Why does a device need both IP and MAC addresses?
Computer A could potentially learn the IP Address of Computer 2. And that’s why computers have both MAC Addresses and IP Addresses. MAC Addresses handle the physical connection from computer to computer while IP Addresses handle the logical routeable connection from both computer to computer AND network to network.
Do Bridges use IP or MAC?
The bridge is a layer 2 device in the OSI model, meaning that it uses the MAC address information to make decisions regarding forwarding data packets. Bridges monitor all data traffic in each of the LAN segments connected to its ports. Recall that a port is an input/output connection on a networking device.
What is significant about IP address and MAC address?
The main difference between MAC and IP address is that, MAC Address is used to ensure the physical address of computer. It uniquely identifies the devices on a network. While IP address are used to uniquely identifies the connection of network with that device take part in a network.
How is a bridge domain interface assigned a MAC address?
The first bridge domain interface on a bridge domain is allocated a MAC address. Thereafter, the same MAC address is assigned to all the bridge domain interfaces that are created in that bridge domain. Note You can configure a static MAC address on a bridge domain interface using the mac-address command.
Why do I need a MAC address for a Linux bridge?
Because a bridge is an ethernet device it needs a MAC address. A linux bridge can originate things like spanning-tree protocol frames, and traffic like that needs an origin MAC address. A bridge does not require an ip address.
Why does my Bridge and tap share the same MAC address?
If not, you could use arptables to rewrite the MAC addresses on output based on the egress interface or on input based on destination IP: Unfortunately arptables is also quite buggy in my experience. The reason why your bridge and TAP interface share the same MAC address,is because the bridge does not have a MAC,until its bound to an interface.
Can a physical interface have multiple MAC addresses?
If you bridge a physical network interface,the Ethernet bridge will inherit its MAC address,and move all virtual interfaces down. Example binding eth0,to the test bridge. the TAP interfaces have moved down one,even though eth0,is still at PORT 4. You still have unique MAC addresses.