[ale] Routing Questions

Chris Fowler cfowler at outpostsentinel.com
Fri Nov 30 23:14:47 EST 2001

So,  see if I understand this right.

Becasue I have chosen to use private IP's on each eand, those packets by
definition are not routeable.
If they were public then it should have worked?

I wanted to get basic routing doen then move to tunnel and encryption.  I
guess I'll  skip the test of pinging machines on both sides and begin
working directly on a tunnel.

Technically why can I not tell the kernel to send all pakets for
to skylab and tell sky lab the reverse to send back to Mir?  Is it a
technical limitation or the fact the IPs are private?

Chris Fowler

-----Original Message-----
From: Byron A Jeff [mailto:byron at cc.gatech.edu]
To: ale at ale.org
Sent: Friday, November 30, 2001 6:05 PM
To: cfowler at outpostsentinel.com
Subject: Re: [ale] Routing Questions

> I have 2 networks now.  One in Buford and One in Alpharetta.
> Alpharetta:
> Buford:
> Both networks are connected to the internet using telocity.  I want to be
> able to route packets between both of the private nets.  Is this possible
> since these
> are 192.168.*.

Not directly.

> [Table deleted for brevity]
> When I issue this command in Alpharetta:
> [root at skylab /etc]# route add -net netmask gw eth1
> SIOCADDRT: Network is unreachable
> Buford:
> [root at mir /etc]# /sbin/route add -net netmask gw
skylab metric 1 eth1
> SIOCADDRT: Network is unreachable

You'll need to tunnel packets between your two gateways. You first set up a
pipe between your two gateways (and ssh one for example). Then setup a PPP
session between them using the ssh pipe. Then direct your packets for the
opposite network to the ppp interface.

This is a simplistic mechanism for building a VPN, which is essentially what
you need in this instance.

A 5 second perusal of linuxdocs.org pointed me to the Firewall-Piercing
This applies because the naming of your networks with private IP's
firewalls them.

Anyway read the HOWTO's in this section:


and they will guide you into building a tunnel between your networks.


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