On 08/08/12 10:10, Ed Greshko types:

On 08/08/2012 10:01 PM, Bob Goodwin - Zuni, Virginia, USA wrote:

Replaced F-16/64 with F-17/64 on "box7" and see a problem I seem to
have every time I do this.

Presently box7 will ssh into box9 but box9 can not get into box7,

[root@box9 .ssh]# ssh bobg@192.168.1.7
ssh: connect to host 192.168.1.7 port 22: No route to host
root or user,

[bobg@box9 ~]$ ssh bobg@192.168.1.7
ssh: connect to host 192.168.1.7 port 22: No route to host

sshd is enabled and running on both, I've tried rm'ing "known_hosts"
and letting it regenerate, all to no avail.

I've seen this with several generations of Fedora [and different
equipment] and it's always the same, a few days or weeks later it
magically begins to work! All my computers in this room connect to a
gigabit switch, [even the switch has been replaced], and our
wireless LAN.

At times this is a serious inconvenience leading to typing errors, etc.

Any ideas what I have missed?


Assuming you've ssh'd to yourself on box7 and that works....sounds as if your firewall doesn't have port 22 open.




Ok,the firewall is the problem! I had run "setup" as I have done
many times and saw nothing out of the ordinary, looked the same [but
obviously something was different] so I dropped that idea.

Now I disabled the firewall and immediately got a connection from
box9, re-enabled the firewall, it still connects?

[bobg@box9 ~]$ ssh bobg@192.168.1.7
bobg@192.168.1.7's password:
Last login: Wed Aug 8 10:30:11 2012 from box9


I guess this makes me look even less competent than usual but I did
look at this earlier and saw no reason to suspect the firewall. Will
add that to my Linux notes ...

Thanks to all,

Bob


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box9

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On 08/08/12 10:21, Bill Shirley types:

'No route to host' means the box is not there. Does ping work? Maybe it
moved to a different address.

# nmap -sP 192.168.1.0/24

should find it.

Bill


It was a firewall problem but "nmap" is a command/application I
needed to know about. It should help me to detect new devices that
appear on our LAN. Installed it on both computers. I usually rely on
the [dd-wrt] router dhcp clients list. Have made a note of that.

Thanks,

Bob



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box9

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On 08/08/2012 07:01 AM, Bob Goodwin - Zuni, Virginia, USA issued this
missive::


Replaced F-16/64 with F-17/64 on "box7" and see a problem I seem to
have every time I do this.

Presently box7 will ssh into box9 but box9 can not get into box7,

[root@box9 .ssh]# ssh bobg@192.168.1.7
ssh: connect to host 192.168.1.7 port 22: No route to host
root or user,

[bobg@box9 ~]$ ssh bobg@192.168.1.7
ssh: connect to host 192.168.1.7 port 22: No route to host

sshd is enabled and running on both, I've tried rm'ing "known_hosts"
and letting it regenerate, all to no avail.

I've seen this with several generations of Fedora [and different
equipment] and it's always the same, a few days or weeks later it
magically begins to work! All my computers in this room connect to a
gigabit switch, [even the switch has been replaced], and our
wireless LAN.

At times this is a serious inconvenience leading to typing errors, etc.

Any ideas what I have missed?


"No route to host" is almost certainly a network issue. It means that
box9 has no network route to 192.168.1.7. Make certain that box9 has
its IP address and netmask set properly. If box9 is on a different
network than 192.168.1.7, make sure that the gateway is also set.
"traceroute 192.168.1.7" would also be your friend.
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