Isn't it the other way around?
Jason says that Hub doesn't trust the  Spoke certificate. For me it means that 
Hub already has the identity certificate. Of course we don't the content of 
certificate store from the Hub and can't be 100 sure. But the similar scenario 
worked for me.

Eugene

From: [email protected] 
[mailto:[email protected]] On Behalf Of Kingsley Charles
Sent: Wednesday, August 22, 2012 11:50 PM
To: Jason Madsen
Cc: [email protected]
Subject: Re: [OSL | CCIE_Security] IPSec VPN w RSA-SIG Using Cert Authority 
(CA) as one of the VPN Peers

On the DMVPN Hub, configure separate trustpoint and enroll to itself.


With regards
Kings
CCNA,CCSP,CCNP,CCIP,CCIE 35914 (Security)
On Thu, Aug 23, 2012 at 11:32 AM, Jason Madsen 
<[email protected]<mailto:[email protected]>> wrote:
Hi all,

I was practicing going through some random IPSec VPN configurations to work on 
configuration speed, and I ran into something unexpected.  I setup DMVPN with 
just 2 devices participating...a single hub and spoke.

The unusual part is that I used the DMVPN hub as the Cert Authority (CA) for 
the DMVPN Spoke.  I busted through the config's for DMVPN, and then found that 
ISAKMP kept failing to negotiate using certificates.  I changed to "auth 
pre-shared" and everything came up immediately, so I knew it was cert related.

After reverting back to RSA-SIG auth mode, I found that the Hub kept stating 
that the Cert from the Spoke was "bad".

Is this an unsupported configuration (using a DMVPN hub as a CA for the 
Spokes), is it a supported config' that requires a unique configuration, or did 
I just fat finger something?

I just redid the scenario using a non-DMVPN member as the CA, and everything 
worked immediately...no issues.

Thanks,
Jason

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