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Srinivas, you can also look at the following blog which explains how to 
debug networking issues.
Its a bit old one referring to quantum, but explains the concepts well.
http://techbackground.blogspot.in/2013/05/debugging-quantum-dhcp-and-open-vswitch.html

Regards,
--Sridhar.

On 09/15/2014 09:26 PM, Jay Pipes wrote:
> On 09/15/2014 07:04 AM, Srinivasreddy R wrote:
>> hi,
>> i have launched two instances using icehouse istall guide for 3 node 
>> setup .
>> both instances are accessible  to each other .
>> but not able to access from host compute node ..
>> how can i proceed further ..
>> i have attached ifconfig of my compute host and my instance ip s are
>> 192.168.1.12, 192.168.1.14
>
> Please pastebin your iptables output. I suspect the above is actually 
> the correct and desired behaviour. IIRC, by default, you are not be 
> able to connect to a VM's private IPs from the compute node itself due 
> to security group rules manifested as iptables rules on the compute 
> node, but you *can* from the network node (i.e. the node that is 
> running the neutron L3 agent) via the network namespace associated 
> with the instance.
>
> Best,
> -jay
>
>
>
>
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