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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CLOUDSTACK-10317) In case of multiple-public ips, snat fails to work for addtional public nics/network for guest traffic
Date Tue, 06 Mar 2018 14:11:00 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-10317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16387836#comment-16387836
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ASF GitHub Bot commented on CLOUDSTACK-10317:
---------------------------------------------

DagSonsteboSB commented on a change in pull request #2476: CLOUDSTACK-10317: Fix SNAT rules
for additional public nics
URL: https://github.com/apache/cloudstack/pull/2476#discussion_r172526560
 
 

 ##########
 File path: systemvm/debian/opt/cloud/bin/cs/CsAddress.py
 ##########
 @@ -388,7 +388,7 @@ def fw_router(self):
             self.fw.append(["mangle", "",
                             "-A VPN_%s -j RETURN" % self.address['public_ip']])
             self.fw.append(["nat", "",
-                            "-A POSTROUTING -o eth2 -j SNAT --to-source %s" % self.address['public_ip']])
+                            "-A POSTROUTING -o %s -j SNAT --to-source %s" % (self.dev, self.address['public_ip'])])
 
 Review comment:
   Hi @ustcweizhou - in your scenario - does this not mean you end up SNATing on the wrong
interface? So lets say you have eth2/VLAN10/10.100.1.10/24 and eth3/VLAN20/10.100.2.20/24.
With your method that would SNAT to
   
   - A POSTROUTING -o eth3 -j SNAT --to-source 10.100.1.10
   
   So in other words the IP address would be right for the initial source NAT, but it would
end up being translated on the wrong interface?

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> In case of multiple-public ips, snat fails to work for addtional public nics/network
for guest traffic
> ------------------------------------------------------------------------------------------------------
>
>                 Key: CLOUDSTACK-10317
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-10317
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>            Reporter: Rohit Yadav
>            Assignee: Rohit Yadav
>            Priority: Minor
>             Fix For: 4.12.0.0, 4.11.1.0
>
>
> If a VR has two+ public nics, traffic from guest VM fails to be NAT-ed correctly for
traffic towards additional public nics.



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