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> an ISP can easily block packets that originate in its network but have a source address that's not part of its own IP range.

Is it really so easy? How does the ISP know that the package came from within its network?



I'm not an expert on this at all, but I think that unless an ISP's customer is allowed to run a public facing router it would be trivial for the ISP to determine that. There simply cannot be any legit packets with a source address from outside its address range arriving at inward facing network interfaces. Maybe I'm not getting something here...


Yes, it really is. I can tell where it came from based upon the interface I received it on. Google "BCP38".




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