[SOLVED] After a year of no issues, containers can't reach network

[tmikaeld]

I've been running Proxmox Containers on the Hetzner Cloud without any issues for more than a year, upgrades, restarts etc worked fine.

However, yesterday none of the containers can reach the local server IP or any network at all.

I'm using floating IPs assigned to the container directly.

The main host:

auto lo
iface lo inet loopback

iface enp1s0 inet manual

auto vmbr0
iface vmbr0 inet static
    address XXX.181.29.57
    netmask 255.255.255.255
    gateway 172.31.1.1
    bridge_ports enp1s0
    bridge_stp off
    bridge_fd 0

One of the containers:

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
        address XX.216.179.21/32
# --- BEGIN PVE ---
        post-up ip route add 172.31.1.1 dev eth0
        post-up ip route add default via 172.31.1.1 dev eth0
        pre-down ip route del default via 172.31.1.1 dev eth0
        pre-down ip route del 172.31.1.1 dev eth0
# --- END PVE ---

I'm not doing anything special here and I'm clueless as to why the containers can no longer reach anything.

 

[tmikaeld]

Network issue on Hetzner, didn't occurr on new servers so moved to a new node and the problem is gone.