You might have noticed that some of the information that the ifconfig command provides is not included in the ip a output - such as the stats on transmitted packets. Preferred_lft forever preferred lifetime for IPv6 address Valid_lft forever valid lifetime for IPv6 address Preferred_lft 80866sec preferred lifetime for IPv4 address Valid_lft 80866sec valid lifetime for IPv4 address Link/ether 00:1e:4f:c8:43:fc MAC(hardware) address of the interfaceĭynamic enp0s25 address is dynamically assigned Qdisc pfifo_fast used for packet queueing Mtu 1500 maximum transfer unit (packet size) So, here's a translation of the rest of the ip a shown above. The other values listed also tell us a lot about the interface, but we need to know what words like "brd" and "qlen" represent. Mtu 1500 the maximum transfer unit (packet size) is 1,500 bytes
LOWER_UP the network cable is plugged in and device connected to network MULTICAST the interface supports multicasting BROADCAST the interface supports broadcasting So "enp0s25" tells us a lot about the hardware we're working with. The " p" is the bus number of the ethernet card and the " s" is the slot number. The " en" simply means "ethernet" just like "eth" does for eth0. The interface name depends on the physical location of the hardware. It’s been used on systemd-based Linux systems for some time. The new naming scheme is referred to as the “Predictable Network Interface” naming. If you're wondering why it's called enp0s25 on this system instead of the likely more familiar eth0, a little explanation is in order. The normal network interface is more interesting. We can see the loopback IPv4 address (127.0.0.1) and the loopback IPv6 ( ::1) in the listing. The "lo" interface is clearly the loopback. The two interfaces on this system - the loopback (lo) and network (enp0s25) - are displayed along with a lot of stats. Valid_lft 57295sec preferred_lft 57295sec When you use the ip a (or ip addr) command to get information on all the network interfaces on your system, you're going to see something like this: $ ip aġ: lo: mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 The ip command has a lot to tell you about the configuration and state of your network connections, but what do all those words and numbers mean? Let’s take a deep dive in and see what all the displayed values are trying to tell you.
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