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From Jayapal Reddy Uradi <>
Subject RE: Problem with VM private IP
Date Mon, 24 Sep 2012 10:52:55 GMT
Using firewall and port forwarding rules only  we can access the VM services from the public
network also from the VMs using the Public IPs.
For you  telnet from outside network success but from failed from VM to VM using public IP.
Seems hair pin NAT  got failed ...

Please capture the packets on the telnet server VM to see whether telnet packets are reaching
or not ?

Which version of cloudstack Is it ?


-----Original Message-----
From: Hieu Le [] 
Sent: Monday, September 24, 2012 3:39 PM
Subject: Problem with VM private IP

Hi everyone,

I have a problem while working with VM private IP. My Cloud system run 2 VMs in advance zone
with private IP is and and VM NAT IP is and
From outside network, I can ping and telnet port 80 to both VMs with public IPs. But from
VM, I can't telnet to other VM with its public IP.

For details:
>From VM1: and
ping and ping success telnet 80 success telnet
80 fail

>From VM2: and
ping and ping success telnet success telnet
80 fail

And I can't telnet another ports with public IP.

Can you suggest some solutions for me to telnet VM from another VM via public IP.

Thank !

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