Re: [fw-wiz] Pix VPN endpoint and split-tunnel

From: Jason Ostrom (justiceguy_at_pobox.com)
Date: 10/15/05

  • Next message: Paul Pershing: "Re: [fw-wiz] Pix VPN endpoint and split-tunnel" 
    To: "Hughes, Chris" <Chris.Hughes@thalescomminc.com>
Date: Fri, 14 Oct 2005 19:10:22 -0500

    If you are using PIX OS 7.0, it does allow hairpinning, which is to
    forward the packet back out the same interface it was received. And
    stated another way, yes, it supports non-split tunneling in remote
    access IPSec environments. See here:
    http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_data_sheet0900aecd80225ae1.html

    If you are running PIX OS 6.3.(x), it is a correct statement that you
    can't hairpin. But it can be done in another way. The the only way to
    do this is to have two outside interfaces on the PIX. One Outside
    interface terminates the remote access IPSec clients, and the other is
    for the connection to go out public network. This works, absolutely.
    If the IP subnet provided by the ISP is a /28, you can do a /29 on one
    interface and /29 on the other.

    All the best,
    Jason Ostrom

    Hughes, Chris wrote:

    >That's pretty much what I read. I thought they may have provided a fix
    >by now. As for the workarounds, this is for a business partner network
    >and I've already presented them with the "spend" option and they don't
    >want to.
    >
    >Another reply I got here from Simon expressed the possibility that PIX
    >7.x supports this. (split horizon?)
    >
    >Anybody?
    >
    >- Chris
    >
    >
    >-----Original Message-----
    >From: Paul Melson [mailto:pmelson@gmail.com]
    >Sent: Wednesday, October 12, 2005 10:45 AM
    >To: Hughes, Chris; firewall-wizards@honor.icsalabs.com
    >Subject: RE: [fw-wiz] Pix VPN endpoint and split-tunnel
    >
    >-----Original Message-----
    >Subject: [fw-wiz] Pix VPN endpoint and split-tunnel
    >
    >
    >
    >>I am trying to configure a cisco pix as a vpn endpoint for the cisco
    >>
    >>
    >vpn
    >client and
    >
    >
    >>would like to force the client to use the corporate network for
    >>
    >>
    >internet
    >access. I
    >
    >
    >>don't want to allow split-tunnel. I cant find any info on how to do
    >>
    >>
    >this.
    >Is split
    >
    >
    >>tunnel the only way to give a vpn client internet access once they are
    >>
    >>
    >connected?
    >
    >The short answer is yes. PIX-fu rule #1: the PIX is not a router. It
    >can't
    >take traffic that arrives on one interface and pass it back out that
    >same
    >interface, even when the traffic arrives via VPN tunnel. That said, you
    >can
    >sort of solve this problem by having the clients use a proxy server
    >while
    >connected via full tunnel. There may or may not be an elegant way to
    >automate this for your road warriors, but this would really be
    >independent
    >of anything the PIX or VPN client do. (Think login scripts, Group
    >Policy,
    >etc.)
    >
    >If it's a big enough issue that you're willing to spend time and
    >resources
    >on it, I would recommend looking at the VPN3K concentrators (or ASA
    >5500?).
    >They can do exactly what you're asking for, plus they possess a number
    >of
    >other features for managing VPN client users that the PIX doesn't have.
    >(Like dynamic VPN profile assignment via RADIUS.)
    >
    >PaulM
    >
    >
    >
    >
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