T-mobile 5G Home internet and VPN

Appgate SDP Doesnt work.  

I adjusted the mtu with no difference seen.

PS C:\Windows\system32> netsh interface ipv4 show subinterfaces

MTU MediaSenseState Bytes In Bytes Out Interface

------ --------------- --------- --------- -------------

1412 1 0 392484 Loopback Pseudo-Interface 1

1431 2 0 5881 Appgate SDP

1384 1 377343768 245511532 Wi-Fi

1500 5 0 0 Bluetooth Network Connection

1412 5 0 0 Local Area Connection* 9

1412 5 0 0 Local Area Connection* 10

1500 5 0 0 Ethernet 4

1500 5 0 0 Ethernet 2

1500 5 0 0 Ethernet

1412 1 11152 1160080 VMware Network Adapter VMnet1

1412 5 0 0 Talk2m-eCatcher

1356 appears to be the largest packet before fragmentation.

PS C:\Windows\system32> ping thewindowsclub.com -f -l 1356

Pinging thewindowsclub.com [104.26.11.55] with 1356 bytes of data:

Reply from 104.26.11.55: bytes=1356 time=54ms TTL=49

Reply from 104.26.11.55: bytes=1356 time=40ms TTL=49

Reply from 104.26.11.55: bytes=1356 time=48ms TTL=49

Reply from 104.26.11.55: bytes=1356 time=63ms TTL=49

Ping statistics for 104.26.11.55:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 40ms, Maximum = 63ms, Average = 51ms

I set the adapters for 1356.

netsh interface ipv4 set subinterface "Appgate SDP" mtu=1356 store=persistent

netsh interface ipv4 set subinterface "Wi-Fi" mtu=1356 store=persistent

PS C:\Windows\system32> netsh interface ipv4 show subinterfaces

MTU MediaSenseState Bytes In Bytes Out Interface

------ --------------- --------- --------- -------------

1412 1 0 408828 Loopback Pseudo-Interface 1

1356 2 0 5881 Appgate SDP

1356 1 586759110 284827906 Wi-Fi

1500 5 0 0 Bluetooth Network Connection

1412 5 0 0 Local Area Connection* 9

1412 5 0 0 Local Area Connection* 10

1500 5 0 0 Ethernet 4

1500 5 0 0 Ethernet 2

1500 5 0 0 Ethernet

1412 1 11808 1204419 VMware Network Adapter VMnet1

1412 5 0 0 Talk2m-eCatcher

Did not work, I tried smaller MTU sizes, no difference.

I have been reading a lot of messages of T-Mobile home customers having similar VPN problems.

As next steps I am planning to try the following;

1. I am planning to separate the router functions from the t-mobile modem using a dedicated router.
2. Try a different modem that has settable options for beam forming, load balancing and Dual Sim (T-mobile and Google Fi)

Google Fi works with appgate SDP. I cannot use Google Fi exclusively at home because the data cap does not allow enough data for all my home devices for a month. I am hoping I sign up for T-mobile home before they enacted that data cap you talked about back in January.

I read a message from someone that sounded like they were an IT professional. I don't know if they used a sniffer or something more sophisticated. That person claimed the data packets coming from T-mobile were malform. This person was specifically diagnosing appgate data packets.