R: [Users] VPN with natted vpn server

From: Giorgio Biondi (gbiondi_at_tech2.it)
Date: Sat Nov 23 2002 - 07:11:48 CET


Hi,

you suggest to write a different ipsec.conf for win98 machine, (with
leftsubnet modified) but the software on win98,
don't have nothing to make this...I can modify only ipsec.conf on the
linuxbox side.
Follow my ipsec.conf

#
config setup
        interfaces="ipsec0=eth1"
        klipsdebug=none
        plutodebug=none
        plutoload=%search
        plutostart=%search
        uniqueids=no

conn %default
        keyingtries=0

conn road
        type=tunnel
        keyingtries=1
        left=%any
        rightnexthop=
        right=192.168.252.2
        rightsubnet=10.0.0.0/16
        rightfirewall=yes
        authby=secret
        auto=add
~

-----Messaggio originale-----
Da: Sam Sgro [mailto:sam_at_freeswan.org]
Inviato: venerdì 22 novembre 2002 19.55
A: Giorgio Biondi
Cc: users_at_lists.freeswan.org
Oggetto: Re: [Users] VPN with natted vpn server

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On Fri, 22 Nov 2002, Giorgio Biondi wrote:

> Hi,
>
> I want create access for road-warrior (win98 with dun V1.4 + msl2tp ipsec
from M$),

So, you're also running lt2pd on the FreeS/WAN server, right?

If you get this working, please post to the list - I'm certain there are a
number of people who would be interested in seeing a working example of this
setup.

> but the real problem is my linux vpn concentrator, his have a natted-ip
from Fastweb carrier.

Ah, NAT *and* l2tp; sounds like a fun time. ;)

> The scenarios is this:
>
> 10.0.0.0/16-->10.0.1.2/16[linux]192.168.252.2-->212.121.121.2(public ip)
>
> My road warrior send ipsec packet to 212.121.121.2 but the linux
>
> 'see' packet FOR interface 192.168.252.2 and write on log this:
>
> Nov 21 10:05:52 fw pluto[9324]: "road"[1] 151.28.38.5 #1: cannot respond
to IPsec SA request because no connection is known for
> 212.121.121.2/32===192.168.252.2:17/1701...151.28.38.5:17/1701
    subnet ipsec host roadwarrior

Okay, that's not right.

Your setup sees the reverse request from the MS machine; that
212.121.121.2/32
is the subnet, protected by 192.168.252.2/32. The proper setup will define
the
reseverse; you will need to define the 192.168.252.2/32 as the subnet
machine
in at least one connection allow packets to flow.

This has to be an error on the MS side; perhaps you've misconfigured the
client.

To deal with the NAT issues you will run into, make connections, with
different values of "leftsubnet".

leftsubnet=192.168.252.2/32

and the other, with:

leftsubnet=10.0.0.0/16

Just make certain that all the potential values have been covered.

- --
Sam Sgro
sam_at_freeswan.org

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