![]() Disable MAC Address Learning in a Linux Bridge from the Command Line Let's find out how you can actually do it. If you want to disable MAC address learning in a Linux bridge, you need to set the ageing time to 0. By default the ageing time in a Linux bridge is set to 300 seconds. A timer is associated with each entry in the table, so that the entry expires after a certain period (so-called ageing time), unless it is refreshed before then. When a Linux bridge receives a packet with a new source MAC address from a particular bridge port, it stores the MAC address along with the port number in its MAC learning table. Understand this implication before proceeding. Note: Once MAC learning is turned off, a Linux bridge will flood every incoming packet to the rest of the ports. This post describes who to disable MAC address learning in a Linux bridge. Or you want to manage MAC forwarding table on your own, without relying on the default learning table. Or your network is under attack a large amount of packets with different source MAC addresses are filling up the MAC learning table. For example, you want to inject artificial traffic into the bridge for experimental purposes. Suppose you would like to disable MAC address learning in a Linux bridge for whatever reason. so that it knows how (i.e., to which port) to forward a network packet. Like a hardware Ethernet bridge, a Linux bridge comes with MAC address learning capability built-in. A Linux bridge is often used to set up a transparent proxy/firewall, or to work as a virtual switch which interconnects multiple virtual machines and containers created on a host. Linux has a software implementation of the Ethernet bridge (called Linux bridge) incorporated into the kernel since 2.6. How can I do that?Īn Ethernet bridge is a network component which interconnects multiple Ethernet networks by forwarding packets from one network to another. ![]() ![]() Question: I am troubleshooting Ethernet bridging which I set up with a Linux bridge, and I would like to disable MAC learning on the Linux bridge. ![]()
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