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Re: [vox-tech] Trying to understand my own WAN
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Re: [vox-tech] Trying to understand my own WAN

  • Subject: Re: [vox-tech] Trying to understand my own WAN
  • From: "Jay Strauss" <jjstrauss@yahoo.MAPScom>
  • Date: Mon, 07 May 2001 08:23:11 -0700
  • References: Pine.LNX.4.21.0105061937400.16837-100000@mirimichi.pvusa.localnet

Why not ssh straight to the oracle server?  I don't know, I thought it'd be
safer/easier to have a single point of entry and port redirection, than
having to go different ports based on the machine you want to get to.


----- Original Message -----
From: <jdnewmil@dcn.davis.ca.us>
To: <vox-tech@franz.mother.com>
Cc: "vox-tech" <vox-tech@lugod.org>
Sent: Sunday, May 06, 2001 9:47 PM
Subject: Re: [vox-tech] Trying to understand my own WAN

> On Sun, 6 May 2001, Jay Strauss wrote:
> [...]
>  Trying to do Xterm from the internal LAN:
> >     I figure I have to run an SSH (openSSH) server somewhere inside my
> >     My LRP box will let me SSH to the DMZ - i.e. it will let all
> > packets thru
> but it also has to let inbound packets in for the return trip.
> >     I don't get how I allow X to send its display from the DMZ to the
> > Internal LAN
> >         thru the LRP?  I don't think I portforward, I think I have to
open a
> > hole in the LRP
> >         for SSH connections - Is this right?
> Only an "outbound hole", with ipchains "! -y" option for the return
> packets.
> > Now for the hard part, I want to manage my oracle server from home
> >     I SSH to my ssh server in the DMZ
> >     Then I have to SSH from the SSH server to the oracle server?
> Why not ssh straight to the oracle server? what is the purpose of having
> an "ssh" server? Or, if you need two landing points for ssh connections,
> use multiple ssh server ports on the linksys.... directing them to the
> appropriate ports on your two ssh servers.
> >     Then I start my start xterm and tell it to send the display home?
> >     Once the packet get home, How do my commands make it back to the
> > server?  The Linksys will portforward SSH to
> >         the SSH server not the oracle Server.
> >     How are my packets even going to make it home - won't my firewall
> > LRP box at home going to block them?
> Only if you configure them to.  Ordinarily, you would setup outbound rules
> to go to your ssh server such that return packets would be allowed back to
> client ports if and only if the tcp flags are set right.  Not perfect
> security, but usable.
> --------------------------------------------------------------------------
> Jeff Newmiller                        The     .....       .....  Go
> DCN:<jdnewmil@dcn.davis.ca.us>        Basics: ##.#.       ##.#.  Live
> Work:<JeffN@endecon.com>              Live:   OO#.. Dead: OO#..  Playing
> Research Engineer (Solar/Batteries            O.O#.       #.O#.  with
> /Software/Embedded Controllers)               .OO#.       .OO#.
> --------------------------------------------------------------------------

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