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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CLOUDSTACK-10346) Problem with NAT configuration and VMs not accessing each other via public IPs
Date Fri, 05 Oct 2018 00:31:00 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-10346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16639093#comment-16639093
] 

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

rhtyd edited a comment 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-427210903
 
 
   @izenk The basic tests of ingress/egress to/from user VMs to other user VMs using public
SNAT (attached) IP pass for me both when VMs were in (a) different tiers in the same VPC,
(b) across VPCs, (c) in the same tier. Packet marking in 4.11.2.0 is slightly changed to fix
a bug where marking a packet with 0x0 failed in the new VR. Routing etc LGTM, I tested the
latest 4.11 branch (4.11.2.0 rc2 + two new commits not related to VR).

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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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