Ephemeral network interfaces

Question

I'm on Ubuntu 20.04 and each other time when I access a web page, Chrome says "Your connection was interrupted ERR_NETWORK_CHANGED".

Running watch -n.1 ifconfig shows my cable, wireless and loopback interfaces and an additional interface named vethRandomSuffix. This interface always disappears from ifconfig output when its TX packets reaches 20, then another vethRandomSuffix appears.

Example veth interface:

veth9f101b1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet6 fe80::e0b1:cff:fe00:aa24  prefixlen 64  scopeid 0x20<link>
        ether e2:b1:0c:00:aa:24  txqueuelen 0  (Ethernet)
        RX packets 3  bytes 126 (126.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 14  bytes 1954 (1.9 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Before I observed this problem, I had many veth interfaces created by VirtualBox, so I uninstalled VirtualBox and then removed all the veth interfaces using this answer: https://superuser.com/a/1307218.

I would appreciate if someone could tell me a way to find what process keeps bringing these interfaces up and down.

Answer 1

As it turns out, Docker also creates interfaces named vethRandomSuffix. I must had brought down one of Docker interfaces when I cleaned them.

My solution was restarting docker service sudo service docker restart.