New router. Cannot access certain websites?

RouterOS Beginner Basics
1

Hello,
I got new hap ac router. I thought I have configured it correctly but It seems I cannot access certain websites.
Maybe its the famous MTU/MSS problem, but I am unable to solve it.
I am connected to Internet thru Ethernet cable (UTP) and I receive my IP by DHCP.
No PPPoE or other tunnels. With my previous router everything is fine.

I am looking for help to solve this annoying issue.
Thanks.

2

I found out what the problem is. It was not the MTU.

it was this port forwarding rule was working for the internal network too.
chain=dstnat action=dst-nat to-addresses=192.168.0.63 to-ports=80 protocol=tcp dst-port=80 log=no log-prefix=“”
I guess i need to specify dst-address=my_external_ip too and in-interface=ether1 too?
What is the correct syntax for port forwarding?

3

It’s enough