Problem with EoIP Tunnel - Websites not working

Hi

Im having a problem with a network that is connected via EoIP tunnel to another router on my network (Server-Client use required by a costumer).Now, the problem is very simple, Internet suddenly doesnt work. This didnt happenned earlier, and nothing was changed on the tunnel since the problem and before that.

What i cant manage to understand is the next :

-Google searchs work properly
-Youtube works properly (but videos wont load)
-DNS resolves if i ping to a website from the network with the problem
-tracert completes the whole path
-ping responds as if there is no problem

No special firewall rules and nothing strange that might be affecting that i can find

Now, what i dont understand is why only Google and Youtube searchs works and the rest of the internet wont. Any Ideas ? (on the other hand i can confirm that the tunnel is actually working because the path on tracert is how it should be)

Maybe a MTU issue.

try and add mangle rule that changes the mss of the tcp-syn packets to something below 1500.

I had the same issue after replacing a ccr1036 with a 1072, changing the mss to 1418 solved the issue.

Or a TCP/MSS issue.