Re: newbie question on port forwarding(and ssh, netcat)

2012/10/11 houkensjtu <houkensjtu@gmail.com>

Thanks Joe, Brian, Murphy

As I post above, I forgot to say all these experiments were done in my home on my laptop...
Now I am in my office and re-do all this experiment.
To be short, now all experiment which is done with ip address works well, while if I do ssh USER@DEBIAN, it will say:

ssh: Could not resolve hostname debian: Name or service not known

I am wondering, who(or what device,server) will resolve the hostname? Is it possible to resolve my laptop's name from my office??

2012年10月11日木曜日 1時00分03秒 UTC+9 houkensjtu:

> Hi debianer!
>
> I am a newbie both of debian and networking...
>
> Recently I am trying to connect my home laptop(I have a router in my home) from office. I read several articles on port forwarding. And I succeeded in opening an 22 port on my router, also I started ssh server on my home laptop.
>
>
>
> (suppose my username at home is USER, and my laptop is called DEBIAN)
>
>
>
> I did several experiment and I got confusing in some of its result.
>
>
>
> 1. ssh USER@DEBIAN
>
>
>
> works well!!
>
>
>
> 2. nc -vz my_home_external_ip 22
>
> [my_home_external_ip] 22 (ssh) : Connection refused
>
>
>
> I cant understand why is it. Because I have actually succeeded in test 1!
>
>
>
> 3. ssh -l USER my_home_external_ip
>
> ssh: connect to host my_home_external_ip port 22: Connection refused
>
> This also doesnt work! I thought it should be equivalent to test 1, but things just dont work.
>
>
>
> Any one can explain this?
>
>
>
>
>
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>
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