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I want to set up a bridge so that guest VMs on my headless server use the LAN DHCP and not dnsmasq. I followed these instructions: https://jamielinux.com/docs/libvirt-networking-handbook/bridged-network.html#bridge-debian. Looking at the ifconfig results, it seems to give me exactly what I was looking for:

br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500

        inet 192.168.1.210  netmask 255.255.255.0  broadcast 192.168.1.255

        inet6 fe80::4216:7eff:fe63:7516  prefixlen 64  scopeid 0x20<link>

        ether 40:16:7e:63:75:16  txqueuelen 1000  (Ethernet)

        RX packets 8255  bytes 653898 (653.8 KB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 633  bytes 60185 (60.1 KB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0



enp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500

        inet 192.168.1.195  netmask 255.255.255.0  broadcast 192.168.1.255

        ether 40:16:7e:63:75:16  txqueuelen 1000  (Ethernet)

        RX packets 42190  bytes 48646124 (48.6 MB)

        RX errors 0  dropped 3  overruns 0  frame 0

        TX packets 9808  bytes 889965 (889.9 KB)

        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 2215  bytes 510180 (510.1 KB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 2215  bytes 510180 (510.1 KB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0



virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500

        inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255

        ether 52:54:00:7a:ca:5e  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

However, if I try to SSH into my server (192.168.1.195) from another machine (192.168.1.196), I can't connect. Pings from the server can't seem to reach other devices on my LAN, but pings from the server to 8.8.8.8 seem to work OK. My /etc/network/interfaces file looks like the below (the MAC is my server's NIC):

iface enp3s0 inet manual



auto br0

iface br0 inet static

    # Use the MAC address identified above.

    hwaddress ether 40:16:7e:63:75:16

    address 192.168.1.210

    netmask 255.255.255.0

    gateway 192.168.1.1



    bridge_ports enp3s0

    # If you want to turn on Spanning Tree Protocol, ask your hosting

    # provider first as it may conflict with their network.

    bridge_stp on

    # If STP is off, set to 0. If STP is on, set to 2 (or greater).

    bridge_fd 0

I've spent the last two days googling, and re-imaged my server a couple of times as well when things got too broken, and I think I'm just losing the plot... My server is Ubuntu 18.04.2, completely stock other than the libvirt and ssh packages installed. How can I get the server to be reachable by my other network machines?