On Fri, 12 Sep 2008 00:50:24 +0200
"Zhengguo Xu" <tworiversfolk@gmail.com> wrote:

> my problem is:
> i can connect from desktop to laptop but not reversely. in another word,
> desktop to laptop, ok. laptop to desktop, no connection.
>
[snip]

> 11. "sudo iptables -L" on desktop:
>
[snipped copious iptables -L output from desktop ;-) ]

i haven't looked carefully at all those iptables rules, but I suspect
this might be where the problem lies.

What happens if you run the following commands in order, on the desktop?

sudo iptables -P INPUT ACCEPT
sudo iptables -P OUTPUT ACCEPT
sudo iptables -P FORWARD ACCEPT

sudo iptables -F # Comment (flushes all existing iptables chains)

This should give you a totally "open" firewall on the desktop, and thus
you should be able to reach sshd from the laptop. After those commands
the output from "sudo iptables -L" on both laptop and desktop should
look like the output below from your laptop.

> however, on laptop the same command has output:
>
> Chain INPUT (policy ACCEPT)
> target prot opt source destination
>
> Chain FORWARD (policy ACCEPT)
> target prot opt source destination
>
> Chain OUTPUT (policy ACCEPT)
> target prot opt source destination
>
>
> it seems empty. is it normal?

"Normal" in the sense that this is the output expected when no
iptables / firewall rules are in operation, yes.

I suspect that running the commands I listed above will enable you to
connect from laptop to desktop. If so, then the firewall/iptables
configuration on your desktop is at fault. It's worth a try anyway

You can always restore your firewall / iptables settings, if this does
not succeed.

Peter

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Thanks peter.
The probelm has been solved a couple of days ago.
the thing is i posted this several days ago when i had no idea what was wrong and the mail was too long so it has been held by some inspector/moderator of this mailing list.


thanks for your help anyway. :-)

zhengguo

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On Mon, 15 Sep 2008 18:00:46 +0200
"Zhengguo Xu" <tworiversfolk@gmail.com> wrote:

> The probelm has been solved a couple of days ago.
> the thing is i posted this several days ago when i had no idea what was
> wrong

Heheh - yes I noticed that *after* sending my post. I wasn't paying
attention...

I'm glad that you solved the problem, anyway.

Peter
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