[m_eiman]

There’s Multipath TCP.

[KaiserPro]

I mean there is, but from what I recall its more a link aggregation thing, rather than a network portable system

[gmokki]

It seems to support failover smoothly over various links.

Interesting article about combining starlinks, 4G + 5G to single mptcp that works on the move: https://dillonbaird.io/articles/mptcpbonding/