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# Transports Grid

The Transports grid presents transport definitions in the realm. In edit mode, you can create new transport definitions and modify existing transport definitions. Click the Transports icon .

For background information, see Transport Concepts.

## Levels

- Group
- Transport
- Address

## Group Level

Column | Description
--- | ---
Group | Optional. A group is like a folder or label. You can assign transport definitions to groups to help you organize them by purpose. To see each transport in its group, sort the grid on this column. However, a group is required in one special circumstance. When you define a pair of dynamic TCP transports, you must assign them to the same named group. Without a common group name, the listen and connect ends cannot establish a bus. (This requirement applies only to a listen and connect pair. It does not apply to a mesh.) For background information, see Dynamic TCP Transport.

## Transport Level

Column | Description
--- | ---
Transport | Every transport definition has a name. This column presents transport names. Note: You cannot configure two transport definitions with identical names.
Protocol | Required. Every transport uses a specific protocol to establish a communication bus and to carry messages. See Transport Protocol Types Select a transport protocol type from the drop-down menu.
Last Modified | This timestamp indicates the date and time of the most recent change to this transport definition.

## Address Level

The values in the Address/Subnet, Port Range, and Mode columns depend on the transport's protocol. They present the transport parameters that are most important for connecting to the transport, diagnosing misconfigurations, and distinguishing among transport definitions.

- Dynamic TCP Protocol
  - Address: Empty, or a subnet mask.
  - Port: Auto-Assign, or a TCP port for establishing a bus through a firewall.
  - Mode: Mesh, listen, or connect.
- Connection-Oriented Protocols

  Static TCP, Secure Static TCP, and Reliable UDP are connection-oriented protocols.

  - Address: The host name for establishing a connection.
  - Port: The port number for establishing a connection.
  - Mode: To establish a bus, the transport either listens or connects on the host and port.
- Multicast Protocol
  - Address: A multicast group for communication.
  - Port: The multicast port number for communication.
  - Mode: The transport uses the multicast group in the address column as either a send group or a listen group.
- Shared Memory Protocols

  Shared Memory and Direct Shared Memory protocols use shared memory segments for communication.

  - Address: The name of the shared segment.
  - Port: Empty.
  - Mode: Empty.

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