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HHC-NET2D · standalone relay

Cycles the router and the modem. No firewall needed.

The NET2D is a 2-channel Ethernet relay board running its own firmware. It watches the uplink with a ping watchdog, rolls back to a known-good firmware on its own, and can power-cycle hardware a USB relay plugged into that same hardware never could.

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Where it sits

Two relays: one for the modem, one for the router.

The board pings the local gateway and the WAN IP. Gateway up but WAN down means a modem fault, so it cycles the modem. Gateway down means the router itself is unreachable, so it cycles both.

ALL UP — modem and router powered WAN DOWN · gateway up — cycle the modem GATEWAY DOWN — cycle both relays network no firewall Ethernet — pings gateway + WAN NET2D 2-channel relay modem PSU 12V DC router PSU 12V DC modem DC IN router DC IN WAN gateway COM NC NO relay 1 relay 2 each relay wires the + line through COM → NC · NO unused
The board pings the local gateway and the WAN IP. Gateway up but WAN down means a modem fault, so relay 1 cycles the modem. Gateway down means the router itself is unreachable, so it cycles both.

What makes it different

Vigil needs a firewall. This does not.

Its own ping watchdog

Runs standalone with no firewall involved. It pings the local gateway and the WAN IP, then decides which relay to fire.

A/B firmware rollback

Two firmware slots. A bad update falls back to the last known-good build automatically.

Two channels

Cycle the router and the modem — something a USB relay plugged into that router cannot do.

No licence, no check-in

A hardware sale, not a subscription. It does not check in and stays out of the Vigil licensing system — but continued support and firmware updates are a yearly purchase.

Support & firmware

Continued support and updates are a yearly purchase.

There is no licence and no check-in — but firmware updates and ongoing support are not free. A yearly support & firmware renewal covers both: files you download and apply manually with the vendor tool, never pushed from the Vigil repository.

The renewal stays out of the licensing database — there is nothing to track there.

At a glance

  • 2-channel Ethernet relay board
  • Ping watchdog with A/B rollback
  • Works with no firewall
  • No licence — support & firmware renewal

Configuration

Set it up over the network, from a shell.

Configure it over the network from a shell. No agent to install, no cloud account, no vendor software on Windows — point a small helper script at the board’s address and it answers.

NET2D status output showing firmware slot, link, relay states and probe results
One command reports the firmware slot, uptime, link, both relay states, and whether the LAN and WAN probes are passing. Grey text is annotation, not output.

HHC-NET2D

Ship a standalone watchdog.

The NET2D is available to buy now. Shipping is calculated at checkout.

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