I'm new at computer networking and trying to understand traceroute by this tutorial:
These are IP packets with a UDP transport packets with a TTL ( time to live ) set to 1. The reason they are sent to one is that once they reach the next hop IP, the packets will expire sending a Time Exceeded message back to the host that sent them.
So if I understand this correctly when TTL=1 then my home router which is the first hop decreases it to 0 and send it to the second router which is my isps gateway which will generate the first Time Exceed message that's how I know it's a hop on the route.
What I don't understand is how do I get the address of the very first router (which is my home router) when the TTL is 1?