I'm new to centos and networks and I was reading documents about how to use direct commands on centos7 firewall-cmd using
man 1 firewall-cmd I saw this line:
The first argument of each option has to be ipv4 or ipv6 or eb. With ipv4 it will be for IPv4 (iptables(8)), with ipv6 for IPv6 (ip6tables(8)) and with eb for ethernet bridges (ebtables(8)).
Can somebody explain simply what eb(ethernet bridge) is and give me a vision to its usage as a result I could know when should I use eb rather than ip if I want to setup my firewall rules on a correct format.