Option 015 should be defined on all your DHCP servers. Should is the operative word, whether or not it is, only your DHCP Admin can say for sure. The bad news is that if you have something hard-coded on the computers, the DHCP option will not override it. You need to blank out the hard-coded setting. You may ask why not then just hard-code the new setting. Not a good idea if it were ever to change again. Better to rely on option 015.
Is there not a way with NetSH to blank out the settings?
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