Public network in vagrant

I Need to setup 2 vagrant machine with public network,so follow this link to https://www.vagrantup.com/docs/networking/public_network.html edit the Vagrantfile.

But only one machine only have public static ip. another one not get public static ip.

this is my vagrant machine configuration:

Machine 1 Vagrant File:

    Vagrant.configure("2") do |config|

      config.vm.box = "man2"

      config.ssh.username = "vagrant"
      config.vm.hostname = "www.myhost.net"
      config.ssh.forward_agent = "true"


      config.vm.network "public_network", ip: "192.168.1.10"

      config.vm.provider :virtualbox do |vb|
        vb.customize ["modifyvm", :id, "--memory", "2048"]
      end
      config.vm.synced_folder ".", "/vagrant", :mount_options => ["dmode=777","fmode=666"] 
    end

Machine 2 Vagrant File:

        Vagrant.configure("2") do |config|

          config.vm.box = "man1"
          config.ssh.username = "vagrant"
          config.vm.hostname = "www.myhost.net"
          config.ssh.forward_agent = "true"

         config.vm.network "public_network", ip: "192.168.1.20"

           config.vm.provider :virtualbox do |vb|
            vb.customize ["modifyvm", :id, "--memory", "2048"]
          end

           config.vm.synced_folder ".", "/vagrant", :mount_options => ["dmode=777","fmode=777"]

        end

While Vagrant up

System Ask Which interface should the network bridge to?

I Choose Both machie as 1 "eno1"

        1) eno1
        2) docker0
        3) veth54294ac
        4) virbr0
        5) vethc81d7f7
        6) br-08179b343476
        7) br-1d45dec94893
        ==> default: When choosing an interface, it is usually the one that is
        ==> default: being used to connect to the internet.
            default: Which interface should the network bridge to? 1

then, Vagrant ssh Both machine

only one machine have public static ip , another machine doesn't show public ip.

if I choose Different Bridge network in any one system some think like: (machine 2) to

        1) eno1
        2) docker0
        3) veth54294ac
        4) virbr0
        5) vethc81d7f7
        6) br-08179b343476
        7) br-1d45dec94893

option: 4 (virbro) ot others now, also same issue.

Update 1:

Before I tried Same Setup its working fine, only different Version of Vagrant and VirtualBox

Before Tried:

Fedrora 23

Vagrant 1.8.1

virtualbox 5.0

Now tried:

Fedrora 23

Vagrant 1.8.6

Virtualbox 5.1.6

Any Restrictions in this versions.

Why?

System cannot share same Bridge network ?

Suggest me how to resolve this problem.

Your Vagrantfile seems good to me. It may be your Machine2 IP 192.168.1.20 is assigned to other system. if assigned to other system then DHCP will not assign this IP to your machine. if you are sure these IPs not assigned to other system then make it static otherwise you can give like :

config.vm.network "public_network"

in This case DHCP will release IP that is available.

No need to write separate Vagrantfile for each VM. you can create a single Vagrantfile for multiple VM like:

Vagrant.configure("2") do  |config|                                                       

    config.vm.define :server1 do |server1|
             server1.vm.box = "man1"      
             server1.vm.host_name = "vm1.example.com"
             server1.vm.network "public_network", ip: "192.168.1.10"
             server1.vm.synced_folder ".", "/vagrant", :mount_options => ["dmode=777","fmode=666"]
             server1.vm.provider :virtualbox do |vb|
                   vb.customize ["modifyvm", :id, "--memory", "2048"]
            end    
    end

    config.vm.define :server2 do |server2|
             server2.vm.box = "man1"      
             server2.vm.host_name = "vm2.example.com"
             server2.vm.network "public_network", ip: "192.168.1.20"
             server2.vm.synced_folder ".", "/vagrant", :mount_options => ["dmode=777","fmode=666"]
             server2.vm.provider :virtualbox do |vb|
                   vb.customize ["modifyvm", :id, "--memory", "2048"]
            end
    end
end

if you want to up server1 then do