Docker bridge network can't connect to internet after installing new network card

General
1

I recently installed a new NIC on my server running ubuntu 18.04.

When I rebooted the server, my networking stopped working (systemwide, not just on docker). Prior to this, I hadn’t done any networking configuration, all my NICs worked without configuration.

So I added a simple systemd networking file to enable the NIC that I was originally using (not the newly installed one):

$ cat /etc/systemd/network/20-wired.network
[Match]
name=enp10s0

[Network]
DHCP=yes

This fixed the connectivity situation on the server, but my docker containers are no longer able to access the internet through the bridge network that they establish via docker-compose.

Here’s the inspector view:

[
    {
        "Name": "docker-config_default",
        "Id": "e4e10240ea559565da0e2769972c942b5b310d57775076ac8d9bf3053bcc1d91",
        "Created": "2022-01-30T01:43:25.225740922-08:00",
        "Scope": "local",
        "Driver": "bridge",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": null,
            "Config": [
                {
                    "Subnet": "172.18.0.0/16",
                    "Gateway": "172.18.0.1"
                }
            ]
        },
        "Internal": false,
        "Attachable": true,
        "Ingress": false,
        "ConfigFrom": {
            "Network": ""
        },
        "ConfigOnly": false,
        "Containers": {
            "0f60c41014fbce74d12895dcd3a3388123f43df90ed7626c21002ff826c0b687": {
                "Name": "1",
                "EndpointID": "9ac20a68c41e4691657e1194b8f98b1686e845cae2ce659703f2bd9dfe0f38b8",
                "MacAddress": "02:42:ac:12:00:04",
                "IPv4Address": "172.18.0.4/16",
                "IPv6Address": ""
            },
            "3d131fab79110bf90393b9a50da3975d31847fc8008e72db4124bb70ab76d798": {
                "Name": "2",
                "EndpointID": "0365217316c1c6f3b67a66173b64686e60837af86c6e465a37c9335c0706efb3",
                "MacAddress": "02:42:ac:12:00:02",
                "IPv4Address": "172.18.0.2/16",
                "IPv6Address": ""
            },
            "59db15c3175d02ed75ce29f7766f54929cca47424ce6ed3b003b1ba5b79e86ed": {
                "Name": "3",
                "EndpointID": "fc28fe5c6960ff40d93c651d20da9e694763783d186166ea3e6497ab139fd769",
                "MacAddress": "02:42:ac:12:00:06",
                "IPv4Address": "172.18.0.6/16",
                "IPv6Address": ""
            },
            "85d036d56881cb4b235756f00566a7c547322c669fb2d746581610d01c094856": {
                "Name": "4",
                "EndpointID": "ac787196190d37053ed911c67daef9940d80df6cf544f148fe7e1a1c49fb7697",
                "MacAddress": "02:42:ac:12:00:03",
                "IPv4Address": "172.18.0.3/16",
                "IPv6Address": ""
            },
            "9a302987652d682da63a73f88564505eb374b5e8c482c8a119ffc46845898bbc": {
                "Name": "5",
                "EndpointID": "8ec365210e2e1150218abf5892792724b335a2f4db0bdd2105f4d627434ac21b",
                "MacAddress": "02:42:ac:12:00:07",
                "IPv4Address": "172.18.0.7/16",
                "IPv6Address": ""
            }
        },
        "Options": {},
        "Labels": {
            "com.docker.compose.network": "default",
            "com.docker.compose.project": "docker-config",
            "com.docker.compose.version": "1.29.2"
        }
    }
]

I can’t see any apparent problems here, though brctl show doesn’t seem to include the wired interface in the list of bridged networks:

$ brctl show
bridge name	bridge id		STP enabled	interfaces
br-e4e10240ea55		8000.0242f36469a8	no		veth1db27b0
							veth2b1bd20
							veth6a6c3c1
							veth8ff3e0f
							vethf15df53

Should I expect to see my NIC (enp1s0) in this list, or not?