You don't have to worry about it. MMR Boosting bans are not given out just because you played with a different IP. What would be suspicious is if your behavior drastically changed at the same time your IP does.
https://support.riotgames.com/hc/en-us/articles/204168430-MMR-Boosting-Detection
LEGITIMATE PLAY PATTERNS ARE OK
Before we get to the overview of our detection process, let’s first examine some variables that we always keep in mind when digging deeper into MMR Boosting cases. We know that play styles and environments are different for each player, and these things can vary from game to game. To account for these situations, we consider a wide variety of factors in our process to ensure we are making accurate decisions. We can identify and account for these sorts of circumstances:
Relocation (semester abroad, family moves, etc.)
Play from a friend’s computer
PC Cafes and LANs
Good coaching from your challenger level buddy
Trying a new build
Trying a new champion
Experimenting with key bindings
Going on tilt
Keep in mind that we are committed to not punishing anyone unless we have 100% certainty that MMR Boosting is occurring.
Also, if you are traveling due to military deployment, be careful of logging in onto public computers to play (PC cafes); they can have keyloggers that record your account info, though it'd be a bit paranoid to think it's common. Don't let the client save your info though.