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Corporate VPN service with separate nets for different users/groups

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Special Forums IP Networking Corporate VPN service with separate nets for different users/groups
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Old 11-17-2009
Corporate VPN service with separate nets for different users/groups
Hi

We are going to host some services for customers with separate private networks for each customer. Each customer will need one or more users.

I have to put up a VPN solution, and I would like to use something that will work on "any" platform, easily, without too much installation/configuration. I feel PPTP is a good option since the "agent" is included on most platforms. We have a firewall/router on a Debian Linux server, and I'd like to extend it's services to include the VPN service. It has access to all nets, so it should be easier to get that to work.

My firewall/router has four interfaces, but only three of concern. eth0 is the outside, eth1 is the inside and eth2 is DMZ. I use proxyarp to get traffic from eth0 to eth2, with iptables filtering. eth1 has three internal nets in the 192.168.* series. The new nets I want to use for customers will be separate VLAN's on that interface with 10.20.x.* addresses. The firewall/router will of course have an IP in each of these (typically .1).

The big question is how to set this up? Can pptpd be used? Should this be done on a separate server?
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LEARN ABOUT DEBIAN

l2tpipsecvpn

L2tpIPsecVpn(1) 					      General Commands Manual						   L2tpIPsecVpn(1)

NAME

       L2tpIPsecVpn - L2tp over IPsec VPN Manager applet for the GNOME Desktop

SYNOPSIS

       L2tpIPsecVpn [options]

DESCRIPTION

       This  GUI is not a network manager plugin. However, it provides a systray icon in the indicator applet from which a non privileged user can
       establish and bring down L2TP over IPsec VPN connections.

       From there the user can add, remove and edit vpn connections.

       Editing allows configuring various options for IPsec, L2TP and PPP.

       Among others, the user can configure eg. the gateway, the use of either PSK or a certificate for authentication, various  L2TP  options	as
       redial-	timeout and attempts and of course all important PPP options. It also allows you to configure PPP for tunnel splitting because you
       can add routes as you want.

       When applying your settings, all necessary configuration files are written accordingly (ipsec.conf, xl2tp.conf, options.xl2tpd, opensc.conf
       up and down scripts ...).

       It relies on Openswan and xl2tp packages as the underlying protocol handlers.

       You  can  also  use  certificates  on your local machine or, if e.g. OpenSC is installed and configured, even on a smart card to handle PPP
       authentication.

       The GUI automatically detects when network interfaces are going up or down and can (if so configured) automatically establish or close  VPN
       connections.

OPTIONS

       startConnectionEditor
	      Starts the connection editor dialog.

       applySettings
	      Write  configuration  files  according  to  the connection settings, must be started with root privileges, ie use gksudo as non root
	      user.

       deleteAllConfFiles
	      Delete all configuration files, must be started with root privileges, ie use gksudo as non root user.

AUTHORS

       Werner Jaeger

version 1.0.9							    11 Oct 2012 						   L2tpIPsecVpn(1)