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Authenticate someone by ip, how safe is it?

jimkat
jimkat asked
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Last Modified: 2010-04-11
Hi I have a script on a web server that is accepting xml from certain ip's that I approve. How easy is it for somone to spoof one of my approved ip's and send me unauthorized data? Is there some way that I can check that they are really sending from that ip?
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as bloemkool1980 indicated, one can easily spoof an IP address BUT it's a one way street, they can send you packets but never get an answer. TCP/IP requires a three-way handshake to establish a connection, you can't just send a steam of packets as with UDP.
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