Session Hi-jack Testing

So I've been doing a lot of different security testing exercises and was wanting to get in some better session hijacking practice than the very stripped down labs that we used in my CEH course. I was wondering if it is illegal to perform a session hi-jacking attack against your own session with a third party. My immediate thoughts were, "its my session that i'm hi-jacking so...no harm, no foul." But its obviously a grey area, just given the fact that there is a third party involved. So just curious if anyone knows if this actually is illegal. Thanks.
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Actually, there is no formal agreement of terms between myself and my ISP. I use public internet that is supplied by my complex (i know I am going to have stones hurled at me for admitting this is in the security certifications forums). I would purchase my own internet, but I'm hitting way faster speeds (more than double) with their free wireless than I ever did with my $90 "high-speed" Comcast.
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Just because it's free does not mean there are no terms associated with it. There are always terms and conditions.
You can set up your own lab to do what you're asking though no need to go out to the internet.
Websites usually have a terms of service. ISPs have similar provisions. To be sure, ask your lawyer, understanding that laws also vary from location to location. Otherwise, I'd practice in your own lab network. Also keep in mind you are not the owner on the complex's network and there's the potential that if your session hijacking could affect your neighbours in any way, that could get you into technical / legal hot water.
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