ASF GitHub Bot commented on CLOUDSTACK-10317:

rhtyd 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_r172520624

 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" % 
+                            "-A POSTROUTING -o %s -j SNAT --to-source %s" % 
(self.dev, self.address['public_ip'])])
 Review comment:
   Thanks for confirming that we indeed need to set the device/interface in the 
rule @ustcweizhou. I think it makes sense to have the default packets routed to 
the default public snat ip. I'll let others comment on it.

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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:,
> 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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