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Wingy
on June 11, 2020
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A Facebook crawler was making 7M requests per day ...
IP packets have a source field, which can be fake and not their actual IP. That's a Facebook IP, but the packet might not have actually come from it.
detaro
on June 11, 2020
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If they made actual requests that went through, a connection got established. That won't happen with a faked source.
Wingy
on June 12, 2020
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Ah okay, thanks for helping me learn :)
lgats
on June 12, 2020
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Could be the IP address OP is showing is actually from an X-Forwarded header or other proxy header (but not the actual source of the packet).
thephyber
on June 11, 2020
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UDP packets can fake their source IP. TCP packets realistically can't.
hinkley
on June 11, 2020
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More precisely, spoofing a TCP handshake is a problem that we know how to prevent. Odds are pretty good that your kernel has these protections enabled by default, but it's not guaranteed and you should check as a matter of due diligence.
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