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https://issues.apache.org/jira/browse/CLOUDSTACK-10346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16428364#comment-16428364
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ASF GitHub Bot commented on CLOUDSTACK-10346:
---------------------------------------------

rafaelweingartner commented on issue #2514: [CLOUDSTACK-10346] Problem with NAT 
configuration and VMs not accessing each other via public IPs
URL: https://github.com/apache/cloudstack/pull/2514#issuecomment-379263294
 
 
   @ustcweizhou are you ok with the changes introduced here?

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> Problem with NAT configuration and VMs not accessing each other via public IPs
> ------------------------------------------------------------------------------
>
>                 Key: CLOUDSTACK-10346
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-10346
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the 
> default.) 
>            Reporter: Rafael Weingärtner
>            Assignee: Rafael Weingärtner
>            Priority: Major
>
> When users create a VPC, and configure a NAT from a public IP to application 
> in a VM. This VM(applications) are not accessible via public IP for other VMs 
> in the same VPC.
>  
> The problem is in the NAT table. If you take a closer look at rules, you will 
> see something like:
> {code:java}
> -A PREROUTING -d publicIP/32 -i eth1 -p tcp -m tcp --dport 80 -j DNAT 
> --to-destination internalIp:80
> {code}
> The problem is that according to this rule only packets coming via 
> eth1(public interface), will be “redirected” to the internal IP. We need an 
> extra entry to each one of the NAT configurations. For the presented rule, we 
> would need something like:
> {code:java}
> -A PREROUTING -d publicIP/32 -i eth2 -p tcp -m tcp --dport 80 -j DNAT 
> --to-destination internalIp:80
> {code}



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