openstack/openstack-manuals
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Merge "[install] text clean up and clarifications in neutron-concepts"

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2015-11-25 04:59:28 +00:00
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doc/install-guide/source/neutron-concepts.rst
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@@ -14,31 +14,25 @@ Each abstraction has functionality that mimics its physical counterpart:
networks contain subnets, and routers route traffic between different
subnets and networks.
Each router has one gateway that connects to a network, and many
interfaces connected to subnets. Subnets can access machines on other
subnets connected to the same router.
Any given Networking set up has at least one external network. Unlike
the other networks, the external network is not merely a virtually
defined network. Instead, it represents a view into a slice of the
physical, external network accessible outside the OpenStack
installation. IP addresses on the external network are accessible by
anybody physically on the outside network. Because the external network
merely represents a view into the outside network, DHCP is disabled on
this network.
anybody physically on the outside network.
In addition to external networks, any Networking set up has one or more
internal networks. These software-defined networks connect directly to
the VMs. Only the VMs on any given internal network, or those on subnets
connected through interfaces to a similar router, can access VMs
connected to that network directly.
connected through interfaces to a similar router, can access VMs connected
to that network directly.
For the outside network to access VMs, and vice versa, routers between
the networks are needed. Each router has one gateway that is connected
to a network and many interfaces that are connected to subnets. Like a
physical router, subnets can access machines on other subnets that are
connected to the same router, and machines can access the outside
network through the gateway for the router.
to an external network and one or more interfaces connected to internal
networks. Like a physical router, subnets can access machines on other
subnets that are connected to the same router, and machines can access the
outside network through the gateway for the router.
Additionally, you can allocate IP addresses on external networks to
ports on the internal network. Whenever something is connected to a