Connecting 2 linux devices using ethernet

I have a laptop (without working WiFi), and a computer connected wirelessly. Both devices are connected by an ethernet cable, and both run Arch Linux. On a previous install (Manjaro), both devices were detected automatically and the laptop could tether through the cable, however I cannot do this after reinstalling with Arch. I'm running KDE, so I'd either need to use its settings UI, or the command line

ip a
1: lo:  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: enp1s0:  mtu 1500 qdisc fq_codel state DOWN group default qlen 1000
    link/ether 94:c6:91:fe:ed:b6 brd ff:ff:ff:ff:ff:ff
3: wlan0:  mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether dc:71:96:f6:c5:75 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.18/24 brd 192.168.0.255 scope global dynamic noprefixroute wlan0
       valid_lft 858089sec preferred_lft 858089sec
    inet6 fe80::2075:e030:c91f:5d44/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever