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Thread View: comp.security.firewalls
5 messages
5 total messages Started by Poster Tue, 05 Feb 2002 19:05
VPN behind not managed Firewall-1: can it be done?
#414
Author: Poster
Date: Tue, 05 Feb 2002 19:05
14 lines
1632 bytes
Hello

I'm an IT guy at a working company which only has an internet
connection through a firewall (FW1) which is managed by another
IT department (holding company) I like to connect our network
through a secured VPN connection (haven't bought any software yet).
 I'm not able to configure the FW1 myself.
I wonder if it's somehow possible to use this internet connection for
a VPN connection without changing the firewall AND without involving the
holding ICT department.  It takes way TOO long waiting for the holding
company to start their own VPN project.

thanks !!!!
Re: VPN behind not managed Firewall-1: can it be done?
#415
Author: Keith W. McCammon
Date: Tue, 05 Feb 2002 19:41
30 lines
2017 bytes
Unless they have some pretty slack policies, there shouldn't be any way to
establish a VPN without involving them.  You have to open ports for
authentication (i.e., 500/UDP for IKE) and encapsulation (esp, gre, etc.),
which requires that they modify their policy.

--
Keith W. McCammon


"Poster" <someone@microsoft.com> wrote in message
news:e2W78.96$mb6.263@pollux.casema.net...
>
> Hello
>
> I'm an IT guy at a working company which only has an internet
> connection through a firewall (FW1) which is managed by another
> IT department (holding company) I like to connect our network
> through a secured VPN connection (haven't bought any software yet).
>  I'm not able to configure the FW1 myself.
> I wonder if it's somehow possible to use this internet connection for
> a VPN connection without changing the firewall AND without involving the
> holding ICT department.  It takes way TOO long waiting for the holding
> company to start their own VPN project.
>
> thanks !!!!
>
>
>
>
>
Re: VPN behind not managed Firewall-1: can it be done?
#416
Author: cghoerichs
Date: Tue, 05 Feb 2002 23:10
24 lines
1821 bytes
Try running a port scan from outside of the FW against a node inside.  If
you can (doubtful) than you can do anything you like.

"Poster" <someone@microsoft.com> wrote in message
news:e2W78.96$mb6.263@pollux.casema.net...
>
> Hello
>
> I'm an IT guy at a working company which only has an internet
> connection through a firewall (FW1) which is managed by another
> IT department (holding company) I like to connect our network
> through a secured VPN connection (haven't bought any software yet).
>  I'm not able to configure the FW1 myself.
> I wonder if it's somehow possible to use this internet connection for
> a VPN connection without changing the firewall AND without involving the
> holding ICT department.  It takes way TOO long waiting for the holding
> company to start their own VPN project.
>
> thanks !!!!
>
>
>
>
>
Re: VPN behind not managed Firewall-1: can it be done?
#417
Author: Keith W. McCammon
Date: Wed, 06 Feb 2002 13:36
9 lines
1652 bytes
> Try running a port scan from outside of the FW against a node inside.  If
> you can (doubtful) than you can do anything you like.

Even if that is possible (which it likely is not), that has nothing to do
with establishing a tunnel from an internal host.  I could set up a rule (w-
Static Dest NAT) that says NOT-INTERNAL -> INTERNAL ANY ALLOW, which would
allow a portscan from an external host to an internal host.  However, that
internal host still can't initiate access to an external network unless I
explicitly add another rule to permit the action.
Re: VPN behind not managed Firewall-1: can it be done?
#418
Author: Lars M. Hansen
Date: Wed, 06 Feb 2002 16:45
25 lines
2213 bytes
On Tue, 05 Feb 2002 19:05:46 GMT, Poster spoketh

>
>Hello
>
>I'm an IT guy at a working company which only has an internet
>connection through a firewall (FW1) which is managed by another
>IT department (holding company) I like to connect our network
>through a secured VPN connection (haven't bought any software yet).
> I'm not able to configure the FW1 myself.
>I wonder if it's somehow possible to use this internet connection for
>a VPN connection without changing the firewall AND without involving the
>holding ICT department.  It takes way TOO long waiting for the holding
>company to start their own VPN project.
>
>thanks !!!!
>

If you have more than one public IP address available, you can set up a
VPN gateway in parallel to the firewall. You'll need a router (or
something) on your LAN to send the VPN traffic to the VPN gateway and
all the other stuff to the FW-1. It's a rather common configuration...
Lars M. Hansen
http://www.hansenonline.net
(replace 'badnews' with 'lars' in e-mail address)
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