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What kind of networking is supported by jail?
Traditionally, jails have only supported IP alias based networking. This is where an IP address is assigned to the host’s interface and then used by the jail for network communication. This is typically known as “shared IP” based jails. Another recently developed option is called VNET or sometimes VIMAGE.
What can you do with a VNET jail?
VNET jails give each jail its own isolated copy of the network stack. They get everything from the IP layer up, creating a network stack that is entirely its own, almost anything you could do with a distinct host you can do with a jail and VNET.
How does a shared IP based jail work?
This is where an IP address is assigned to the host’s interface and then used by the jail for network communication. This is typically known as “shared IP” based jails. Another recently developed option is called VNET or sometimes VIMAGE. VNET is a fully virtualized networking stack which is isolated per jail.
Can a VNET jail be used in FreeBSD?
VNET jails are a very powerful feature of FreeBSD, these have only been simple examples which aim to demonstrate the ease in which they can be used and some of their benefits for testing. If you have ever wished that you had extra machines to test with or another network interface to use, you can recreate a lot of that utility by using VNET jails.
How to create a VNET jail with DHCP?
To configure both IPv4 and IPv6: For VNET jails, a default route has to also be specified. To create a a jail with a DHCP interface add the dhcp=on property: The dhcp=on property implies creating a VNET virtual network stack and enabling the Berkley Packet Filter. DHCP cannot work without VNET.
How to start a jail with no IPv4 / 6 address?
To start a jail with no IPv4/6 address, set the ip4_addr and ip6_addr properties, then the defaultrouter and defaultrouter6 properties: Force iocage to regenerate the MAC and HW address (e.g.: after cloning a jail).