[c-nsp] IOS/ASA VPN interop question

[Tom Devries]

Good stuff Gert, I wasn't aware the VTI would use a null proxy id.  I
will have to give it a try.  Thanks!


-----Original Message-----
From: Gert Doering [mailto:gert at greenie.muc.de] 
Sent: October-27-10 3:20 PM
To: Tom Devries
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] IOS/ASA VPN interop question

Hi,

On Wed, Oct 27, 2010 at 11:40:33AM -0400, Tom Devries wrote:
> Reason I ask is in J series SRX "route-based" vpn the proxy ID's for
> local/remote/service will be zero'd by default, and also when there
are
> multiple networks behind the SRX that need encryption.

Traditional IOS "crypto map" approach is that you get proxy IDs = Ph2
SAs
for every line in the match access list.  So "0.0.0.0/0" is only
achievable
with the trick mentioned (deny the rest, then permit 0.0.0.0 - which is
indeed a nice trick, never thought of that myself :) ).

On more recent IOS devices, you can use a crypto tunnel interface:

interface tunnel 10
  tunnel mode ipsec ipv4
  tunnel protection ipsec profile FOO

and from what I can read between the lines in the documentation, it
will then negotiate a 0.0.0.0 proxy ID:

http://www.cisco.com/en/US/technologies/tk583/tk372/technologies_white_p
aper0900aecd8029d629_ps6635_Products_White_Paper.html

(and then use the tunnel interface as a JunOS firewall would do)

Disclaimer: I have never actually used VTI tunnels.

gert

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Gert Doering - Munich, Germany
gert at greenie.muc.de
fax: +49-89-35655025
gert at net.informatik.tu-muenchen.de
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