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I have multiple subnets on a hypervisor with four Ethernet ports. Two are called subnets. Both of them are utilizing a NordVPN tunnel as their default gateway.

The first subnet LAN can talk to everything, even the internet.

Devices on the second subnet of OPT5 can't communicate outside their subnet's gateway.

The firewall rules and network address translation are usually the first suspects when this happens. I have drawn three conclusions after illustrating my ping test, packet captures, and firewall rules and drawing three conclusions.

  • The WAN, NordVPN and primary router are configured appropriately as demonstrated by the success of LAN.

  • The Firewall has allow all on all interfaces. No reason to suspect.

  • Devices on the OPT5 interface can ping any devices within it's own network

  • Devices on the OPT5 interface can NOT ping any devices on any other subnet

  • Devices on the OPT5 interface can NOT ping any devices on the internet

  • Workstation 10.0.4.2 can not communicate with any devices even within the subnet

  • workstation 10.0.4.3 can

map

firewall rules - WAN

firewall rules- OPT5

NAT

Firewall Rules Hit

UPDATE

I have confirmed the issue is with a PFSense setting dealing with 10.0.4.0/24 specifically. I confirmed this issue is exclusive to 10.0.4.0/24 by creating a replacement network address for my second subnet. The network address is 10.0.6.0/24. I have confirmed everything works as expected. However, I want my 10.0.4.0/24 subnet to communicate across itself as well. I don't know what is preventing my subnet from communicating across to other subnets.

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