dnsmasq in Virtual Router fails to start in IPv6 enabled network

[wido]

ISSUE TYPE

• Bug Report

COMPONENT NAME

Virtual Router

CLOUDSTACK VERSION

4.13.1
4.14

CONFIGURATION

• Advanced Networking
• IPv6 Enabled in Network

OS / ENVIRONMENT

• Ubuntu 18.04

SUMMARY

Then creating a network with IPv6 Enabled but the DNS 1 and DNS 2 IPv6 for the zone haven't been specified these values remain empty in the dnsmasq configuration on the Virtual Router:

dhcp-option=option6:dns-server,

This causes dnsmasq not to start as the configuration is not valid.

STEPS TO REPRODUCE

• Create an Advanced Zone
• Do not fill in IPv6 DNS 1 and DNS 2
• Create a Shared Network with Ipv6 enabled
• Try to boot a VM

EXPECTED RESULTS

dhcp-option=option6:dns-server,[2a00:f10:ff04:153::53],[2a00:f10:ff04:253::53]

In this case 2a00:f10:ff04:153::53 and 2a00:f10:ff04:253::53 are two DNS resolvers from PCextreme.

There should be a check that dnsmasq starts or that the Management Server refuses to start (with a proper message) the VR because IPv6 DNS 1 and DNS 2 haven't been configured.