The following blogpost will help you to configure the EdgeRouter DHCPv6 server (dnsmasq) to resolve IPv6 and IPv4 addresses.

You can configure Dnsmasq with the the ra-nmes option to solve this issue.

The following config example may help you to configure it.

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configure
set service dhcp-server use-dnsmasq enable 
set service dns forwarding options 'dhcp-range=::,constructor:switch0,ra-names'
commit; save; exit

sudo service dnsmasq restart

Note: Maybe you have to change the interface behind constructor.

For more information check out the man page from Dnsmasq.