Hi Masoom, 

You are specifying an IP address. 
0.0.0.0/0 means 'Any IP address' 

Hope that helps

Sent from my iPhone

> On Jun 23, 2014, at 11:41 PM, masoom alam <masoom.a...@gmail.com> wrote:
> 
> Hi every one. 
> 
> Most of the Howtos on DMVPN configuration through OpenNHRP configure the 
> ipsec.conf as follows:
> 
> spdflush;
> 
> spdadd 0.0.0.0/0 0.0.0.0/0 gre -P out ipsec esp/transport//require;
> 
> spdadd 0.0.0.0/0 0.0.0.0/0 gre -P in  ipsec esp/transport//require;
> 
> 
> My question is that if we are not specifying any specific ip address here for 
> HUB <--> Spoke1 and similarly HUB <----> Spoke2, what about the dynamic ipsec 
> tunnel that will be made between Spoke1 <---> Spoke2 on demand. I am uisng 
> preshared secrets for tunnel formation. If Spoke1 is sharing the same secret 
> with HUB, and similarly Spoke2 is also sharing the same secret, Spoke1 and 
> Spoke2 can also form the tunnel without OpenNHRP or?. I am not understanding 
> how phase 2 or 3 of the DMVPN is achieved with preshared secrets....
> 
> A spoke will specify the following configuration in its opennhrp.conf:
> 
> interface gre1
>       dynamic-map 172.16.0.0/16 hub.example.com
>       shortcut
>       redirect
>       non-caching
> 
> 
> where hub.example.com will resolve to ip address of the hub. 
> 
> What about the HUB opennhrp.conf? If no other HUB exist in the topology, 
> whether the following file is ok?
> 
> interface gre1
>       shortcut
>       redirect
>       non-caching
> 
> 
> Finally, the scripts given on the Alpine linux web site for OpenNHRP are only 
> for alpine linux? , for example if we are testing in a lab environment with 
> three Ubuntu VMs, do we need to run those scripts? because they also involve 
> checking zebra running....
> 
> Thanks
> 
> 
> 
> 
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Turn processes into business applications with Bonita BPM Community Edition
Quickly connect people, data, and systems into organized workflows
Winner of BOSSIE, CODIE, OW2 and Gartner awards
http://p.sf.net/sfu/Bonitasoft
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