Re: ssh problems

It worked beautifully for a week. At a new boot today
the 32bit machine had taken the former IP address of
the 64bit machine, and viceversa.

$ slogin "IP address of the other machine"
reported
port 22: time out, while internet navigation with
Firefox browser was OK.

I recognize while writing that before this failure I
had changed the "Epiphany" browser of Gnome to
"iceweasel = firefox" because Epiphany does not
provide remote control (for the online help from
NWChem); though, that seems to me immaterial.

A system maintainer suggested to change the eth#
connections of the two machines (Desktopp,
Administration, Networking) from DHCP to Static,
attributing one of the two IP internnal addresses (on
the hypothesis that those were internal addresses to
the router). While doing so, I had to accept
SubnetMask 255.255.255.0 (which was originally empty),
otherwise no OK. That ended in "Network unreachable).

Well, I could delete all shh configuration and keys
and do that again, though for how long?

Any suggestion to stabilize the connection?

Thanks
francesco pietra


--- Carlo Segre <segre@xxxxxxx> wrote:


Glad it is working for you now,

ciao

Carlo

On Sat, 10 Mar 2007, Francesco Pietra wrote:

Carlo, Jeff:
Thanks. The two machines recognize one another
through
the internal IPs of the router. Now I can submit
the
computation from the i386 machine to either my
other
machine amd64, internal to the router, or to any
supercomputer center where I have an account along
an
ssh connection. Surprisingly, after an initial
period
where the i386 took any one of the two internal IP
addresses (indipendently which machine was started
first), now the two machines behave as if they had
a
static address (it is dhcp). I have not
investigated
the Zyxel router, it is as if it had a memory or a
register, or he likes me.

Cheers
francesco

--- jeffd <fixedored@xxxxxxxxx> wrote:

hm, so say I have 2 machines A and B. My
desktop
will be A.
on A do:
ssh-keygen -t dsa
it will ask you for a password, you dont have to
put
one in, but it
would be more secure to do so, but for this
example
just hit enter.
then
scp ~/.ssh/id.dsa.pub ~/A.pub.key
ssh B
on B:
mkdir .ssh
cat ~/A.pub.key >> .ssh/authorized_keys
chmod -R 600 ~/.ssh

now check /etc/ssh/sshd_config on B, make sure
you
have:
RSAAuthentication yes
PubkeyAuthentication yes
PermitEmptyPasswords no
ChallengeResponseAuthentication no
PermitRootLogin yes (once you get ssh keys
working
you can change the
yes to without-password, to only allow
connections
with keys)

then /etc/init.d/sshd restart

back on A you should be able to ssh B and not be
asked for a password


~
Jeff


Francesco Pietra wrote:
Hi Jeff:

I must have done something wrong because I
already
tried unsuccessfully what you suggest.

I must say that on the two machines (Athlon
i386,
where the graphical interface in my HOME) and
multi-dual-opteron (where the QM program in my
HOME)
both at the same router and with the need to
have
access to internet from the i386, I am both root
and
user with the same username and passwords. May
be
that
confusing the system?

If I change username with "chfn" what about the
many
env variables?

Thanks
francesco

--- jeffd <fixedored@xxxxxxxxx> wrote:


Francesco Pietra wrote:

Hi All:
Is anyone aware of a friendly openssh
(including
server) that installs on Debian etch and
allows
interactive connections secured by pubkeys?

I installed ssh and openssh-server from
debian.
OK
using password, though I met problems in

configuring

for pubkeys (ssd_config comes with "UsePAM
yes"
"PermitRootLogin yes" #AuthorizedKeysFile %h/
.ssh/authorized_keys" (does %h refer to every

user?).

Tired with trial-and-error I hope to find an
easir
groung elsewhere.

Not anyone is a professional administrator,
though
many of us have to get the OS running. A bit
more
comments of the config file would help.

Thanks

francesco pietra









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I think what you are looking for is :
PubkeyAuthentication yes

then put your public key on the remote machine
in
~/.ssh/authorized_keys . also make sure that
file
is
chmod'd to 600

hth
jeff












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--
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College
Illinois Institute of Technology
Voice: 312.567.3498 Fax: 312.567.3494
segre@xxxxxxx http://www.iit.edu/~segre
segre@xxxxxxxxxx





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