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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 t
by perlgeek 13y ago
> 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?
- fauigerzigerk 13y agoI'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...
- jlgaddis 13y agoYes, it really is. I can tell where it came from based upon the interface I received it on. Google "BCP38".