Here is my networking setup:
The system is running Proxmox (Debian-based) so it has a bunch of VMs.
The default bridge of the system is vmbr0, connected via ethernet to a network with the 192.168.86.0/24 IP range
I wanted to create a new bridge (vmbr1) that bridges the current VM to another network with the 192.168.1.0/24 IP range, via wifi
below is my /etc/network/interfaces
auto lo
iface lo inet loopback
auto enp8s0
iface enp8s0 inet manual
auto vmbr0
iface vmbr0 inet static
address 192.168.86.69/24
gateway 192.168.86.1
bridge-ports enp8s0
bridge-stp off
bridge-fd 0
auto wlo1
allow-hotplug wlo1
iface wlo1 inet static
wpa-conf /etc/wpa.conf
address 192.168.1.69
netmask 255.255.255.0
gateway 192.168.1.1
pre-up sysctl net.ipv4.ip_forward=1
pre-up sysctl net.ipv4.conf.all.proxy_arp=1
post-up /usr/sbin/parprouted -d vmbr1 wlo1
post-up ip addr add $(ip addr show wlo1 |perl -wne 'm|^\s+inet (.*)/| && print $1')/32 dev vmbr1
pre-down ip addr del $(ip addr show wlo1 |perl -wne 'm|^\s+inet (.*)/| && print $1')/32 dev vmbr1
post-down /usr/bin/killall /usr/sbin/parprouted
auto vmbr1
iface vmbr1 inet static
address 192.168.1.69
netmask 255.255.255.0
bridge-ports none
the result of this setup is kinda weird, i set the static IP of a virtual machine as 192.168.1.23, and gateway as 192.168.1.1, but the VM can only ping 192.168.1.23, all other IPs under the 192.168.1.0/24 range will result in no route to host.
