Hello everyone,

I'm reaching out to the community as I'm experiencing difficulties with my MikroTik RB750Gr3 router. To be transparent, I'm not a networking expert, and I haven't performed the usual thorough checks.

My issue is as follows: when I connect the router to my fiberbox as a router, the Internet connection doesn't seem to work. However, if I configure the MikroTik as a bridge, everything seems to work fine. With my limited understanding of networks, I prefer to seek your expertise to guide me through this process. If someone could provide step-by-step guidance or offer advice on specific configurations to check, it would be greatly appreciated.

Here's my configuration:

MikroTik RB750Gr3
Fiberbox (Internet Service Provider)
Thank you in advance for your valuable assistance.

When i read this, i get a feeling of that your isp only lease out only one ip.
So when you tries to test your router, your public isp ip has already been leased out to your computer.

So how to get this working, you have to release the ip from from what equipment that have the ip.

With Windows computer you can try to just run cmd as administrator and run command ipconfig /release and when disconnect the cable and connect the cable to the router.