Restrict Local Administrators from change Network property

In my office Environment we are using Development machines on which every developer has Local Administrator rights on there system. We are using 2 Internet lines in which one line is fast speed and another one is slow one, due to slow internet speed on second line some peoples manually change the Gateway IP and switch from slow to Fast one, to stop this we need to restrict those users from changing IP on windows 7. Only domain Administrator can able to change that Setting. we are using Window Server 2008 R2 as ADDS. is there any way to stop this using domain group Policy? or Local security policy?