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Re: [Users] Wildcards in left/rightsubnet=, roadwarior behind DHCP enabled DSLrouter.

From: Andreas Steffen (andreas.steffen_at_strongsec.com)
Date: Fri May 31 2002 - 09:26:14 CEST


Hi,

since the Linksys DSL router gets a quasi-static external IP address
assigned by your ISP, why can't you just give your Win2k box a fixed IP
e.g. 192.168.0.1 ? Then you could configure in ipsec.conf

conn rw
        left=%any
        leftsubnet=192.168.0.1
        auto=add

Or does the Linksys DSL router act as a DHCP server for your Win2k box
and you are limited to the possibility to restrict the range of the
dynamic address pool on the Linksys box to e.g. 192.168.1.0/24?
Then with the new version 0.9.12 of the X.509 patch which will be
released most probaly today you will be able to define

conn rw
        left=%any
        leftsubnetwithin=192.168.1.0/24
        auto=add

FreeS/WAN will then accept (of course after successful authentication
on the basis of the peer certificate, only) any peer having an inner IP
address or a subnet contained within the wildcard bracket 192.168.1.0/24.

Regards

Andreas

Dmitriy Bondar wrote:
>
> I have Linksys DSL router at home which does NAT with IPsec passthrough.
> My external IP is different from internal NATed private IP. I need to
> establish a connection between a Win2K computer at home and FreeSWAN
> enabled gateway at work. I can easily put left=%any for my home computer
> but this does not solve the major problem. While my external DSL IP rarely
> changes (if at all), my internal IP is different anytime I turn my
> computer on.
>
> I couldn't find a way to specify in ipsec.conf to accept any subnets from
> a roadwarior. Anyone can help me here?
>
> Thanks,
> Dmitriy

======================================================================
Andreas Steffen e-mail: andreas.steffen_at_strongsec.com
strongSec GmbH phone: +41 76 340 25 56
Alter Zürichweg 20 home: http://www.strongsec.com
CH-8952 Schlieren (Switzerland)
==========================================[strong internet security]==
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