| 1 | <?xml version='1.0' encoding='UTF-8'?>
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| 2 | <!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
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| 3 | <topic xml:lang="en-us" id="security-networking">
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| 4 | <title>Networking</title>
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| 5 |
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| 6 | <body>
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| 7 | <p> The default networking mode for VMs is NAT which means that the VM acts like a computer
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| 8 | behind a router, see <xref href="network_nat.dita">Network Address Translation (NAT)</xref>.
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| 9 | The guest is part of a private subnet belonging to this VM and the guest IP is not visible
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| 10 | from the outside. This networking mode works without any additional setup and is sufficient
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| 11 | for many purposes. Remember that NAT allows access to the host operating system's loopback
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| 12 | interface. </p>
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| 13 | <p>
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| 14 | If bridged networking is used, the VM acts like a computer
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| 15 | inside the same network as the host, see
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| 16 | <xref href="network_bridged.dita">Bridged Networking</xref>. In this case, the guest has
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| 17 | the same network access as the host and a firewall might be
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| 18 | necessary to protect other computers on the subnet from a
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| 19 | potential malicious guest as well as to protect the guest from
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| 20 | a direct access from other computers. In some cases it is
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| 21 | worth considering using a forwarding rule for a specific port
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| 22 | in NAT mode instead of using bridged networking.
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| 23 | </p>
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| 24 | <p>
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| 25 | Some setups do not require a VM to be connected to the public
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| 26 | network at all. Internal networking, see
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| 27 | <xref href="network_internal.dita">Internal Networking</xref>, or host-only networking,
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| 28 | see <xref href="network_hostonly.dita">Host-Only Networking</xref>, are often sufficient
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| 29 | to connect VMs among each other or to connect VMs only with
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| 30 | the host but not with the public network.
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| 31 | </p>
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| 32 | </body>
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| 33 |
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| 34 | </topic>
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