Roundabout, circuitous, deviating from the direct or ordinary route.
Cunning or deceiving, not straightforward or honest, not frank.
Something or someone reliable or dependable
Suitable or fit to be relied on; worthy of dependence, reliance or trust; dependable, trustworthy
Such that either a sent packet will reach its destination, even if it requires retransmission, or the sender will be told that it didn't