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I have NetworkManager on my Arch Linux machine. Output of ifconfig:

enp0s18f2u1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.241.167 netmask 255.255.255.0 broadcast 192.168.241.255 inet6 fe80::f4cb:ecbe:eb8e:c961 prefixlen 64 scopeid 0x20<link> ether 46:0b:4a:d9:56:dd txqueuelen 1000 (Ethernet) RX packets 9132 bytes 11251343 (10.7 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 6571 bytes 998708 (975.3 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 enp3s0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 ether 90:2b:34:96:0c:2e 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 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 8 bytes 1021 (1021.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 8 bytes 1021 (1021.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

enp0s18f2u1 is my USB tethering interface. Why do I have enp3s0? Why does my connection speed drops to rock-bottom after I replug the cable until I reboot my PC?

dmesg:

[ 31.007291] usb 1-1: USB disconnect, device number 3 [ 31.438343] usb 1-1: new high-speed USB device number 4 using ehci-pci [ 31.585979] usb 1-1: New USB device found, idVendor=0e8d, idProduct=2004, bcdDevice= 2.23 [ 31.585989] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 31.585995] usb 1-1: Product: Nokia 2.2 [ 31.585999] usb 1-1: Manufacturer: HMD Global [ 31.586003] usb 1-1: SerialNumber: HZAL1670CAJ61222625 [ 31.664819] usbcore: registered new interface driver cdc_ether [ 31.675846] rndis_host 1-1:1.0 usb0: register 'rndis_host' at usb-0000:00:12.2-1, RNDIS device, 92:38:f4:ee:51:a2 [ 31.675882] usbcore: registered new interface driver rndis_host [ 31.686275] rndis_host 1-1:1.0 enp0s18f2u1: renamed from usb0 [ 31.905225] kauditd_printk_skb: 7 callbacks suppressed [ 1365.294661] usb 1-1: new high-speed USB device number 5 using ehci-pci [ 1365.418013] usb 1-1: device descriptor read/64, error -32 [ 1365.672302] usb 1-1: New USB device found, idVendor=0e8d, idProduct=2008, bcdDevice= 2.23 [ 1365.672313] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 1365.672319] usb 1-1: Product: Nokia 2.2 [ 1365.672323] usb 1-1: Manufacturer: HMD Global [ 1365.672326] usb 1-1: SerialNumber: HZAL1670CAJ61222625 [ 1375.172543] usb 1-1: USB disconnect, device number 5 [ 1375.604696] usb 1-1: new high-speed USB device number 6 using ehci-pci [ 1375.752534] usb 1-1: New USB device found, idVendor=0e8d, idProduct=2004, bcdDevice= 2.23 [ 1375.752541] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 1375.752544] usb 1-1: Product: Nokia 2.2 [ 1375.752546] usb 1-1: Manufacturer: HMD Global [ 1375.752549] usb 1-1: SerialNumber: HZAL1670CAJ61222625 [ 1375.754881] rndis_host 1-1:1.0 usb0: register 'rndis_host' at usb-0000:00:12.2-1, RNDIS device, be:c0:2b:4b:c4:a9 [ 1375.792804] rndis_host 1-1:1.0 enp0s18f2u1: renamed from usb0 [ 1375.963532] kauditd_printk_skb: 1 callbacks suppressed

Why does rndis_host 1-1:1.0 enp0s18f2u1: renamed from usb0 happens?

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Why do I have enp3s0?

Because you have some hardware in "position 3, slot 0" that is detected as an ethernet interface. If this is a PC, first step is to use lspci to find out more about what hardware you have, as it's probably some PCIe device.

Why does my connection speed drops to rock-bottom after I replug an USB cable until I reboot my PC?

No idea, that needs debugging on what actually happens when you replug the cable. Start by looking at dmesg.

[ 1365.418013] usb 1-1: device descriptor read/64, error -32

This indicates an error while using USB. The second attempt 10 seconds later succeeded, but something is unstable, and I wouldn't be surprised if you find more USB errors when it "gets slow", or a slower USB rate on the second connection (check with lsusb). My first guess would be a hardware or firmware problem in your USB modem, and/or power supply issues.

Why does rndis_host 1-1:1.0 enp0s18f2u1: renamed from usb0 happens?

Because Linux uses "predictable interface names", and they are made predictable by renaming them applying udev rules. Perfectly normal, and not related to your slow connection.

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  • I can't find anything useful in the dmesg. I've updated my question with the output of it. Commented Apr 22, 2022 at 5:14
  • >and related to your slow connection. But how could interface name be related to connection speed? Commented Apr 22, 2022 at 11:16
  • 1
    "not related", of course. Commented Apr 22, 2022 at 12:53

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