Fast and Easy Guide for Connecting from Home to the Office Network

Virtual Private Network (VPN) technology enables secure connections from home back to an office. Employees working from home can securely access all office network resources as if they were in the office. Applications range from data entry to remotely printing shipping labels for staff in a warehouse.

Download Work From Home Guide


What’s Needed

A working-from-home setup can consist of a VPN firewall box in the office and VPN client software running on each computer, tablet or phone at home. In situations where a PBX IP phone from the office is now being used at home, the solution is to also install a VPN firewall in the home (not required for a cloud-based PBX). The VPN firewall at home will then connect all networked devices in the home, including the IP phone, back to the VPN firewall at the office. In this scenario where a VPN firewall is installed in the home, VPN client software is not needed on computers in the home – the firewall negates that need.


If a firewall is to be used in a home, then the firewall would sit between the cable or DSL modem and the WiFi router.


If the cable or DSL modem and the WiFi router are built together as one, then the Firewall would be connected to the WiFi Router but in this scenario, a firewall with built-in WiFi should be used be used because connections to the WiFi network on the home router will not go through the firewall. In this case the home would have two WiFi networks, one that goes through the firewall to connect securely back to the office and the other one used for regular home network traffic which will not pass through the firewall.





The Zyxel Family of Firewalls

Zyxel offers four families of firewalls to meet varying needs as follows:



Zyxel VPN (Virtual Private Network) Firewall product family has all of the basics that you need for a working from home solution.



Zyxel USG (Universal Security Gateway) Firewalls have all of the features of the VPN firewalls plus the ability to detect and block malware like viruses.



Zyxel ATP (Advanced Threat Protection) Firewalls provide the highest level of security protection. ATP firewalls provide all of the features of USG plus Sandboxing which is an “artificial intelligence” type of capability to detect previously unidentified malware.


Zyxel USG FLEX maximizes UTM firewall performance using the power of cloud UTM. USG FLEX offers flexible VPN options (IPsec, SSL or L2TP) to provide flexible secure remote access for remote working and management.



Zyxel NSG (Nebula Security Gateway) Firewalls provide most functions of USG firewalls, but managed through Zyxel Nebula cloud network management platform. NSG Firewalls are designed to be configured completely remotely, ideal for social distancing measures. A Zyxel NSG device can be shipped directly to a home or office, and remotely configured after it has been plugged into the internet.





Mix or match – Zyxel Firewalls will all interconnect with each other. For example, an ATP firewall could be installed in the office while more basic VPN firewalls could be installed in homes. Zyxel firewalls can also work with many other firewall brands because we are certified by ICSA for interoperability. For example, a Zyxel firewall can be used in a home to connect to another brand of ICSA certified firewall in the office. IPSec and SSL can also be mixed on a single firewall – some home users could connect to the office with IPSec while others connect with SSL.

Here is a guide to the number of remote connections that each Zyxel firewall model can handle. This will help you to choose the model that best matches your needs or the needs of your customer. Usability of the maximum number of VPN connections may vary depending on the speed of the internet connection that is used, especially the upload speed from the office out to staff working from home.

Office Firewall Capacity




Maximum Concurrent IPSec Tunnels (Included with Gateway) L2TP Over IPSec (Tablets/Phones) Maximum Concurrent SSL Tunnels  Default Concurrent SSL Tunnels

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VPN2S 20 ☑️  -  -
VPN50 50 ☑️ 50   10
VPN100 100 ☑️  200  30
VPN300  300 ☑️  300  50
VPN1000  1000 ☑️  500  250
ZyWALL110  100 ☑️  150  50
ZyWALL310  300 ☑️  150  50
ZyWALL1100 1000  ☑️  500  250

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USG20-VPN 10 ☑️  15  5
USG20W-VPN 10 ☑️  15  5
USG40 20 ☑️  30*  20*
USG40W  20 ☑️  30*   20* 
USG60  40 ☑️  60*  20*
USG60W 40 ☑️  60*  20*
USG110  100 ☑️ 150   50*
USG210  200 ☑️  150 50*
USG310 300  ☑️  150 50 
USG1100 1000 ☑️ 1500  800
USG1900 2000 ☑️ 2000  1500
USG2200 3000 ☑️ 5000  2000
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USG Flex

USG FLEX 100 40 ☑️ 30 30
USG FLEX 200 100 ☑️ 60 60
USG FLEX 500 300 ☑️ 150 150

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ATP100/100W 40 ☑️  30*  30*
ATP200 40 ☑️  60* 60*
ATP500 200 ☑️ 150* 150*
ATP800 1000 ☑️ 500* 500*


NSG50 10 ☑️
NSG100 40 ☑️  - -
NSG200 200 ☑️  - -
NSG300 300 ☑️  - -

* Increased with latest Firmware (Please Request from Tech Support for Supported Firmware)

Office Firewalls for additional SSL Tunnel Licenses

man-with-laptop One-Time
5 Additional SSL Tunnels on Firewall

10 Additional SSL Tunnels on Firewall

50 Additional SSL Tunnels on Firewall


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VPN2S -  - -
VPN50 ☑️ ☑️ -
VPN100 ☑️ ☑️ ☑️
VPN300 ☑️ ☑️ ☑️
VPN1000 ☑️ ☑️ ☑️
ZyWALL110 ☑️ ☑️ ☑️ 
ZyWALL310 ☑️ ☑️ ☑️ 
ZyWALL1100 ☑️ ☑️ ☑️ 

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USG20-VPN ☑️ ☑️ -
USG20W-VPN ☑️ ☑️ -
USG40 ☑️ ☑️ -
USG40W ☑️ ☑️  -
USG60 ☑️ ☑️
USG60W ☑️ ☑️
USG110 ☑️ ☑️ ☑️ 
USG210 ☑️ ☑️ ☑️ 
USG310 ☑️ ☑️ ☑️ 
USG1100 ☑️ ☑️ ☑️ 
USG1900 ☑️ ☑️ ☑️ 
USG2200 ☑️  ☑️ ☑️ 

zywall110-matrix-thumb copyUSG FLEX

USG FLEX 100 Included Included Included
USG FLEX 200 Included Included Included
USG FLEX 500 Included Included Included

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ATP100/100W Included Included Included
ATP200 Included Included Included
ATP500 Included Included Included
ATP800 Included Included Included


Zyxel SecuExtender Remote User Licenses




window-logo-vector-1 apple-logo-vector-note-1 window-logo-vector-1 apple-logo-vector
1 Client ZyWALLVPN - Free Download  SSLVPNOSX1
5 Clients ZyWALLVPN5 -
Free Download  SSLVPNOSX5
10 Clients ZyWALLVPN10 - Free Download SSLVPNOSX10
50 Clients ZyWALLVPN50 - Free Download  -

**IPSec options for Mac users include 3rd party software like VPN Tracker, L2TP over IPSec in Mac OS, or using a gateway line VPN2S at home.

Download Work From Home Guide



We’re Here to Help

Please don’t hesitate to contact us if we can be of any help.

East of the Mississippi & Canada: (800) 255-4101 Ext 244

West of the Mississippi: (800) 255-4101 Ext 265

Zyxel California based Tech Support team: 800-255-4101 option 5

Zyxel Products are available from Value Added Resellers and Managed Service Providers.
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