In network network protocols, source routing is the capability whereby the sender can specify the route a packet should take.
Analogy: Somebody asks you how to get to the freeway. You can give them two responses:
1).
You tell them to drive a little further on, and there will be signs pointing to the freeway. You tell them just to follow the signs. This is normal routing,you simply hand the packet off to the routers, and let them worry about which direction the packet takes.
2).
You tell them to drive up 3 blocks, turn left, then go 2 blocks, then turn right, then go one more block and bear left onto the onramp. This is source routing: you tell the packet every hop it should take through the network.
Key point: The hacker can give the packets routes that go around firewalls. From Hacking-Lexicon
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