STC FTTH MODEM SECURITY

dears,

i am using STC FTTH service with huawei modem. i am giving connection to some people. but the problem is they are extending my internet line to other/secondary  router and sharing connection with other who i dont give..  can anyone tell me the security option to block secondary routers. does mac filter help ?

Change the password of your Huawei modem

I would recommend you should Change the password  if the problem persist you can go for MAC filtering, It is a better option to overcome secondary sharing and unwanted users.

changing modem/wifi password does not help on this.. They take wired connection from me then they connect it to secondary wifi router.

Thanks bro,

does mac filter block the secondary router and allow PC user  which is connected from that secondary router?

Limit data sharing.