Our IT services firm is proposing a network reconfiguration to use the IP range 10.10.150.1 – 10.10.150.254 internally as they state the current IP scheme using manufacturer defaults of 192.168.1.x is "making it to easy to exploit".
Is this true? How does knowing / not knowing the internal IP scheme make a network more exploitable? All internal systems are behind a SonicWall NAT and firewall router.