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VPN on TMobile home 5G internet calyx (sh.itjust.works)

submitted 10 months ago by [email protected] to c/[email protected]

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I have calyx hotspot/ tmobile home internet. Ive been having issues with my work Palo Alto Global Protect VPN and tailscale. Neither of them seem to stay connected. They will work for a bit after I reboot my modem. I am using the glinet spitz 5g modem. Any tips for band, MTU, or APN for better experience?

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[–] [email protected] 2 points 10 months ago* (last edited 10 months ago) (1 children)

I’ve had intermittent issues with T-Mobile on hotspot too. I’m not sure how helpful this will be but here’s my 2 cents. The only params I played with that seemed to help were the :

1- MTU (if I remember correctly, I had to dial it down to 1300)

2- and using IPv6 instead of v4.

This will depend on the APN you’re using for T-Mobile. I believe they have a legacy one that only uses IPv4 whereas their new one supports IPv6 only (I wasn’t able to find clear info about this but this is my guess). In any case, I have my wireguard server setup to support and use both IP versions and when v4 doesn’t work for me, switching to v6 fixes the issue for a while. At some point I even suspected they were heavily throttling wireguard traffic, which may be the case but who knows.

I hope this helps, good luck!

[–] [email protected] 1 points 10 months ago

Enabled ip6v seems to have helped with the tailscale. As for my works GlobalProtect VPN its 50/50 if it will work. I found an article on Palo Altos website about changing the MTU on the headend. I put in the change request at work to add this to our portal options