rafaelweingartner commented on issue #2514: Problem with NAT configuration and 
VMs not accessing each other via public IPs
URL: https://github.com/apache/cloudstack/pull/2514#issuecomment-376837801
 
 
   To tell you the truth, I do not understand how you solve this in the routing 
table. I was your PR, and it is merged in 4.9.3.0, 4.11, and master, and still 
the problem persists.
   
   I am solving in the `iptables`, making it consistent with other 
configurations that we already have for different scenarios. This (like the one 
I am introducing here) solution was already used when we "attach"/direct link a 
public IP to a VM. Check `configure.py` at lines 816-836.
   
   The packet is coming from ETH2 (internal interface) to one of our public 
IPs, we need to execute NAT as well from packets from ETH2 if we want VMs 
accessing each other via their public IPs.

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