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CONFIG_UML_NET_ETHERTAP: Ethertap transport

General informations

The Linux kernel configuration item CONFIG_UML_NET_ETHERTAP has multiple definitions:

Ethertap transport found in arch/um/Kconfig.net

The configuration item CONFIG_UML_NET_ETHERTAP:

• prompt: Ethertap transport
• type: bool
• depends on: CONFIG_UML_NET
• defined in arch/um/Kconfig.net
• found in Linux kernels: 2.6.14–2.6.39, 3.0–3.9, 3.10-rc+HEAD

Help text

The Ethertap User-Mode Linux network transport allows a single running UML to exchange packets with its host over one of the host's Ethertap devices, such as /dev/tap0. Additional running UMLs can use additional Ethertap devices, one per running UML. While the UML believes it's on a (multi-device, broadcast) virtual Ethernet network, it's in fact communicating over a point-to-point link with the host.

To use this, your host kernel must have support for Ethertap devices. Also, if your host kernel is 2.4.x, it must have NETLINK_DEV configured as Y or M.

For more information, see http://user-mode-linux.sourceforge.net/old/networking.html That site has examples of the UML command line to use to enable Ethertap networking.

If you'd like to set up an IP network with the host and/or the outside world, say Y to this, the Daemon Transport and/or the Slip Transport. You'll need at least one of them, but may choose more than one without conflict. If you don't need UML networking, say N.

Ethertap transport found in arch/um/Kconfig_net

The configuration item CONFIG_UML_NET_ETHERTAP:

• prompt: Ethertap transport
• type: bool
• depends on: CONFIG_UML_NET
• defined in arch/um/Kconfig_net
• found in Linux kernels: 2.6.0–2.6.13

Help text

The Ethertap User-Mode Linux network transport allows a single running UML to exchange packets with its host over one of the host's Ethertap devices, such as /dev/tap0. Additional running UMLs can use additional Ethertap devices, one per running UML. While the UML believes it's on a (multi-device, broadcast) virtual Ethernet network, it's in fact communicating over a point-to-point link with the host.

To use this, your host kernel must have support for Ethertap devices. Also, if your host kernel is 2.4.x, it must have NETLINK_DEV configured as Y or M.

For more information, see http://user-mode-linux.sourceforge.net/networking.html That site has examples of the UML command line to use to enable Ethertap networking.

If you'd like to set up an IP network with the host and/or the outside world, say Y to this, the Daemon Transport and/or the Slip Transport. You'll need at least one of them, but may choose more than one without conflict. If you don't need UML networking, say N.

Hardware

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