@ChrisBS 

Firmware Version: 1.2.3 Build 20260127 rel.53303(4555)
Hardware Version: Archer BE550 v1.0

Hello,

I am using the Archer BE550 behind a 5G outdoor router (ZTE MC7010) in a Double NAT setup.

I originally tried using the ZTE in bridge mode, but due to issues with lease renewals and cell changes on my ISP's 5G SA network, the BE550 frequently lost connectivity. The Internet status changed to " ! " and only a complete power cycle restored the connection. A normal reboot of the BE550 did not help.

After switching to Double NAT, the connection has become much more stable. However, I am still experiencing another issue:

The " ! " Internet indicator frequently starts blinking, especially when there is little or no Internet traffic because most devices are in standby mode.

The strange thing is that:

• Internet access continues to work normally.
• DNS resolution works.
• VPN connections (WireGuard server running on the BE550) continue to work.
• Clients can browse websites without any issues.

The blinking " ! " usually disappears again after a few seconds, sometimes after 20–30 seconds.

Because of this behavior, it looks as if the BE550 is performing some kind of internal connectivity test (ping, DNS check, cloud check, etc.) and temporarily considers the connection degraded, even though Internet connectivity remains fully operational.

My main concerns are:

1. The event log provides almost no useful information for troubleshooting.
2. There is no indication of what exactly caused the warning state.
3. There is no option to disable or adjust the connectivity monitoring behavior.

It would be very helpful if future firmware versions could provide:

• Detailed connectivity diagnostics in the system log
  • Connectivity check failed
  • DNS lookup failed
  • Ping timeout
  • Gateway unreachable
• Information about which target was tested
• An option to disable or customize the connectivity monitoring
• Less aggressive warning behavior on mobile/5G WAN connections where latency and packet loss can occasionally occur

At the moment the blinking " ! " often indicates a problem even though the Internet connection, DNS and VPN services continue to work normally.

While the " ! " indicator is blinking:

• Ping to 1.1.1.1 succeeds with 0% packet loss.
• DNS resolution works correctly.
• Web browsing works.
• WireGuard VPN connections remain operational.

Therefore the blinking indicator does not appear to represent a real Internet outage.

Has anyone else observed this behavior on the BE550?

If there is no possibility to implement this functions then it would be nice to HIDE the blinking " ! " .

Thank you.

Thank you for the suggestion.

I understand that AP mode could help determine whether the issue is related to the router's WAN/NAT functionality.
 

However, my primary concern is that the BE550 is being used specifically as a router with WireGuard, DHCP reservations, DNS redirection and IoT isolation. These functions are unavailable in AP mode.

In addition, I have already observed cases where Internet access was lost behind the BE550 while a laptop connected directly to the upstream ZTE MC7010 modem had full Internet connectivity. Reconnecting the WAN cable to the BE550 immediately restored operation.

Therefore, I am more concerned about a possible issue within the BE550's WAN processing, routing engine or connectivity monitoring mechanism rather than the Internet status indicator itself.

My network is intentionally configured with strict segmentation and access controls. The BE550 operates in a different IP range than the ZTE modem, and the ZTE's DHCP scope is restricted to a very small number of addresses, with the BE550 being the primary device using that scope. Therefore, DHCP interactions between the two devices should not be causing the issue.

I have also observed different behaviors of the "!" indicator:
 

• In most cases, the "!" indicator blinks for a few seconds (sometimes up to 20–30 seconds) while Internet access, DNS resolution and WireGuard connectivity continue to function normally.
• In some cases, the "!" indicator starts blinking and connectivity is lost completely. During these events I am sometimes unable to access either the BE550 or the ZTE until connectivity recovers.
• When the "!" indicator remains permanently illuminated, this has typically corresponded to an actual problem on the upstream side, such as the ZTE modem itself requiring recovery.

For additional context, when the ZTE was configured in Bridge Mode, I experienced frequent WAN disconnections on the BE550. In those cases, a normal reboot of the router did not restore connectivity and a complete power cycle of the BE550 was required.

I can try AP mode when I have time and report back my findings. However, due to the complexity of my current setup, the test requires significant preparation and does not reflect the production environment in which the issue occurs.

Thank you for your assistance.