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    How easy are we talking here? If it is TCP, they still have to have the response packets routed back to them and not the real IP address holder. Commented Mar 14, 2012 at 15:56
  • @rox0r - its a trival task to spoof an ip address. Commented Mar 14, 2012 at 18:00
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    @Ramhound: its not trivial to spoof an arbitrary IP address and establish TCP connection (esp for ssh with IP address based firewall). You'd need to be able to intercept/reroute packets between the two IP addresses somehow to complete a TCP handshake to your machine. If you control machines at the ISP of legitimate IP/server or are on the legitimate IP/server's local network, its doable (I wouldn't say trivial though). Commented Mar 14, 2012 at 19:29
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    @Ramhound it's trivial to spoof an IP if you're just broadcasting traffic outbound, but if you're going to establish two-way communication, then it falls apart. The return traffic needs to find its way back to you, and that can't happen if you're spoofing an IP that's routed to somewhere else. Commented Mar 16, 2012 at 8:40
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    I think you need to backup your claim that it is easy to spoof an IP. Commented Nov 26, 2015 at 16:04