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General Discussion / OPN in a Proxmox VM, trying to spoof VM NIC to transparently relay to host NIC
« on: August 15, 2022, 06:36:07 pm »
(FYI, this is a cross-post from Proxmox forums, where I got no response: https://forum.proxmox.com/threads/trying-to-spoof-guest-nic-to-transparently-relay-to-host-nic.113600/#post-490741)
I am trying to set up OPNSense inside Proxmox. Unfortunately I cannot pass the interface as is, due to lack of IOMMU support, as I am running this in a nested Azure VM, so I need to get by using bridges.
The host configuration is:
– eth0
– vmbr0 with eth0 assigned to it
The guest configuration is:
– VirtIO NIC attached to vmbr0, with MAC overridden using same address as the eth0
– Firewall: NO
– MAC Filter: NO
Running dhclient on eth0 or vmbr0 correctly discovers and assigns an IP address.
Now, I am trying to get the OPNSense in a VM to get that IP address instead and to relay its traffic via the vmbr0 transparently outside of the host. I have done something very similar previously between OpenWRT running in a VM and another VM, using OpenWRT's "trivial relay" (kmod-trelay, see https://forum.openwrt.org/t/howto-kmod-trelay/49610/2, also https://github.com/openwrt/openwrt/commit/c3bba7f8c61ee98265bcffef8ee86e22aa89bbe9), and despite that this particular case is much simpler, I can't get the VM to communicate with the ISP properly. I tried simply by spoofing the eth0's MAC address by setting the OPNSense VM's interface to it, but that's not enough.
I also checked the traffic on both ends using tcpdump, and, interestingly, vmbr0 does see the DHCP requests coming from the VM, and the ISP does respond, but that response never reaches the VM, nor the tap interface corresponding to the VM that Proxmox assigned to the bridge.
What am I missing here?
I am trying to set up OPNSense inside Proxmox. Unfortunately I cannot pass the interface as is, due to lack of IOMMU support, as I am running this in a nested Azure VM, so I need to get by using bridges.
The host configuration is:
– eth0
– vmbr0 with eth0 assigned to it
Code: [Select]
iface eth0 inet manual
auto vmbr0
iface vmbr0 inet manual
bridge-ports eth0
bridge-stp off
bridge-fd 0The guest configuration is:
– VirtIO NIC attached to vmbr0, with MAC overridden using same address as the eth0
– Firewall: NO
– MAC Filter: NO
Running dhclient on eth0 or vmbr0 correctly discovers and assigns an IP address.
Now, I am trying to get the OPNSense in a VM to get that IP address instead and to relay its traffic via the vmbr0 transparently outside of the host. I have done something very similar previously between OpenWRT running in a VM and another VM, using OpenWRT's "trivial relay" (kmod-trelay, see https://forum.openwrt.org/t/howto-kmod-trelay/49610/2, also https://github.com/openwrt/openwrt/commit/c3bba7f8c61ee98265bcffef8ee86e22aa89bbe9), and despite that this particular case is much simpler, I can't get the VM to communicate with the ISP properly. I tried simply by spoofing the eth0's MAC address by setting the OPNSense VM's interface to it, but that's not enough.
I also checked the traffic on both ends using tcpdump, and, interestingly, vmbr0 does see the DHCP requests coming from the VM, and the ISP does respond, but that response never reaches the VM, nor the tap interface corresponding to the VM that Proxmox assigned to the bridge.
What am I missing here?
