Installing HSS Host Driver

Host Socket Sharing (HSS)

Every ENF Router Card comes with the HSS feature, allowing it to handle encryption while directing the encrypted traffic back into the gateway for transmission through another network device (Ethernet, LTE, ect).

Xaprc with WiFiXaprc with HSS
Figure 1: Data flow with WiFi Figure 2: Data flow with HSS

HSS requires the host to install a custom driver described in the section below. Once installed, this driver will automatically detect when the router card wants to direct traffic back into the host. The TCP traffic will follow all routing/iptables rules once directed back into the host.

Note: By default the router card will always connect over WiFi, and failing that will try HSS. There is currently no configuration to have the router card ignore a functional WiFi connection.

Configuring HSS on the host

HSS requires a custom driver to be built and loaded. The preferred install method is using DKMS. Otherwise, the driver would have to be manually rebuilt every time the kernel is updated.

Debian installation

Xaptum maintains a Debian package for the HSS driver. Use the following steps to install it.

Add Xaptums APT repo

apt-key adv --keyserver --recv-keys c615bfaa7fe1b4ca
echo "deb <dist> main" | sudo tee /etc/apt/sources.list.d/xaptum.list
sudo apt-get update

Replace <dist> with your Debian distrobuation (Stretch, Buster, ect)

Install the HSS drivers

sudo apt-get install xaptum-hss-host

DKMS Installation

Systems that do not run Debian can still benefit from the management features that DKMS provides. DKMS will ensure that HSS is recompiled with new kernels and that future updates can be managed.

git clone
cd hss/host
sudo ./dkms-install

Manual installation

If neither our APT repos or DKMS are available the module can be independently built and managed.

Note: Required packages: kernel-devel, git, build-essential, kernel-headers-$(uname -r), sudo

git clone
cd hss/host/src
sudo make install


Routing IPv6 traffic works the same as a non-HSS setup. However, considerations will also have to be made to allow IPv4 traffic to be routed through the secondary network device. The router card will send IPv4 traffic to the ENF servers at

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