So Deco will work as the network agent between them in order to make clients have internet service. Understanding this issue better, we will try to explain more. Under the network layout AT&T Internet - AT&T Fiber Router (BGW210/BGW320) - Main Deco - Devices, t he Main Deco is a client device of the AT&T Router and the AT&T Router cannot "see" those clients behind Deco due to NAT protection. Upon further investigating, we noticed some special traffic from the client devices triggered the “Home Network Security”, or “Active Armor” on the AT&T router, which is a built-in network protection system that could monitor network flow, detect, and prevent threats. It seemed like something was interfering with the network and we knew it wasn't Deco since it had never been reported before on other services yet. TCP communications (mainly used by all kinds of applications): rejected with TCP RST.ICMP communications (ping command): rejected with Port Unreachable.DNS queries: still good which explains why the Deco units are still green. We will show you how the issue was located by some command lines: This may not happen randomly but is more likely to be triggered by a series of events such as certain devices joining the network, or some special behaviors performed on a specific device. When the issue happens, the main Deco would still stay green. However, all devices connected to the main Deco don’t have internet but devices that are connected to AT&T Router directly or AT&T Wi-Fi still have internet. Network Topology will be like this: AT&T Internet - AT&T Fiber Router (BGW210/BGW320) - Main Deco - Devices We'd like to share how did the engineers work it out and most importantly, we believe this will help others who may experience a similar issue. Occasionally, some customers may report that the client devices failed to access the internet when connecting our Deco to the AT&T modem and luckily with the cooperation of our customers, we are able to locate the problem and find a possible fix for it.
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