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After a seemingly random amount of time I cannot access (ping/ssh/http) a KVM host but can access its guests from anywhere. Restarting the network doesn't fix it. Restarting the machine does. All machines & VMs have static IPs. The network is configured with systemd.network, not netplan, because thats how the hosting provider set it up.

On ubuntu 64 bit 18.04.2 I can set up a bridge with these files in /etc/systemd/network

br0.netdev

[NetDev]
Name=br0
Kind=bridge

br0.network

[Match]
Name=br0

[Network]
Description=network interface on public network, with default route
DHCP=no
Address=x.x.x.x/24
Gateway=x.x.x.x
IPv6AcceptRA=no
NTP=ntp.ovh.net
DNS=127.0.0.1
DNS=x.x.x.x
DNS=x.x.x.x
Gateway=x:x:x:ff:ff:ff:ff:ff

[Address]
Address=x:x:x::/64

[Route]
Destination=x:x:x:ff:ff:ff:ff:ff
Scope=link

uplink.network

[Match]
Name=eno1

[Network]
Bridge=br0

From the host I can ping out to its gateway and www.google.com but not 8.8.8.8. I can download files using apt or curl. So it has connectivity.

What should I do or check to reliably have access on the host ?

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