Very low upload speeds when used with proxmox

[mrblithe]

Hello,

I have a dedicated server at Hetzner and have installed Proxmox on it. My goal is to use the main public IP for Proxmox management and allocate an additional public IP for OPNsense. Following hetzner tutorial I've set up a bridged network and requested an extra IP for OPNsense. In the OPNsense VM, I've added two virtual bridges: wmbr0 configured with for WAN DHCP (for additional ip address), and wmbr1 for a private LAN.

So far, everything appeared to be working fine. However, I've encountered an issue: updating OPNsense packages is extremely slow. To troubleshoot, I set up another VM, connected it to wmbr1 (LAN), configured it to use DHCP, and ran a speed test. The download speed seems OK, but the upload is consistently slow or even fails.

If I disable firewall from OPNsense, upload speed returns normal.

Any insights or suggestions to resolve this issue would be greatly appreciated!

source /etc/network/interfaces.d/*

auto lo
iface lo inet loopback

iface lo inet6 loopback

auto enp4s0
iface enp4s0 inet manual

iface eth0 inet manual

# Wan bridge
auto vmbr0
iface vmbr0 inet static
    address <main ip>/26
    gateway <main gateway>
    bridge-ports enp4s0
    bridge-stp off
    bridge-fd 0
    hwaddress <main nic's mac address>

# LAN bridge
auto vmbr1
iface vmbr1 inet static
    address 10.40.40.1/24
    bridge-ports none
    bridge-stp off
    bridge-fd 0
    post-up echo 1 > /proc/sys/net/ipv4/ip_forward
    post-up iptables -t nat -A POSTROUTING -s '10.40.40.0/24' -o vmbr0 -j MASQUERADE
    post-down iptables -t nat -D POSTROUTING -s '10.40.40.0/24' -o vmbr0 -j MASQUERADE

OPNsense WM Hardware Info:



OPNsense Interface Settings: