GabrielBrascher commented on issue #3351: Have persistent DHCP leases file on 
VRs and cleanup /etc/hosts on VM deletion
URL: https://github.com/apache/cloudstack/pull/3351#issuecomment-546988294
 
 
   @nvazquez has this PR been tested on a shared guest network within a Basic 
Network Zone? I am facing a null pointer when trying to remove the DHCP entry 
rule from a VM that is being stopped.
   
   ACS version: 4.11.3
   
   ```
   java.lang.NullPointerException
           at 
org.apache.cloudstack.network.topology.BasicNetworkVisitor.visit(BasicNetworkVisitor.java:201)
           at 
com.cloud.network.rules.DhcpEntryRules.accept(DhcpEntryRules.java:64)
           at 
org.apache.cloudstack.network.topology.BasicNetworkTopology.applyRules(BasicNetworkTopology.java:390)
           at 
org.apache.cloudstack.network.topology.BasicNetworkTopology.removeDhcpEntry(BasicNetworkTopology.java:464)
           at 
com.cloud.network.element.VirtualRouterElement.removeDhcpEntry(VirtualRouterElement.java:972)
           at 
org.apache.cloudstack.engine.orchestration.NetworkOrchestrator.cleanupNicDhcpDnsEntry(NetworkOrchestrator.java:2933)
   
   ```

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