weizhouapache commented on PR #9552:
URL: https://github.com/apache/cloudstack/pull/9552#issuecomment-2298416555

   @DaanHoogland 
   I had a look at issue https://github.com/apache/cloudstack/issues/8562 which 
has been fixed by #8599 
   
   Assume there are two public IPs in the VPC VR (and isolated network VR):
   - xx.xx.64.x (source nat, default public IP), on eth1
   - xx.xx.96.x (additional public ip range). on ethX
   
   
   I think the expected behaviour should be
   - all vms (without Static Nat) has the source Ip xx.xx.64.x (this is current 
behaviour)
   - the VR should be able to connect to xx.xx.96.x network with source ip 
xx.xx.96.x (otherwise the gateway check may fail, see #9473)
   - the VMs should be able to connect to xx.xx.96.x network with source ip 
xx.xx.64.x or xx.xx.96.x (to be discussed)
   
   currently the rules are
   ```
   -A POSTROUTING -j SNAT -o eth1 --to-source xx.xx.64.x
   -A POSTROUTING -j SNAT -o ethX --to-source xx.xx.64.x
   ```
   
   seems better to change to
   ```
   -A POSTROUTING -j SNAT -o eth1 --to-source xx.xx.64.x
   -A POSTROUTING -j SNAT -o ethX --to-source xx.xx.96.x
   ```
   or 
   ```
   -A POSTROUTING -j SNAT -o eth1 --to-source xx.xx.64.x
   -A POSTROUTING -j SNAT -o ethX -d xx.xx.96.1 --to-source xx.xx.96.x  (96.1 
is gateway)
   -A POSTROUTING -j SNAT -o ethX ! -d xx.xx.96.1 --to-source xx.xx.64.x  (96.1 
is gateway)
   ```
   
   to be discussed


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