Config Wired Connection On Arch Linux
Short answer: Run sudo dhcpcd.
Original Investigating Article
I was in a cafe called XiangRiKui, where is weird that without wireless network. If you want to connect to the Internet, they will provide you a Ethernet cable. This time, I only took my EPC with Arch Linux installed. And I didn't config any wired connection.
I had to connect to internet with my iPhone's personal hotspot, and open Arch Linux's guide page[1]. And here is the instructions:
$ ip link
The output was:
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN mode DEFAULT
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enp1s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT qlen 1000
link/ether bc:ae:c6:3e:b3:70 brd ff:ff:ff:ff:ff:ff
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DORMANT qlen 1000
link/ether 46:5e:a0:b3:d4:ec brd ff:ff:ff:ff:ff:ff
The interface enp1s0 should be wired interface, since Ethernet interfaces are begin with a letter e. If we're unsure, try:
$ iwconfig
The output was:
wlan0 IEEE 802.11bgn ESSID:"mitnk's iPhone"
Mode:Managed Frequency:2.417 GHz Access Point: EE:7D:28:E3:E1:88
Bit Rate=6 Mb/s Tx-Power=19 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=65/70 Signal level=-45 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:5 Invalid misc:17 Missed beacon:0
lo no wireless extensions.
enp1s0 no wireless extensions.
This indicated that lo and enp1s0 is NOT wireless interfaces.
Now we activate this interface:
$ sudo ip link set enp1s0 up
Genericly, we need to know Subnet mask, Gateway's IP address, etc. But
we can use dhcpcd do this for us. Just type:
$ sudo dhcpcd
To check, run command ifconfig, if you can see something like
inet 192.168.11.168 under enp1s0, the wired connection was done successfully.