On Sat, 2009-09-26 at 15:30 -0400, Erik Hemdal wrote:
>
> > From: Germ?n Racca <german.racca@xxxxxxxxx>
> > Subject: Re: I can't connect via ssh
> > To: "Community assistance, encouragement, and advice for using
> > Fedora." <fedora-list@xxxxxxxxxx>
> > Message-ID: <1253925734.7784.27.camel@xxxxxxxxxxxxxxxxxxxx>
> > Content-Type: text/plain; charset="UTF-8"
> >
> > On Fri, 2009-09-25 at 18:32 -0500, Aaron Konstam wrote:
> >> On Fri, 2009-09-25 at 16:20 -0300, Germán Racca wrote:
> >> > Hi list:
> >> >
> >> > I need to use ssh to transfer data between a PC and a notebook, both
> >> > with Fedora 11, but the result is, from notebook to PC:
> >> >
> >> >
> >> > $ ssh xx.xx.xx.xx
> >> > ssh: connect to host xx.xx.xx.xx port 22: No route to host
>
> It might help to picture what has to happen for an SSH connection to work:
>
> --You have to make a request with the ssh command on the client machine,
> where you are sitting. If you can craft an ssh command, as you did, this is
> probably not your problem.
> --The SSH traffic has to get past the local firewall. By default, this
> isn't usually a problem, because the firewall will allow outbound traffic.
> If you can browse the Web and get email, this is probably OK and is not the
> source of your problem.
> --The SSH traffic has to get through your network. It might be blocked
> because your network administrator forbids SSH or because there's some other
> problem. So we need to investigate this first.
> --The firewall on the remote computer (the one you want to "SSH into") has
> to let the SSH traffic in. This is usually done by telling the firewall to
> "trust SSH" or "open port 22".
> --The remote computer has to have an SSH server running and ready to go.
> This is the "service sshd start" part.
>
> The error "No route to host" means that your SSH packets could not find
> their way to the computer at xx.xx.xx.xx. That might be because the
> firewall on that computer hasn't opened port 22 (common) or because the
> computer can't be reached through the network.
>
> Pinging the computer uses a different kind of message ("ICMP packets") to
> see if the computer can be contacted. But you don't want to ping localhost,
> because that is pinging your local PC. So it will tell you if the network
> interfaces on the two computers are working, but won't tell you if they are
> visible to each other on the network. On my laptop, "ping localhost" works
> even when my network connections are disconnected from everything.
>
> To make sure, you need the IP addresses; any computer at all should respond
> when you call it localhost. Ping from one computer using the IP address of
> the other one.
>
> ping xx.xx.xx.xx
>
> with the actual IP addresses will tell you a lot. If the pings are
> successful, then you know that there is a connection between the two. If
> not, you need help from your network administrators to know if the
> connection is possible.
>
> The ifconfig command will tell you the IP address (inet address) for each
> network interface that is up.
>
> >> >
> >> > $ ping xx.xx.xx.xx
> >> > >From xx.xx.xx.xx icmp_seq=11 Destination Host Unreachable
> >> > >From xx.xx.xx.xx icmp_seq=12 Destination Host Unreachable
> >> > >From xx.xx.xx.xx icmp_seq=13 Destination Host Unreachable
>
> Destination Host Unreachable means that the remote computer can't be found.
> There's no way to get an ICMP packet to reach it.
> >> >
> >> > >From PC to notebook there is no response.
>
> This is what I'd expect if the computer can be found on the network, but it
> is deliberately not responding to pings -- or if something like a firewall
> is in the way and blocking pings. In either case, this looks like a network
> issue. There may be other problems too, but making sure the network is OK
> is first on the list to solve.
>
> Post back if you need more help. I hope this will help you. These kinds of
> problems can be very hard to solve.
>
> Erik
Hi Erik,
Thanks for your clarifying message! Now I discovered the following:
I can ping and connect via ssh from other computer to my notebook, but
*I can't from other computer to my PC*. The messages, from other
computer to my PC are:
$ ssh xx.xx.xx.xx
ssh: connect to host xx.xx.xx.xx port 22: No route to host
$ ping xx.xx.xx.xx
>From xx.xx.xx.xx icmp_seq=11 Destination Host Unreachable
I'm going to contact the network administrator on Monday, but I hope
that you and the other guys that answered to my post can continue to
help me on this issue. Sorry for my bad English ;-)
Germán.
--
Germán A. Racca
National Institute for Space Research (INPE)
São José dos Campos - SP - Brasil
http://gracca.wordpress.com
http://tinyurl.com/SkyTux
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