Can you 'fake' an IP address?

[Thomas Milne]

This is a quote from an article about this Pierre Poutine business:

"When he went back and analyzed the data on that server, he realized
that the person who’d uploaded the fake calls had used a phony IP
address. But when that user signed off, Meier told me, he left behind
a tell-tale “cookie”, which left a trail of what you might call
digital cookie crumbs, that led, in turn, to the real IP address."

I swear I had read in discussions on here before that it was
impossible to 'fake' an IP address. You could hide behind someone
elses, ie. use a zombie or proxy or something, but in the end your IP
is your IP, right?

-- 
Thomas Milne
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