Proxmox 6 hetzner subnet lcx problem

main intercafes

# network interface settings; autogenerated
# Please do NOT modify this file directly, unless you know what
# you're doing.
#
# If you want to manage parts of the network configuration manually,
# please utilize the 'source' or 'source-directory' directives to do
# so.
# PVE will preserve these directives, but will NOT read its network
# configuration from sourced files, so do not attempt to move any of
# the PVE managed interfaces into external files!

source /etc/network/interfaces.d/*


auto enp3s0
iface enp3s0 inet static
address 144.76.197.187/27
netmask 255.255.255.192
gateway 144.76.197.161
post-up echo 1 > /proc/sys/net/ipv4/ip_forward
post-up echo 1 > /proc/sys/net/ipv4/conf/eno1/proxy_arp

up route add -net 144.76.197.160 netmask 255.255.255.224 gw 144.76.197.161 dev enp3s0


auto vmbr0
iface vmbr0 inet static
address 144.76.161.128/29
netmask 255.255.255.248
bridge_ports none
bridge_stp off
bridge_fd 0
bridge_maxwait 0



main intercafes

# network interface settings; autogenerated
# Please do NOT modify this file directly, unless you know what
# you're doing.
#
# If you want to manage parts of the network configuration manually,
# please utilize the 'source' or 'source-directory' directives to do
# so.
# PVE will preserve these directives, but will NOT read its network
# configuration from sourced files, so do not attempt to move any of
# the PVE managed interfaces into external files!

source /etc/network/interfaces.d/*


auto enp3s0
iface enp3s0 inet static
address 144.76.197.187/27
netmask 255.255.255.192
gateway 144.76.197.161
post-up echo 1 > /proc/sys/net/ipv4/ip_forward
post-up echo 1 > /proc/sys/net/ipv4/conf/eno1/proxy_arp

up route add -net 144.76.197.160 netmask 255.255.255.224 gw 144.76.197.161 dev enp3s0


auto vmbr0
iface vmbr0 inet static
address 144.76.161.128/29
netmask 255.255.255.248
bridge_ports none
bridge_stp off
bridge_fd 0
bridge_maxwait 0

Ct config
https://ibb.co/xDyYr62
 
You have two network, 144.76.197.160/27 and 144.76.161.128/29
Gateway on Proxmox host - 144.76.197.161
For VMs available only second network.
In you config vmbr0 has IP 144.76.161.129
(for /29 mask: 144.76.161.128 - network, 144.76.161.135 - broadcast)
For VMs available IP: 144.76.161.130, 144.76.161.131, 144.76.161.132, 144.76.161.133, 144.76.161.134 and gateway must be 144.76.161.129

If you get from Hetzner not network, simply 8 IPs, look sample here: https://dominicpratt.de/hetzner-proxmox-network-configuration/