Yes, sub-letting your internet connection is usually against terms and conditions - unless a) you own the second house, or b) you often visit the second house and want to use your laptop there on your own network, or c) you want to use it at the bottom of your garden which is closer to the other house than your own, and d) you only use it yourself, and not give access to others.
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@ Link Two Houses ?!
Yes, sub-letting your internet connection is usually against terms and conditions - unless a) you own the second house, or b) you often visit the second house and want to use your laptop there on your own network, or c) you want to use it at the bottom of your garden which is closer to the other house than your own, and d) you only use it yourself, and not give access to others.