Network

List of interfaces and conditions

saeta@physics /v/w/d/html> ifconfig
enp4s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
		inet 134.173.33.195  netmask 255.255.255.0  broadcast 134.173.33.255
		inet6 fe80::11ad:758e:ab79:27d4  prefixlen 64  scopeid 0x20<link>
		ether d8:9e:f3:95:7f:31  txqueuelen 1000  (Ethernet)
		RX packets 22335004  bytes 2587987576 (2.5 GB)
		RX errors 0  dropped 62331  overruns 0  frame 0
		TX packets 37255353  bytes 39102859297 (39.1 GB)
		TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
		device interrupt 19

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
		inet 127.0.0.1  netmask 255.0.0.0
		inet6 ::1  prefixlen 128  scopeid 0x10<host>
		loop  txqueuelen 1000  (Local Loopback)
		RX packets 37856759  bytes 17521678995 (17.5 GB)
		RX errors 0  dropped 0  overruns 0  frame 0
		TX packets 37856759  bytes 17521678995 (17.5 GB)
		TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlp3s0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
		ether 90:32:4b:8e:1c:63  txqueuelen 1000  (Ethernet)
		RX packets 0  bytes 0 (0.0 B)
		RX errors 0  dropped 0  overruns 0  frame 0
		TX packets 0  bytes 0 (0.0 B)
		TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

A slightly different take on interfaces, which lists values but not functioning state.

saeta@physics ~> ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
	link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
	inet 127.0.0.1/8 scope host lo
	   valid_lft forever preferred_lft forever
	inet6 ::1/128 scope host
	   valid_lft forever preferred_lft forever
2: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
	link/ether d8:9e:f3:95:7f:31 brd ff:ff:ff:ff:ff:ff
	inet 134.173.33.195/24 brd 134.173.33.255 scope global noprefixroute enp4s0
	   valid_lft forever preferred_lft forever
	inet6 fe80::11ad:758e:ab79:27d4/64 scope link noprefixroute
	   valid_lft forever preferred_lft forever
3: wlp3s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
	link/ether 90:32:4b:8e:1c:63 brd ff:ff:ff:ff:ff:ff

To find the named machines and their current connectivity on a network, use nmap as follows:

saeta@physics ~> nmap -sn 134.173.33.0/24

Starting Nmap 7.60 ( https://nmap.org ) at 2019-09-17 13:57 PDT
Nmap scan report for Gutenberg.Physics.HMC.Edu (134.173.33.5)
Host is up (0.011s latency).
Nmap scan report for Cerberus.Physics.HMC.Edu (134.173.33.42)
Host is up (0.0022s latency).
Nmap scan report for Eddie.Physics.HMC.Edu (134.173.33.50)
Host is up (0.00082s latency).
Nmap scan report for Bran.Physics.HMC.Edu (134.173.33.74)
Host is up (0.00046s latency).
Nmap scan report for Washington.Physics.HMC.Edu (134.173.33.91)
Host is up (0.0023s latency).
Nmap scan report for DHCP-33-102.AC.HMC.Edu (134.173.33.102)
Host is up (0.0016s latency).
Nmap scan report for DHCP-33-104.AC.HMC.Edu (134.173.33.104)
Host is up (0.0019s latency).
Nmap scan report for DHCP-33-112.AC.HMC.Edu (134.173.33.112)
Host is up (0.0014s latency).
Nmap scan report for DHCP-33-114.AC.HMC.Edu (134.173.33.114)
Host is up (0.0029s latency).
Nmap scan report for DHCP-33-116.AC.HMC.Edu (134.173.33.116)
Host is up (0.014s latency).
Nmap scan report for Wegener.Physics.HMC.Edu (134.173.33.164)
Host is up (0.0028s latency).
Nmap scan report for kiosk.Physics.HMC.Edu (134.173.33.165)
Host is up (0.0017s latency).
Nmap scan report for DHCP-33-171.AC.HMC.Edu (134.173.33.171)
Host is up (0.0063s latency).
Nmap scan report for DHCP-33-173.AC.HMC.Edu (134.173.33.173)
Host is up (0.00086s latency).
Nmap scan report for Kepler.Physics.HMC.Edu (134.173.33.183)
Host is up (0.00051s latency).
Nmap scan report for physics.hmc.edu (134.173.33.195)
Host is up (0.00022s latency).
Nmap scan report for Banshee.AC.HMC.Edu (134.173.33.200)
Host is up (0.0016s latency).
Nmap scan report for Sahakian.Physics.HMC.Edu (134.173.33.225)
Host is up (0.0025s latency).
Nmap scan report for 134.173.33.253
Host is up (0.0025s latency).
Nmap scan report for 134.173.33.254
Host is up (0.0011s latency).
Nmap done: 256 IP addresses (20 hosts up) scanned in 2.26 seconds