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68 lines
2.6 KiB
ReStructuredText
68 lines
2.6 KiB
ReStructuredText
:lastproofread: 2023-01-26
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.. _pseudo-ethernet-interface:
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#########################
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MACVLAN - Pseudo Ethernet
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#########################
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Pseudo-Ethernet or MACVLAN interfaces can be seen as subinterfaces to regular
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ethernet interfaces. Each and every subinterface is created a different media
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access control (MAC) address, for a single physical Ethernet port. Pseudo-
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Ethernet interfaces have most of their application in virtualized environments,
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By using Pseudo-Ethernet interfaces there will be less system overhead compared
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to running a traditional bridging approach. Pseudo-Ethernet interfaces can also
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be used to workaround the general limit of 4096 virtual LANs (VLANs) per
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physical Ethernet port, since that limit is with respect to a single MAC
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address.
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Every Virtual Ethernet interfaces behaves like a real Ethernet interface. They
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can have IPv4/IPv6 addresses configured, or can request addresses by DHCP/
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DHCPv6 and are associated/mapped with a real ethernet port. This also makes
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Pseudo-Ethernet interfaces interesting for testing purposes. A Pseudo-Ethernet
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device will inherit characteristics (speed, duplex, ...) from its physical
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parent (the so called link) interface.
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Once created in the system, Pseudo-Ethernet interfaces can be referenced in
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the exact same way as other Ethernet interfaces. Notes about using Pseudo-
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Ethernet interfaces:
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* Pseudo-Ethernet interfaces can not be reached from your internal host. This
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means that you can not try to ping a Pseudo-Ethernet interface from the host
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system on which it is defined. The ping will be lost.
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* Loopbacks occurs at the IP level the same way as for other interfaces,
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ethernet frames are not forwarded between Pseudo-Ethernet interfaces.
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* Pseudo-Ethernet interfaces may not work in environments which expect a
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:abbr:`NIC (Network Interface Card)` to only have a single address. This
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applies to:
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- VMware machines using default settings
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- Network switches with security settings allowing only a single MAC address
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- xDSL modems that try to learn the MAC address of the NIC
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*************
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Configuration
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*************
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Common interface configuration
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==============================
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.. cmdinclude:: /_include/interface-common-with-dhcp.txt
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:var0: pseudo-ethernet
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:var1: peth0
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Pseudo Ethernet/MACVLAN options
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===============================
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.. cfgcmd:: set interfaces pseudo-ethernet <interface> source-interface <ethX>
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Specifies the physical `<ethX>` Ethernet interface associated with a Pseudo
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Ethernet `<interface>`.
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VLAN
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====
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.. cmdinclude:: /_include/interface-vlan-8021q.txt
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:var0: pseudo-ethernet
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:var1: peth0
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