mjhjmtu

I am trying to configure IPv4 and IPv6 address on Internal network Vagrant interface but I am unable to do so.

Here is the configuration:

 config.vm.network "private_network", 
 ip: "192.168.30.10",
 ip: "fd::10",
 virtualbox__intnet: true,
 bridge: "eth1"
 config.vm.network "private_network",
 ip: "192.168.40.10",
 virtualbox__intnet: true,
 bridge: "eth2"

Ideally I would love to setup link-local address manually but I got error when booting up VM. For now I can work with private IPv6 addresses. Is the only way to turn off auto-config and set it up inside VM?

You can absolutely Disable Auto-Configuration using the auto_config property as shown below:

Vagrant.configure("2") do |config|
 config.vm.network "private_network", ip: "192.168.30.10",
 auto_config: false
end

Then you can just run some shell provisioners later on to configure them how you want them:

 # default router
 config.vm.provision "shell",
 run: "always",
 inline: "route add default gw 192.168.0.1"

 # default router ipv6
 config.vm.provision "shell",
 run: "always",
 inline: "route -A inet6 add default gw fc00::1 eth1"

 # delete default gw on eth0
 config.vm.provision "shell",
 run: "always",
 inline: "eval `route -n | awk ' if ($8 =="eth0" && $2 != "0.0.0.0") print "route del default gw " $2; '`"