[SpamCop-Geeks] Re: How is this IP addy possible?

[YoKenny]

"Simon Matthews" <simon> wrote in message
news:3B97C03A.5176D403
> Jonathon,
>
> No, I'm sorry, you are not correct here.
>
> A computer can send out a packet with any source address, and unless the
> ISP is filtering outgoing packets (unlikely), it will be delivered to the
> destination address.-- however, if the source address is wrong, it will
not
> receive any replies.
>
> There are various levels of difficulty in sending out a packet with such a
> source address, depending on the OS. Most *nix OSes allow aliases IP
> addresses: one ethernet port can have multiple IP addresses, making it
very
> easy to sned out such packets.
>
> NT4, W2k and WinXP have TCP/IP stacks that allow raw sockets. Raw sockets
> can be used to send out packets with fake source addresses.

For a good disiscussion of Raw sockets go to:
http://grc.com/dos/sockettome.htm  and news.grc.com newsgroups
grc.sockettome (closed),  grc.spoofarino

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YoKenny
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