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#11
As far as I know, you would need default gateway access. Since he did say that it is not allowed to access the default gateway, access would require unethical methods. Since that is illegal as mentioned, default gateway access cannot be obtained legally, thus you wouldn't be able to change any IP configuration (Default Gateway Address + the IP assigned). I don't think manually changing your IP address will work, it would require the router to assign static addresses. You could try asking them if they could change it.