When a host can't reach the network, the first step is to read its IP, mask, gateway, and DNS — without logging into the switch. Each OS has a different command. This chapter is the reference.
C:\> ipconfig /all
Ethernet adapter Ethernet:
IPv4 Address . . . . . . . . . . . : 10.0.0.42
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 10.0.0.1
DHCP Server . . . . . . . . . . . : 10.0.0.1
DNS Servers . . . . . . . . . . . : 8.8.8.8, 1.1.1.1
IPv6 Address . . . . . . . . . . . : 2001:db8::42
Link-local IPv6 Address . . . . . : fe80::1234%5
C:\> ipconfig /release
C:\> ipconfig /renew
C:\> ipconfig /flushdns
C:\> route print
C:\> netsh interface ipv4 show config$ ifconfig en0
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet 10.0.0.42 netmask 0xffffff00 broadcast 10.0.0.255
inet6 2001:db8::42 prefixlen 64 autoconf
ether aa:bb:cc:dd:ee:ff
$ netstat -nr | head # routing table
$ scutil --dns # DNS servers
$ networksetup -getinfo Wi-Fi2 more sections in this chapter, plus a 2-question quiz.
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