT boxes in cascade. Are your router and ADSL modem separate boxes? What is the make and model of each? Who is your ISP? Are you in 'zone dégroupée'? If you go into the web interface of your router, can you find the WAN address? Is it 10.0.0.2 or similar? If so, your ADSL modem could be doing NAT, too! In that case, you will have to configure port forwarding on it also.
The other possibility is that your modem is connected by PPTP or PPPoE. If you need a user name and password to connect to the Internet, this is probably the case, and 10.0.0.2 is just used as an address for linking to the modem. The old Alcatel modems supplied by Wanadoo were like that (they had IP 10.0.0.138) . In this situation, you will see the real (public) IP address in your router status.
Good luck,
Stewart
