# IPSEC/L2TP thru GL-X3000 not working on 5G NSR carrier **URL:** \ **Category:** Router\ **Created:** [August 18, 2024, 4:00pm UTC](https://forum.gl-inet.com/t/ipsec-l2tp-thru-gl-x3000-not-working-on-5g-nsr-carrier/46044 "2024-08-18T16:00:56Z")\ **Posts on this page:** 1\ **Showing post:** 14
**Author:** ![SpitzAX3000](https://forum-assets.gl-inet.com/user_avatar/forum.gl-inet.com/spitzax3000/32/11018_2.png) [@SpitzAX3000](https://forum.gl-inet.com/u/SpitzAX3000)\ **Post date:** [August 19, 2024, 7:41pm UTC](https://forum.gl-inet.com/t/ipsec-l2tp-thru-gl-x3000-not-working-on-5g-nsr-carrier/46044/14 "2024-08-19T19:41:17Z")
> [@HoxCa](#): > > Yes for sure i have the Port 4500 as this is the default UDP-Encap for ESP But I see 5500 on your screenshot only ? > [@HoxCa](#): > > I'm not sure how i can do band white listing. > Did you mean something in the 'lock tower' feature ? No. It’s called band masking… like this: > [@X-3000 Lock to 5G towers](https://forum.gl-inet.com/t/x-3000-lock-to-5g-towers/44544): > > I am on vodaphone Germany, and my connection sometimes flips from 5g to LTE in the middle of streaming of video chat, causing severe latency/lag. I am trying to block the LTE bands using the 'masking' feature: I have also tried the "Lock Tower" button to lock to a 5G tower, and I get the same result. If I lock to a 5G tower, the SIM card won't register. However, whenever I mask the LTE band, my SIM card is no longer able to register on the network. Is there a way to mask the LTE b… --- _[View the full topic](https://forum.gl-inet.com/t/ipsec-l2tp-thru-gl-x3000-not-working-on-5g-nsr-carrier/46044)._