Linux dummy interface mac address

The specified gateway is external to the host provided by the network infrastructure. Each Macvlan Bridge mode Docker network is isolated from one another and there can be only one network attached to a parent interface at a time. There is a theoretical limit of 4, sub-interfaces per host adaptor that a Docker network could be attached to. Any container inside the same subnet can talk to any other container in the same network without a gateway in macvlan bridge. The same docker network commands apply to the vlan drivers. This also applies to multiple subnets within the same docker network.

In the following example, eth0 on the docker host has an IP on the The gateway is an external router with an address of An IP address is not required on the Docker host interface eth0 in bridge mode, it merely needs to be on the proper upstream network to get forwarded by a network switch or network router.

I can rename it using 'ip link set dummy0 name xxx '. What's the best location to do this? Other services will depend on this interface so I can't rename in rc. Should I customize the rcN. Tags dummy. Search this Thread Advanced Search. BB code is On. Smilies are On. All times are GMT The time now is PM.

Using a dummy network interface

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Bridge Interfaces

Routing, network cards, OSI, etc. Anything is fair game. The second purpose exploits the fact they are always up unless administratively taken down. This is often used to assign service addresses to them on routers with more than one physical interface. As long as the traffic to the address assigned to a loopback or dummy interface is routed to the machine that owns it, you can access it through any of its interfaces.

Bridge interfaces are virtual ethernet switches. They can be used to relay traffic transparently between ethernet interfaces, and, increasingly common, as ethernet switches for virtual machines running inside hypervisors. Interface you added to a bridge becomes a virtual switch port. It operates only on datalink layer and ceases all network layer operation.

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[libvirt] RFC: Setting a permanent MAC address for virtual network bridg

Note: This is not enough to configure bonding link aggregation in any meaningful way. You need to set up bonding parameters according to your situation. This is far beyond the cheat sheet scope, so consult the documentation. Interfaces are added to the bond group the same way to bridge group, just note that you can't add it until you take it down. Intermediate functional block devices are used for traffic redirection and mirroring in conjunction with tc. This is also far beyond the scope of this document, consult tc documentation. Virtual ethernet veth devices always come in pairs and work as a bidirectional pipe, whatever comes into one of them, comes out of another.

They are used in conjunction with system partitioning features such as network namespaces and containers OpenVZ and LXC for connecting one partition to another.

Get started with Macvlan network driver

Note: virtual ethernet devices are created in UP state, no need to bring them up manually after creation. Link groups are similar to port ranges found in managed switches. You can add network interfaces to a numbered group and perform operations on all the interfaces from that group at once.

Symbolic name "default" for group 0 comes exactly from there.


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You can have up to named groups. Once you configured a group name, number and name can be used interchangeably in ip commands. Tun and tap devices allow userspace programs to emulate a network device. When the userspace program opens them they get a file descriptor. Packets routed by the kernel networking stack to the device are read from the file descriptor, data the userspace program writes to the file descriptor are injected as local outgoing packets into the networking stack. The difference between the two is:. The commands listed here manipulate persistent devices.

Add meta information to each packet received over the file descriptor. Very few programs expect this information, and including it when it isn't expected will break things. Note: you must specify the mode. The mode is not displayed in "ip link show", so if you don't know if it's TUN or TAP, consult the output of "ip tuntap show". Tunnels are "network wormholes" that look like normal interfaces, but packets sent through them are encapsulated into another protocol and sent to the other side of tunnel through multiple hosts, then decapsulated and processed in usual way, so you can pretend two machines have direct connectivity, while they in fact do not.

This is often used for virtual private networks in conjunction with encrypted transport protocols like IPsec , or connecting networks that use some protocol via an intermediate network that does not use it e. IPv6 networks separated by an IPv4-only segment. Note: tunnels on their own offer zero security. They are as secure as their underlying network. So if you need security, use them over an encrypted transport, e.

This type of tunnels is commonly used to provide an IPv4-connected network with IPv6 connectivity. There are so called "tunnel brokers" that provide it to everyone interested, e. Hurricane Electric tunnelbroker. This type of tunnels will be widely used when transit operators phase IPv4 out i. Recent kernel and iproute2 versions also support gretap over IPv6, you need to replace the mode with "ip6gretap" to create an IPv6-based link. This probably should have been in "Links management" section, but as it involves encapsulation, it's here.

Tunnel interface created this way looks like an L2 link, and it can be added to a bridge group. This is used to connect L2 segments via a routed network. Keyed tunnels can be used at the same time to unkeyed too. Key may be in dotted decimal IPv4-like format. Note that key does not add any security to the tunnel.

It's just an identifier used to distinguish one tunnel from another. This is the same to what is called "mode gre multipoint" in Cisco IOS. This type of tunnels allows you to communicate with multiple endpoints by using the same tunnel interface.


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It's commonly used in complex VPN setups with multiple endpoints communicating to one another in Cisco terminology, "dynamic multipoint VPN". As there is no explicit remote endpoint address, obviously it is not enough to just create a tunnel. Your system needs to know where the other endpoints are.

What is a MAC Address

For testing you can add peers manually given remote endpoint uses Note that link-layer address and neighbor address are both IP addresses, so they are on the same OSI layer. This one of the cases where link-layer address concept gets interesting. Note that in older iproute2 versions this command did not support the full "delete" word, only "del".

Recent versions allow both full and abbreviated forms tested in iproute2-ss Note: Apparently you can't add a key to previously unkeyed tunnel. Not sure if it's a bug or a feature. Also, you can't change tunnel mode on the fly, for obvious reasons. L2TPv3 is a tunneling protocol commonly used for L2 pseudowires. In many distros L2TPv3 is compiled as a module, and may not be loaded by default. Compared to other tunneling protocol implementations in Linux, L2TPv3 terminology is somewhat reversed.