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Re: [Openvpn-users] Cisco routers and OpenVPN


  • Subject: Re: [Openvpn-users] Cisco routers and OpenVPN
  • From: Patrick Lesslie <patricklesslie@xxxxxxxxxxxx>
  • Date: Thu, 8 Apr 2004 22:31:01 +1000

On Tue, Apr 06, 2004 at 09:13:47AM +0800, Paul Culmsee wrote:
> Cisco has NBAR (network based application recognition) which people use
> to apply policies to certain types of traffic at layer 4 and above. I
> once had NBAR decide that regular HTTP traffic was in fact kazaa2 and it
> accordingly dropped the traffic as per my policy for peer2peer
> protocols. 
>
> It looked and felt like a DDOS attack and when I removed all policy maps
> everything was cool again.. an IOS upgrade did the trick..
 
It certainly sounds like an IOS upgrade would be a good thing to do,
I'm sure ours hasn't had one for ages.  OT, do we need a service
agreement to get an upgrade?

> Perhaps you have the same problem. It may be that Cisco NBAR recognizes
> SSH?
> 
> For what its worth, I run openVPn across a 3725 router with NBAR, CBAC,
> IDS, NAT and IPSEC crypto maps and it works fine..

That's most encouraging.  Thanks Paul,

Patrick Lesslie

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