Peer-to-peer clarification

(I know Unity doesn't support peer-to-peer, but..)

I'm a bit confused about how peer-to-peer in a RTS game is handled this at a more detailed level (using lockstep). For example when player A moves a unit:

- A sends a message to players B, C, D, which each acknowledge that they recieved it.
- B sends a message to C, D that it recieved it. (and all other peers do the same)
- So no peer will perform the step unless it has recieved the Ack from all other peers.

But... because it's peer-to-peer, each peer will have varying pings to eachtoher. Even if A has a 50ms ping to B C, B might have a 2000ms ping to C. So what happens if A recieved the Ack from all peers, it knows all other clients have recieved it so it will execute the command on the specified tick. Yet the routing between players B C is 2000ms, so player B C are waiting for the ack from eachother, but player A doesn't know this.

So you can end up in a situation where
- A has Ack from B, C, D. (will run the tick)
- B has Ack from A, D but not C
- C has Ack from A, D but not B
- D has Ack from A, B, C. (will run the tick)