Hi Hishiryo,
The gw-config command can only be used on the "gateway" client in a Gateway type Hamachi network. It appears your client is not a "gateway" which is why you are seeing that error message.
This command is used to configure the IP range, from which the "gateway" client will chose an IP for (and give to) "member" clients in the same Gateway type Hamachi network. It is needed only when there is no DHCP server on the LAN, where the "gateway" client resides, and the IP addresses of the computers are configured manually. When DHCP server is present the "gateway" client can reserve IP address for each "member" clients from the DHCP server.
