GitHub user weizhouapache added a comment to the discussion: No ping to SSVM 
public ip

> @weizhouapache I found one more clue that the arp table on the un reachable 
> vm has "incomplete entry " on the public gateways . if i added manually to 
> match the same with working one i can able to ping. Is there any changes need 
> to done on kvm host machine ?Thank you in advance
>  
> 
> root@v-17-VM:~# ip route
> default via 10.158.209.1 dev eth2
> 10.158.65.0/25 dev eth1 proto kernel scope link src 10.158.65.21
> 10.158.209.0/25 dev eth2 proto kernel scope link src 10.158.209.11
> 66.173.144.10 via 10.158.65.1 dev eth1
> 169.254.0.0/16 dev eth0 proto kernel scope link src 169.254.137.107
> 
> root@s-16-VM:~# ip r
> default via 10.158.209.1 dev eth2
> 10.158.65.0/25 dev eth1 proto kernel scope link src 10.158.65.15
> 10.158.209.0/25 dev eth2 proto kernel scope link src 10.158.209.10
> 66.173.144.10 via 10.158.65.1 dev eth1
> 169.254.0.0/16 dev eth0 proto kernel scope link src 169.254.249.72

It is strange that ssvm works but cpvm does not.

I recalled an issue with CKS which is caused by sysctl settings for arp #9186

You can also check the sysctl settings on kvm host and in the system vms

`sysctl -a | grep arp`




GitHub link: 
https://github.com/apache/cloudstack/discussions/9420#discussioncomment-10093303

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