**DHCP IN JUNOS**:
Apply this whole config, included dhcp server address. Seems not to work on fpx interfaces:
  set interfaces ge-0/0/7 unit 0 family inet dhcp-client client-identifier prefix host-name
  set interfaces ge-0/0/7 unit 0 family inet dhcp-client lease-time 86400
  set interfaces ge-0/0/7 unit 0 family inet dhcp-client retransmission-attempt 6
  set interfaces ge-0/0/7 unit 0 family inet dhcp-client retransmission-interval 5
  set interfaces ge-0/0/7 unit 0 family inet dhcp-client server-address 10.5.0.1
  set interfaces ge-0/0/7 unit 0 family inet dhcp-client vendor-id ether
  set interfaces ge-0/0/7 unit 0 family inet dhcp-client options no-hostname
  

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**DHCP IN LINUX**
  * Remove the default gateway : [[https://superuser.com/questions/306121/i-dont-want-my-dhcp-to-be-a-default-gateway|External Link]]
  * Remove the default gateway : options directly in libvirt net definition : [[https://serverfault.com/questions/840163/custom-dnsmasq-or-custom-options-with-libvrt|External Link]]
  * Vagrant libvirt has the dhcp configuration in: /var/lib/libvirt/dnsmasq/vagrant-libvirt.conf