FreeBSD Jail Add Multiple IPv4 / IPv6 Address

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In FreeBSD, you can add multiple IPv4 and IPv6 addresses to a jail by configuring the jail’s network interface. Here are the steps to add multiple IP addresses to a FreeBSD jail:

  1. Identify the network interface of the jail: To add IP addresses to a jail, you need to first identify the network interface of the jail. You can do this by running the following command on the host system:
jls

This command will display a list of all the running jails and their properties, including the jail ID and the network interface of the jail.

  1. Configure the jail’s network interface: Once you have identified the network interface of the jail, you can configure it to use multiple IP addresses. You can do this by editing the jail’s network configuration file. For example, to add two IPv4 addresses and two IPv6 addresses to the jail’s network interface, you can create a file /etc/jail.conf with the following configuration:
jailname {
# other jail configuration options
exec.start = "/bin/sh /etc/rc";
exec.stop = "/bin/sh /etc/rc.shutdown";
exec.clean;
path = "/jailname";
host.hostname = "jailname.example.com";
allow.raw_sockets = "true";

# configure network interface with multiple IP addresses
interface = "vnet0:1,vnet0:2,vnet0:3,vnet0:4";
ip4.addr = "192.168.1.10/24,192.168.1.11/24";
ip6.addr = "fe80::1:2:3:4/64,2001:db8::1:2:3:4/64";
}

In this example, the jail named jailname has a network interface named vnet0, and we are adding four IP addresses to the interface: two IPv4 addresses (192.168.1.10 and 192.168.1.11) and two IPv6 addresses (fe80::1:2:3:4 and 2001:db8::1:2:3:4).

  1. Start the jail: Once you have configured the jail’s network interface, you can start the jail using the following command:
service jail start jailname

Replace jailname with the name of your jail.

  1. Verify the IP addresses: To verify that the IP addresses have been added to the jail’s network interface, you can run the following command inside the jail:
ifconfig -a

This command will display the network interfaces and their IP addresses.

Note that adding multiple IP addresses to a jail can have security implications, and you should ensure that the jail’s firewall rules are properly configured to restrict access to the additional IP addresses.

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