Cannot access/ping host, but VMs are working

[ualex]

My setup was working fine until recently (not sure when it broke), I could easily access anything, the host and all VMs. Currently I can still access the VMs, but the Proxmox host cannot be accessed in any way from the local network. OPNsense is running as VM, so it can access the internet and different subnets, but not its own subnet anymore.

What works:
- I can access OTHER subnets (OPNsense is running as gateway on it)

What does not work:
- Cannot connect to other nodes from my 192.168.2.190 IP in the same /24 subnet
- Other nodes cannot connect to 192.168.2.190 IP in the same /24 subnet
- ARP table seems to mix bag, some MAC addresses show up with right ip (but cannot be connected to) and some do not show up at all

So i tried:
- rebooting the Proxmox host
- poweroff Proxmox host
- Modifying the /etc/network/interfaces
- Disable pve-firewall

My ip output looks as follows:

root@pve0:~# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host noprefixroute
       valid_lft forever preferred_lft forever
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master vmbr0 state UP group default qlen 1000
    link/ether 00:d0:b4:01:a3:87 brd ff:ff:ff:ff:ff:ff
3: enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master vmbr1 state UP group default qlen 1000
    link/ether 00:d0:b4:01:a3:88 brd ff:ff:ff:ff:ff:ff
4: enp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master vmbr2 state UP group default qlen 1000
    link/ether 00:d0:b4:01:a3:89 brd ff:ff:ff:ff:ff:ff
5: enp4s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq master vmbr3 state DOWN group default qlen 1000
    link/ether 00:d0:b4:01:a3:8a brd ff:ff:ff:ff:ff:ff
6: eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 7a:5d:04:cd:b5:bd brd ff:ff:ff:ff:ff:ff
7: vmbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 00:d0:b4:01:a3:87 brd ff:ff:ff:ff:ff:ff
    inet 192.168.2.190/24 scope global vmbr0
       valid_lft forever preferred_lft forever
    inet6 fe80::2d0:b4ff:fe01:a387/64 scope link
       valid_lft forever preferred_lft forever
8: vmbr1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 00:d0:b4:01:a3:88 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::2d0:b4ff:fe01:a388/64 scope link
       valid_lft forever preferred_lft forever
9: vmbr2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 00:d0:b4:01:a3:89 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::2d0:b4ff:fe01:a389/64 scope link
       valid_lft forever preferred_lft forever
10: vmbr3: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether 00:d0:b4:01:a3:8a brd ff:ff:ff:ff:ff:ff
11: tap100i0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc mq master vmbr0 state UNKNOWN group default qlen 1000
    link/ether 8a:97:af:cc:39:f3 brd ff:ff:ff:ff:ff:ff
12: tap100i1: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc mq master fwbr100i1 state UNKNOWN group default qlen 1000
    link/ether 8a:20:48:f9:88:39 brd ff:ff:ff:ff:ff:ff
13: vmbr1v300: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 00:d0:b4:01:a3:88 brd ff:ff:ff:ff:ff:ff
14: enp2s0.300@enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr1v300 state UP group default qlen 1000
    link/ether 00:d0:b4:01:a3:88 brd ff:ff:ff:ff:ff:ff
15: fwbr100i1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 5a:f1:e4:a7:30:9f brd ff:ff:ff:ff:ff:ff
16: fwpr100p1@fwln100i1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr1v300 state UP group default qlen 1000
    link/ether ce:54:fc:cc:08:6d brd ff:ff:ff:ff:ff:ff
17: fwln100i1@fwpr100p1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr100i1 state UP group default qlen 1000
    link/ether 5a:f1:e4:a7:30:9f brd ff:ff:ff:ff:ff:ff
18: tap100i2: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc mq master vmbr2 state UNKNOWN group default qlen 1000
    link/ether 2a:04:47:4e:89:dc brd ff:ff:ff:ff:ff:ff

My /etc/network/interfaces:

auto lo
iface lo inet loopback

iface enp1s0 inet manual

iface enp2s0 inet manual

iface enp3s0 inet manual

iface enp4s0 inet manual

auto vmbr0
iface vmbr0 inet static
    address 192.168.2.190/24
    gateway 192.168.2.254
    bridge-ports enp1s0
    bridge-stp off
    bridge-fd 0

auto vmbr1
iface vmbr1 inet manual
    bridge-ports enp2s0
    bridge-stp off
    bridge-fd 0

auto vmbr2
iface vmbr2 inet manual
    bridge-ports enp3s0
    bridge-stp off
    bridge-fd 0

auto vmbr3
iface vmbr3 inet manual
    bridge-ports enp4s0
    bridge-stp off
    bridge-fd 0