From the ttl section of the spec:
The ttl
field will be a u8 and will contain the hop limit for the packet. Each relay will decrement this counter before retransmission; if it reaches 0, the relay will instead set the error flag and send the packet back toward the originating node. If a relay receives a packet with the error flag active, it will increment the ttl
field before retransmitting back toward the originating node; if it hits 255, the packet will be dropped.
Packet schemas that do not use the ttl
field will be ineligible for packet switching beyond a single hop: if the relay cannot immediately deliver the packet to the intended recipient, it will respond by returning the packet to the originator with the error flag set.
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