GitHub user fnavidan edited a comment on the discussion: VM instances get VR's 
IP as DNS server but cannot resolve through VR

I have tried restarting network with cleanup many times. Sometimes both DHCP 
and DNS services are not deployed on VR and sometimes only DNS service is 
unavailable. I tried one more time now and realized DHCP is working but not 
DNS. I am considering upgrade to 4.20.2 LTS. However, I'm not sure if I can 
directly upgrade from 4.18.2 to 4.20.2 or I should first go for 4.18.2 to 
4.19.x. 

For your reference: 
After network restart, inside a VM:

# dig @149.50.127.132 google.com

; <<>> DiG 9.11.36-RedHat-9.11.36-16.el8_10.4 <<>> @149.50.127.132 google.com
; (1 server found)
;; global options: +cmd
;; connection timed out; no servers could be reached


GitHub link: 
https://github.com/apache/cloudstack/discussions/11749#discussioncomment-14792430

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