[jira] [Commented] (CLOUDSTACK-10346) Problem with NAT configuration and VMs not accessing each other via public IPs

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-10346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16635913#comment-16635913 ] 

ASF GitHub Bot commented on CLOUDSTACK-10346:
---------------------------------------------

rhtyd 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-426374888
 
 
   Let me test that this week @izenk and see if I can reproduce the bug (guest VMs insider same VPC/ same tier unable to access each other via public IP).

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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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