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From: Vwaju on 28 Jul 2008 12:12
I have 2 hosts:

jupiter.obliqueuniverse.org
ganymede.obliqueuniverse.org

jupiter is running Debian 4.0 r3 _Etch_
ganymede is running Slackware 12.0

I have a static IP address (207.237.37.110) allocated by RCN. RCN has
admitted to me, under duress, that the static IP address is "not truly
static". I have not sorted out what this means, but I haven't been
able yet to configure my either host for the (nominally) static IP
address, so I have configured both with DHCP. In this circumstance,
they can both reach the internet (ping, ftp, http). They are both
connected by Ethernet cable to the LAN ports on the back of my Dell
Truemobile 2300 Wireless Router.

I want to log into jupiter from ganymede. (jupiter is up and running
sshd.)

I execute the following, with the output shown:

root(a)ganymede:/# ssh admin(a)jupiter.obliqueuniverse.org
ssh: jupiter.obliqueuniverse.org: Name or service not known

root(a)ganymede:/# jupiter.obliqueuniverse.org
ssh: jupiter.obliqueuniverse.org: Name or service not known

root(a)ganymede:/# 207.237.37.110
ssh: connect to host 207.237.37.110 port 22: connection refused

Can anyone tell me why I am not able to login in to jupiter from
ganyemede?
From: Douglas Mayne on 28 Jul 2008 12:35
On Mon, 28 Jul 2008 09:12:58 -0700, Vwaju wrote:

> I have 2 hosts:
>
> jupiter.obliqueuniverse.org
> ganymede.obliqueuniverse.org
>
> jupiter is running Debian 4.0 r3 _Etch_
> ganymede is running Slackware 12.0
>
> I have a static IP address (207.237.37.110) allocated by RCN. RCN has
> admitted to me, under duress, that the static IP address is "not truly
> static". I have not sorted out what this means, but I haven't been
> able yet to configure my either host for the (nominally) static IP
> address, so I have configured both with DHCP. In this circumstance,
> they can both reach the internet (ping, ftp, http). They are both
> connected by Ethernet cable to the LAN ports on the back of my Dell
> Truemobile 2300 Wireless Router.
>
> I want to log into jupiter from ganymede. (jupiter is up and running
> sshd.)
>
> I execute the following, with the output shown:
>
> root(a)ganymede:/# ssh admin(a)jupiter.obliqueuniverse.org
> ssh: jupiter.obliqueuniverse.org: Name or service not known
>
> root(a)ganymede:/# jupiter.obliqueuniverse.org
> ssh: jupiter.obliqueuniverse.org: Name or service not known
>
> root(a)ganymede:/# 207.237.37.110
> ssh: connect to host 207.237.37.110 port 22: connection refused
>
> Can anyone tell me why I am not able to login in to jupiter from
> ganyemede?
>
You have to be careful here, especially if using addresses in the public
IP range. You can have names that aren't registered with the DNS
authority, especially if you're using a private range (10.0.0.0/8,
192.168.0.0/24, etc.) Your private network can then be firewalled from the
internet as a whole with a defined gateway, etc. You can run a local DNS
which provides over-rides into your local range. Again, caution is the
word whenever you are working in the public IP space.

--
Douglas Mayne

From: Tim on 28 Jul 2008 13:47

"Vwaju" <lou(a)manhattanhandyman.com> wrote in message
news:c09989a6-58f5-449b-8165-ffea686cfc7e(a)z66g2000hsc.googlegroups.com...
>I have 2 hosts:
>
> jupiter.obliqueuniverse.org
> ganymede.obliqueuniverse.org
>
> jupiter is running Debian 4.0 r3 _Etch_
> ganymede is running Slackware 12.0
>
> I have a static IP address (207.237.37.110) allocated by RCN. RCN has
> admitted to me, under duress, that the static IP address is "not truly
> static". I have not sorted out what this means, but I haven't been
> able yet to configure my either host for the (nominally) static IP
> address, so I have configured both with DHCP. In this circumstance,
> they can both reach the internet (ping, ftp, http). They are both
> connected by Ethernet cable to the LAN ports on the back of my Dell
> Truemobile 2300 Wireless Router.
>
> I want to log into jupiter from ganymede. (jupiter is up and running
> sshd.)
>
> I execute the following, with the output shown:
>
> root(a)ganymede:/# ssh admin(a)jupiter.obliqueuniverse.org
> ssh: jupiter.obliqueuniverse.org: Name or service not known
>
> root(a)ganymede:/# jupiter.obliqueuniverse.org
> ssh: jupiter.obliqueuniverse.org: Name or service not known
>
> root(a)ganymede:/# 207.237.37.110
> ssh: connect to host 207.237.37.110 port 22: connection refused
>
> Can anyone tell me why I am not able to login in to jupiter from
> ganyemede?

Since you got online with DHCP, your IP addresses may not be what you expect
them to be.

What does ifconfig report on these hosts?

Tim


From: Vwaju on 28 Jul 2008 16:32
On Jul 28, 1:47 pm, "Tim" <tjsn...(a)cometonovascotia.ca> wrote:
> "Vwaju" <l...(a)manhattanhandyman.com> wrote in message
>
> news:c09989a6-58f5-449b-8165-ffea686cfc7e(a)z66g2000hsc.googlegroups.com...
>
>
>
> >I have 2 hosts:
>
> > jupiter.obliqueuniverse.org
> > ganymede.obliqueuniverse.org
>
> > jupiter is running Debian 4.0 r3 _Etch_
> > ganymede is running Slackware 12.0
>
> > I have a static IP address (207.237.37.110) allocated by RCN. RCN has
> > admitted to me, under duress, that the static IP address is "not truly
> > static". I have not sorted out what this means, but I haven't been
> > able yet to configure my either host for the (nominally) static IP
> > address, so I have configured both with DHCP. In this circumstance,
> > they can both reach the internet (ping, ftp, http). They are both
> > connected by Ethernet cable to the LAN ports on the back of my Dell
> > Truemobile 2300 Wireless Router.
>
> > I want to log into jupiter from ganymede. (jupiter is up and running
> > sshd.)
>
> > I execute the following, with the output shown:
>
> > root(a)ganymede:/# ssh ad...(a)jupiter.obliqueuniverse.org
> > ssh: jupiter.obliqueuniverse.org: Name or service not known
>
> > root(a)ganymede:/# jupiter.obliqueuniverse.org
> > ssh: jupiter.obliqueuniverse.org: Name or service not known
>
> > root(a)ganymede:/# 207.237.37.110
> > ssh: connect to host 207.237.37.110 port 22: connection refused
>
> > Can anyone tell me why I am not able to login in to jupiter from
> > ganyemede?
>
> Since you got online with DHCP, your IP addresses may not be what you expect
> them to be.
>
> What does ifconfig report on these hosts?
>
> Tim

Yes, your're quite right, if config reports 192.168.2.4 on jupiter and
192.168.2.3 on ganymede. Using these parameters, I can ssh from
ganymede to jupiter.

Thanks for the help!

Vwaju
New York City
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