Configure dns for ubuntu vlan?

Question

PHP

There is an ubuntu router, the Internet receives dhcp via vlan, i.e. dns is default from the provider, then there are three vlans for the needs of the company, inside the vlan everything works, the end equipment in each vlan is pinged, and even external ip in these vlans are pinged, since the gateway is configured with a masquerade, but the problem is that dns does not work in these three vlans, i.e. external for example 8.8.8.8 pings from a computer in the vlan, but the sites do not work by name, what can be? in the policy fusee all accept. Thanks

Answer 1

1. sudo is not needed for bru.
2. demolish everything that was installed and put it as it should.brew install php

Answer 2

Glitch, after the reboot everything started

Answer 3

and what is in computers in vlans as DNS servers?