Re: newbie question on port forwarding(and ssh, netcat)
Brian於 2012年10月11日星期四UTC+9上午8時00分04秒寫道：
> On Wed 10 Oct 2012 at 08:35:13 -0700, houkensjtu wrote:
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> > I am a newbie both of debian and networking... Recently I am trying
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> > to connect my home laptop(I have a router in my home) from office. I
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> > read several articles on port forwarding. And I succeeded in opening
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> > an 22 port on my router, also I started ssh server on my home laptop.
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> >
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> > (suppose my username at home is USER, and my laptop is called DEBIAN)
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> >
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> > I did several experiment and I got confusing in some of its result.
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> >
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> > 1. ssh USER@DEBIAN
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> >
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> > works well!!
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> We assume this means you were able to log in with your password, so it
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> very much looks like you have set up port forwarding to the home machine
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> correctly. Would you please say how your office machine resolves the IP
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> number for DEBIAN.
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> >
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> > 2. nc -vz my_home_external_ip 22
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> > [my_home_external_ip] 22 (ssh) : Connection refused
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> >
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> > I cant understand why is it. Because I have actually succeeded in test
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> > 1!
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> What do get with
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> ssh USER@my_home_external_ip ?
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> > 3. ssh -l USER my_home_external_ip
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> > ssh: connect to host my_home_external_ip port 22: Connection refused
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> > This also doesnt work! I thought it should be equivalent to test 1,
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> > but things just dont work.
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> 'Connection refused' would indicate there is a route to the host but
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> there is no daemon running on port 22.
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> Archive: [🔎] 20121010225534.GJ30872@desktop">http://lists.debian.org/[🔎] 20121010225534.GJ30872@desktop
Thanks for great reply!!
I have to apologize for sth... I forgot to say that all these experiments were done in home on my laptop...omg
So, now I solved the problem with
echo "1">/proc/sys/net/ipv4/ip_forward
What is this file? Is there any other way to check or configure my laptop with out writing directly to this file?
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