(Solved) URGENT something is blocking my LAN network

RouterOS General
1

Hi,
From nothing something is blocking my lan network, we didn’t move anything and can’t connect to my customers routers. I added a firewall filter rule to free everything and didn’t work.

Can somebody helpme remotelly please.

I can connect to everything without any problem, RB, CPEs, VPN, Switches, just my lan network is blocked. Restart the RB, upgrade version and nothing work.

Solution:

The problem was that all my network is bridged. Only at the end we put a router, could be TP-Link or airgateway.
One of the airgateways was cloning our router’s gateway and was creating an arp cycle or loop (something like that).
Thanks for the help to @CelticComms and we could locate the error. So, we blocked the client’s CPE that has the airgateway and our network is back.

Best regards to everyone.

2

Is the LAN interface showing an active link? Does torch show any activity?

3

Thank for your reply.
Yes, ether1 is active, and torch show some activity. some clients can navigate, if a restart the router other clients navgite is something randome.

This happened from one minute to another. Allready restarted the router, reset to default configuration and restore yesterday backup.

4

Any unusual CPU load or WAN load? Any pattern connecting those who can connect and those who cannot?

5

No, CPU is perfect 0 to 3%, WAN is working like a charm. Is like if a have a filter rule blocking that network.
Can you help me via teamviewer?

I cleared DNS cache, rebooted all CPEs, tried everything.