Once configuring internet sharing, I know the target network adapter for internet sharing will be configured to 192.168.2.1 IP Address. However like in earlier versions of Mac OS X and all other computer OS, user can change it to the other IP address range (e.g. 192.168.13.1, ...). It is ok to set the gateway address to 192.168.13.1 and the dns address to 192.168.2.1 on the internet shared computer. However, if I change the IP address range, internet sharing does not work any more. Internet sharing works only using 192.168.2.1 IP address. It is obviously a bug. It was in DP3 and still remains in DP4.