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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