Hello, We started facing strange issue with cloudstack VM. where all the VMs in one particular tenant are not able to resolve DNS. since we are using advanced networking we have tried to reboot virtual router and other DNS services. still that particular tenant is not able to resolve the DNS.
following troubleshooting steps completed. 1) From the tenant (with issue) we are able reach DNS server with ICMP (ping) 2) from other tenant we are able to reach DNS server on ICMP. also DNS resolution working from other tenant. 3) We have checked ingress and egress traffic settings where we have allowed all inbound and outbound but still DNS resolution is not working. NOTE: DNS server is currently hosted in public network subnet which is being used by all the tenants
