Relayed Tunnels


I have a few people in my network with CUnite, but some of the clients get connected with relayed tunnels. Those clients have a hard time playing in my minecraft server. The problem is that they don’t receive a lot of updates, I think this is because the bandwidth is very very low. I don’t know what to do with this because when I used Hamachi, clients with relayed tunnels could still play, even though they had a terrible ping.
I’ve heard that allowing the ports on the router’s firewall could help, but I can’t access the router.
What can I do?



 Relay connection always has a big delay so it's not suitable for transferring real time data.
 You mean contact to people who get relay connection to set their router firewall so they could get direct connection.