I was able to solve my VPN issues using the guidance in https://amithkumarg.medium.com/resolved-t-mobile-home-internet-vpn-issue-2f5ca594c23e. This was on a MacBook + Cisco AnyConnect. I don’t think I needed to change all of them, but I set the MTU on four network adapters to 1350:en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1350utun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1350utun1: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1350utun2: flags=80d1<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1350Assuming this is something that can be fixed at the router level, I really hope T-Mobile pays attention to this thread. Not every user is going to be tech savvy enough to do this on their own.
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