What Is IP Passthrough And IP Passthrough Mode? – June 2022

IP Passthrough

The Internet service provider (ISP) assigned IP address is shared or “passed” to a single equipment linked to the router in IP Passthrough mode. IP Passthrough is always utilized. Your computer’s network IP addreto a single LAN client device connected to the routerss has been allocated.

What Is The Purpose Of IP Passthrough?

A single computer on the network is assigned the router’s public IP address through the IP Passthrough option. All other hosts on the private LAN subnet will be able to use the same public IP address for PAT–Network Address Port Translation (NAPT) via a unique public IP address, ensuring total segregation of network traffic.

Benefits of Using IP Passthrough

Most ISPs now sell combos of router + modem devices. Modern routers function as both a modem and a NAT router, allowing you to connect several devices to the internet simultaneously.

A typical modem just provided an IP address for internet access, but most modern integrated units are now able to act as both a NAT router and a WIFI access point.

This is ideal for most houses since it means you won’t have to purchase an extra piece of equipment to enjoy WIFI or the security of a NAT router. However, many individuals would prefer to use their own device for enhanced performance, control, or whatever reason.

If you have a modem with all of the extra features disabled, it will only pass internet traffic straight to your router and let it do all the work.

Unless you configure them carefully, the other ways to achieve this result are (1) Running two NAT routers in parallel, which would degrade performance dramatically; or (2) Combining both of your networks into one range that’s under the control of a single router.

IP Passthrough Vs Bridge Mode


What Is The IP Pass-through Mode?

In IP pass-through mode, the ISP connects to the gateway using its own IP address. In this case, people are able to utilize their own router behind the ISP-provided gateway. The signal is terminated at the gateway in IP pass-through mode, allowing the ISP to connect to it with its own IP address. The traffic will still go through the gateway.

What Is A Bridge Mode?

bridge mode

A modem and router bundle supplied by an Internet Service Provider (ISP) allows you to connect a computer or other network device to the ISP’s internet connection, which is sometimes referred to as “directly connected.” Customers may wish to utilize their own router rather than the gateway’s built-in router from time to time.

We can utilize the bridge mode to transform our router into a modem while preserving its performance. In bridge mode, you won’t be able to assign a static IP address to the gateway because it is now a layer 2 device. The network before and after the bridged gateway is part of the same network.

You can’t employ bridge mode with NAT unless you’re blocking any traffic. However, most routers do allow you to utilize DHCP server features. You won’t run into a duplicate NAT issue since your gateway has been configured so that it does not have NAT.

When you have two devices that must be in the same LAN but are separated by a NAT, it’s known as a double NAT. Because of the presence of two routers, this is one of the most typical causes for double NAT.

You may be able to enable bridge mode on your gateway depending on the type. Some ISPs choose to do it themselves, and you may need to contact them if this is the case.

What Is Meant by running double NAT?

You may join two routers to expand Wi-Fi coverage at your place. However, when you have two routers with their own private Wi-Fi networks, your personal devices might struggle to interact with each other. This is known as Double NAT.

Frequently Asked Questions

When you enable IP Passthrough on the modem, you may notice significant lag spikes while playing games. To address the issue, passthrough is to be disabled.

A pass-through VPN pass-through is a feature that allows any devices connected to the router to create outbound VPN connections. To put it another way, this feature does precisely what it promises—it enables VPN traffic to flow because old VPN protocols such as PPTP and L2TP (an outdated IPsec version) do not recognize and block it

The user interface of a modem that is in pass-through mode disables the LAN DHCP and firewall. If required, this may be used by a customer with a Static IP address.


The bridge mode and IP passthrough mode provide comparable services: all traffic is sent through the gateway, and the public IP is assigned to the customer’s router.

The bridge mode does not terminate the network traffic at the gateway, whereas the IP passthrough does. Instead of using the bridge mode, use IP passthrough for ISPs to connect to the gateway.