Creating dedicated server & important UDP ports not reachable

[Swarmachine]

Hello community ,
To be short ,
i trying to run dedicated server on external-IP (from external people could join dedicated server) with router ZYXEL NBG-418N v2.

Computer network IPv4 (Local) settings are established as (Preferred).
Checked firewall ,but in this case firewall does not have effect , disabled or not , port forwarded (in firewall) or no.


This is my configuration of my router (port forwarded)

From other server TCP responds fine

but not UDP:

i have talked with my ISP , last reply was
"problems may be due to a router (unlikely) or due to computer configuration.Your router is accessible through an external IP, so with Port Forwarding everything is in order, but it's not clear why you can not access them from the outside by directing them to your computer."

So basically my main question is "Do i have in this case , buy new router or i have do some configuration somewhere else ?"
if wouldnt be any resort , currently i have in mind - TP-LINK TL-WR841N

 

[_Cosmin_]

Just set that ip into DMZ and then will have all ports open (without need for portforwarding).

 

[Swarmachine]

Just set that ip into DMZ and then will have all ports open (without need for portforwarding).

First of all thanks for first opinion!

Second my router dosent support dmz mode (ISP was connected to my router and tryed to open Ports for Me.)

(Could some one tell at least one cheapest router for today?)

As more I think about it , it's seems the only way is to buy new router ?

By the way I got zyxel from my isp then I bought from them network connection for additional price.