The dhcp server does not listen or respond on VIF interfaces (e.g. eth6.42)

If the file /etc/default/isc-dhcp-server is edited by hand by changing the INTERFACES="" parameter to contain the interfaces then the DHCP server works correctly. This fix is temporary, as the dhcp_server.py script overwrites the configuration files when there is a change to the dhcp-server configuration in VyOS

The best solution that I can think of would actually be to add the options in the cli for "linterfaces" and allow it to have multiple interfaces listed. Something like the following:

service {

dhcp-server {
 
   interface
       eth0
       eth1
       eth6.42    

    shared-network-name IRC-Chat-Test {
        description testing-eth6.42
        subnet 172.16.24.0/24 {
            default-router 172.16.24.1
            dns-server 8.8.8.8
            dns-server 8.8.4.4
            range IRC-Test {
                start 172.16.24.100
                stop 172.16.24.111
            }
        }
    }

This listen Interface should be an optional setting. If interface has a value the /etc/default/isc-dhcp-server should be updated with the falues to make the file look like

INTERFACES="eth0 eth1 eth6.42"