Hetzner, PVE 7.0 problems after reboot. Maybe ifupdown2

I tried the add pointopoint again and it worked for the main ip
I have a second IP in the Range (+1 higher than the Main ip)
This IP is bound to the MAC of a VM
As soon as I added pointopoint and changed the mask to /32 for the main ip in the bridge, the VM was not reachable anymore
 
I tried the add pointopoint again and it worked for the main ip
I have a second IP in the Range (+1 higher than the Main ip)
This IP is bound to the MAC of a VM
As soon as I added pointopoint and changed the mask to /32 for the main ip in the bridge, the VM was not reachable anymore
please post your proxmox /etc/network/interfaces && your vm guest os ip configuration
 
here the current
Code:
auto lo
iface lo inet loopback

iface enp9s0 inet manual

auto vmbr0
iface vmbr0 inet static
        address 144.76.91.x/27
        gateway 144.76.91.161
#       pointopoint 144.76.91.161
        bridge-ports enp9s0
        bridge-stp off
        bridge-fd 1
        bridge_hello 2
        bridge_maxage 12


auto vmbr1
iface vmbr1 inet manual
        bridge-ports none
        bridge-stp off
        bridge-fd 0

the change I tried ... uncomment the point to point and changed /27 to /32

The VM is connected vmbr0 - it is opnsense firewall
With WAN port 144.76.91.(x+1)/27
Which words fine in this config above
 
here the current
Code:
auto lo
iface lo inet loopback

iface enp9s0 inet manual

auto vmbr0
iface vmbr0 inet static
        address 144.76.91.x/27
        gateway 144.76.91.161
#       pointopoint 144.76.91.161
        bridge-ports enp9s0
        bridge-stp off
        bridge-fd 1
        bridge_hello 2
        bridge_maxage 12


auto vmbr1
iface vmbr1 inet manual
        bridge-ports none
        bridge-stp off
        bridge-fd 0

the change I tried ... uncomment the point to point and changed /27 to /32

The VM is connected vmbr0 - it is opnsense firewall
With WAN port 144.76.91.(x+1)/27
Which words fine in this config above
so, are you sure that you need point to point ?
for me, pointtopoint setup are needed when gateway is outside your subnet. (some hosting provider require it),
and generally, you have a routed setup. (hypervisor have main ip pointopoint, with another(s) subnet(s), and vm are use hypervisor ip as gateway)
here you have a full /27 (bridged i think?), so it don't seem to be needed.
 
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