No internet after creating vm

[ssldn]

Bumping. Has noone any kind of answers to this? Please

Hi,
I am still a bit confused as of the fact if a routed setup on hetzner (from view of the node, the main IP of the network card to use an addtional ip) needs that the main IP is repeated in the vmbr0 or not. Is it needed for a routed or a bridged setup type? When youve asked Fatih:

it additionally confused me, but somehow I have the feeling that there Fatih was wrong thinking to setup a bridged router config, while he addressed a routed setup, correct?
Is it then further right to make the sense of using routed over bridged clear: A bridged setup can expose the (in case of uncautious admin) not protected main host to the outer world while the routed setup is protecting the main IP because of the uproute which the NIC is using? through gateway and pointopoint as well as broadcast the config secures the network a bit better, perhaps, because the VMs use 78.46.70.29/29 IPs (subnet any of them probably deployed through a DHCP in the VM) but not (like in a bridge) the IP of the host (main ip = 78.46.70.1) ???
Conclusioin:
So, the real routed setup then can be usedwithout having to fear that the node might become inaccessible, when it is like this network setup here?

auto eth0
iface eth0 inet static
        address  138.201.203.16
        netmask  255.255.255.255
        gateway  138.201.203.1
    pointopoint 138.201.203.1
    
auto vmbr0
iface vmbr0 inet static
    address  138.201.203.16
    netmask  255.255.255.255
    bridge_ports none
    bridge_stp off
    bridge_fd 0
    bridge_maxwait 0
        up ip route add 138.201.203.49/32 dev vmbr0
        up ip route add 138.201.203.52/32 dev vmbr0
        up ip route add 138.201.203.56/32 dev vmbr0
        up ip route add 138.201.203.57/32 dev vmbr0

surely taken from Dominic Pratt.
and why not do it like created from the script of schaal?
Like this one...:

# /etc/network/interfaces

### generated using Proxmox-Setup Tool 1.1 from schaal @it UG
### https://schaal-it.com/script-to-install-proxmox-5-x-and-6-x-on-a-dedicated-hetzner-server/
###
### Network-Type routed

# loopback device
auto lo
iface lo inet loopback
iface lo inet6 loopback

# network device
auto enp196s0
iface enp196s0 inet static
    address        123.215.228.229
    netmask        255.255.255.255
    gateway        123.215.228.193
    pointopoint    123.215.228.193
    post-up echo 1 > /proc/sys/net/ipv4/ip_forward
        post-up echo 1 > /proc/sys/net/ipv4/conf/enp196s0/proxy_arp

iface enp196s0 inet6 static
    address        2a01:4f8:241:4859::1
    netmask        128
    gateway        fe80::1
    up sysctl -p

auto vmbr0
iface vmbr0 inet static
    address        123.215.228.229
    netmask        255.255.255.255
    broadcast     123.215.228.255
    bridge_ports    none
    bridge_stp    off
    bridge_fd    0
    up ip route add 123.215.228.227/32 dev vmbr0
    up ip route add 123.215.228.228/32 dev vmbr0

iface vmbr0 inet6 static
    address        2a01:4f8:241:4859::2
    netmask        64

My main question, I gues, is: and WHERE is the difference that makes the one thing work for routed?

And resulting from lack of knowledge about networks, kindly tell me the difference between this and that and why is the one used over the other, in which cases, please??

?