X750 - LTE disconnect - 4G+ not working - VPN not reconnect - mullvad DNS

Technical Support for Routers
1

Hi,

I own a GL-x750 EP06 with SIM Free Mobile (france), which uses :

  • LTE B3 (1800 Mhz)
  • LTE B7 (2600 Mhz)
  • LTE B28 (700 Mhz)
    Antenna is near 200 meters from me, so I have good reception.

I had many connection problems, so I installed testing firmware : openwrt-x750-3.027-0821.bin

  1. I have problem with LTE to aggregate channels.
    Modem randomly goes to 4G, then 4G+, then 4G, then 4G+ …
    I very rarely reach 70 mbits (4G with aggregation) because 90% of time I reach 24 mbits (4G without aggregation)
    Why can’t I stay always on 4G+ ? I tried to aggregate manually B3+B7, B3+B28, B7+B28 : it’s always the same thing.

  2. I have disconnection randomly during the day, minimum 1 per day. Why can’t I stay connected ?

  3. I use Wireguard. When LTE disconnects, Wireguard disconnects and never reconnects ! I need to do it manually ! It should try to reconnect ?

Other comments :

  1. When we go to admin interface, password input doesn’t have focus. You should add autofocus parameters (HTML input autofocus Attribute)
  2. With mullvad wireguard auto-setting, you use the old DNS server (Our public DNS is changing - Blog | Mullvad VPN)
  3. (Not sure you can do something, but I needed to add MTU 1300 to have internet)
  4. Some words are mistranslated in french.
  5. Wireguard auto-setting can’t configure multi-hop. It could be a nice feature.

Question :

  1. Do you do QOS before Wireguard ? I mean QOS in local network before Wireguard and internet ? For exemple better priority to video. Less priority to torrent.

Thanks for reading me,
Best regards.

2

In fact, the 4G+ mode is determined by both the modem and the base station, so there is no way to force aggregation.
You can click Cells info on the WEB UI to get information about the surrounding base stations. If PSS and SSS appear in the list of base stations, it means that the aggregation conditions are met

If you are sure your signal is good, it may be related to the carrier, because some carriers update IP every day

This may be a BUG, I will try this afternoon

Here are some good suggestions. We’ll consider them. Thank you very much

We have no plan to do it for the time being, and we will consider whether development is needed or not according to the needs of users in the future

Best,regards

3

I tested the previous 3.009 with this problem, but I tested the 3.027 BUG and it disappeared

4

I tested these two firmware :

  • firmware/x750/testing/openwrt-x750-3.027-0821.bin
  • firmware/x750/release/openwrt-x750-3.027.bin

Both didn’t reconnect me after LTE disconnection :frowning:

Icon before « Client Wireguard » becomes yellow.

And for aggregation problem. Yes I can see PSS and SSS. But after some seconds it disappears, then appears again, then disappears …

5

If you manually disconnect LTE and then manually connect, can the wireguard reconnect?

What are the RSSI,SINR,RSRP,RSRQ parameters for PSS and SSS?

6

=> no same problem, I need to disconnect wireguard then reconnect.

[
{
“type”: “PSS”,
“freq”: “3350”,
“band”: “LTE BAND 7”,
“bandwidth”: “20M”,
“state”: “Registered”,
“pcid”: “275”,
“rsrp”: “-104”,
“rsrq”: “-10”,
“rssi”: “-71”,
“sinr”: “9”
},
{
“type”: “SSS”,
“freq”: “1675”,
“band”: “LTE BAND 3”,
“bandwidth”: “15M”,
“state”: “deactivated”,
“pcid”: “275”,
“rsrp”: “-98”,
“rsrq”: “-9”,
“rssi”: “-81”,
“sinr”: “0”
},
{
“type”: “servingcell”,
“state”: “NOCONN”,
“mode”: “FDD”,
“mcc”: “208”,
“mnc”: “15”,
“cellid”: “643E93F”,
“pcid”: “275”,
“earfcn”: “3350”,
“band”: “7”,
“ul_bandwidth”: “20M”,
“dl_bandwidth”: “20M”,
“tac”: “BBB”,
“rsrp”: “-104”,
“rsrq”: “-11”,
“rssi”: “-71”,
“sinr”: “15”,
“srxlev”: “-”,
“rat”: “LTE”
},
{
“type”: “neighbourcell”,
“earfcn”: “3350”,
“cellid|pcid”: “275”,
“rat”: “LTE”
},
{
“type”: “neighbourcell”,
“earfcn”: “3350”,
“cellid|pcid”: “274”,
“rat”: “LTE”
},
{
“type”: “neighbourcell”,
“earfcn”: “3350”,
“cellid|pcid”: “261”,
“rat”: “LTE”
},
{
“type”: “neighbourcell”,
“earfcn”: “9460”,
“cellid|pcid”: “-”,
“rat”: “LTE”
},
{
“type”: “neighbourcell”,
“earfcn”: “1675”,
“cellid|pcid”: “275”,
“rat”: “LTE”
},
{
“type”: “neighbourcell”,
“earfcn”: “1675”,
“cellid|pcid”: “274”,
“rat”: “LTE”
},
{
“type”: “neighbourcell”,
“earfcn”: “1675”,
“cellid|pcid”: “261”,
“rat”: “LTE”
}
]

7

I’m sure I have no problem with this method. Which wireguard do you use?

Looks like you’ve got a lot of interference

8

sinr is 0 because SSS is deactivated. When SSS is activated I have sinr 6 or 8.

I put x750 in another room. I have now sinr 20 for PSS and sinr 0 or 18 for SSS.

Problem is still present. PSS + SSS appears, then disappears, then appears …

I have tried separately every bands I can use. 4G works well.

I know I can reach 70 mbits with aggregation because I already did it ! Yet, very rarerly … I am less than 200 m from the antenna. So quality signal should not be a problem.

For wireguard, I use Mullvad with x750 autoconfig.
I only changed these values :

  • DNS because default was the old one
  • MTU 1300 because half packets were drop
  • TTL 0 or 25 didn’t change anything