[NTLUG:Discuss] OpenSSH - Newbie Question

[Terry Henderson]

There are two ways you can switch to static IPs:
1) You could have your DHCP server assign static IPs to the PCs you
wish access via ssh.  (Give the DHCP server a MAC address and
corresponding IP address to assign to that MAC each time it boots.)
Or,
2) You can just [reach outside the DHCP pool range and] set the PCs to
static IPs [that are outside that range].

On 7/5/06, Bobby Sanders <ssanders at ssvzc.com> wrote:
> On Wed, 2006-07-05 at 15:17 -0500, brian at pongonova.net wrote:
> > The other problem you'll discover is that the SSH client tries to
> > reverse-map its connections, and there is a significant delay when
> > connecting if it can't complete the reverse mapping.
>
> This would certainly argue for static addresses.
>
> > I find it amusing that you consider DHCP "elegant and extensible."  I
> > feel the same way about static addresses!
>
> Perhaps I don't understand static addresses, or dynamic either, for that
> matter, well enough.
>
> >   --Brian
> >
> > On Wed, Jul 05, 2006 at 03:40:03PM -0500, Bobby Sanders wrote:
> > > On Wed, 2006-07-05 at 14:23 -0500, brian at pongonova.net wrote:
> > > > Why don't you just assign your internal machines non-routable IP
> > > > addresses?
> > >
> > > No real reason. (I'm only concerned with 2 or 3 Linux boxes and a couple
> > > of Windows machines that connect periodically.)  It just seemed to be
> > > the most elegant and extensible way to go.
> > >
> > > BTW, I installed SAMBA for the windows machines (use this with the Linux
> > > machines, too.  No problem in Samba with accessing the servers using
> > > their names.  Wonder why ssh is so different.
> > >
> > > Thanks,
> > >
> > > Bobby
> > >
> > > >  The you can either set up tinydns if you really want to
> > > > resolve the names, or just add them to your /etc/hosts file.
> > > >
> > > >   --Bri
> > > >
> > > > On Wed, Jul 05, 2006 at 02:59:04PM -0500, Bobby Sanders wrote:
> > > > >
> > > > > On Wed, 2006-07-05 at 14:15 -0500, Bobby Sanders wrote:
> > > > > > I now believe that putting my router as a name server
> > > > > > in /etc/resolv.conf and allowing ssh access to all computers on the
> > > > > > local network managed by the router did the trick.
> > > > >
> > > > > Phooey!  I was wrong.
> > > > >
> > > > > >From compt1
> > > > > $ ssh compt2
> > > > > ssh: compt2: Name or service not known
> > > > >
> > > > > $ ssh <compt2's IP>
> > > > > The authenticity of host '<compt2's IP> (1<compt2's IP>)' can't be
> > > > > established. ... Which, of course is just fine.
> > > > >
> > > > > Any ideas about what I'm doing wrong and/or not doing (right)?  Surely
> > > > > it is possible to to do ssh compt1 from compt2 and be logged on to
> > > > > compt1.  In fact, I do it at my ISP.  Now if I could only figure out
> > > > > _how_ they do it, I would be moderately happy. :)
> > > > >
> > > > > Bobby
> > > > >
> > > > > > Bobby
> > > > > >
> > > > > > On Wed, 2006-07-05 13:55 -0500, Bobby Sanders wrote:
> > > > > > > I don't really know.  :(
> > > > > > >
> > > > > > > Two computers, compt1 and compt2.  On each machine these names is are
> > > > > > > aliases for for 127.0.0.1 in /etc/hosts.
> > > > > > >
> > > > > > > The computers are connected to a LinkSys router which connects to my
> > > > > > > cable modem and assigns dynamically assigns IPs to the computers when
> > > > > > > they connect to the router.
> > > > > > >
> > > > > > > In view of your comments on ssh using host resolver code to find the IP
> > > > > > > of a machine, I put the IP of my router as the 1st line
> > > > > > > in /etc/resolv.conf.  Still no luck.
> > > > > > >
> > > > > > > Bobby
> > > > > > >
> > > > > > > On Wed, 2006-07-05 at 12:27 -0500, Wayne Walker wrote:
> > > > > > > > Are you using something like dyndns.org to handle these machine-name->
> > > > > > > > randomly-assigned-ips?  ssh uses the system host resolver code to find
> > > > > > > > the IP for the machine to connect to.
> > > > > > > >
> > > > > > > > On Wed, Jul 05, 2006 at 12:04:18PM -0500, Bobby Sanders wrote:
> > > > > > > > > I'm making my 1st run at using OpenSSH.  I have a router assigning IP
> > > > > > > > > addresses to the various machines.  When I do:
> > > > > > > > >
> > > > > > > > > ssh <remote machine name>
> > > > > > > > >
> > > > > > > > > I get "ssh: <remote machine name>: Name or service not known"
> > > > > > > > >
> > > > > > > > > When I do:
> > > > > > > > >
> > > > > > > > > ssh <remote machine's current IP>
> > > > > > > > >
> > > > > > > > > the first time, I get the expected message to authenticate, etc.
> > > > > > > > >
> > > > > > > > > Can I use dynamically assigned IPs with OpenSSH and, if so, how.
> > > > > > > > >
> > > > > > > > > Thanks in advance.
> > > > > > > > >
> > > > > > > > > Bobby Sanders
> > > > > > > > >
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