[nomadking]

Originally Posted by jfman

It’s hardly a punishment. It solves the main concerns in Northern Ireland about security and cross border trade. They’d still live under a Union Flag and UK law. Meanwhile GB can get on with Brexit.

Link

That means that goods coming into Northern Ireland from elsewhere in the UK would need to be checked to see if they meet EU standards.
It would also involve a temporary single customs territory, effectively keeping the whole of the UK in the EU customs union.
These arrangements would apply unless and until both the EU and UK agree they are no longer necessary.