GitHub user prashanthr2 added a comment to the discussion: Unable to ping to  
external network from cloud stack system VM  and  virtual  router

@skatta33 can you clarify if you are noticing issues with all the VM's? or some 
of the guest VM's are working fine?

 Based on the description looks to be bridging issue.  Can you check if your 
KVM hosts have firewalld service running, if yes can you stop and disable it. 
firewalld  interferes with iptables rules created by cloudstack.

Also check if IP forwarding is enabled or not 
sysctl net.ipv4.ip_forward

GitHub link: 
https://github.com/apache/cloudstack/discussions/12396#discussioncomment-15454257

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