You should not already have those IP addresses in your network space:
$ ping 192.168.0.1
PING 192.168.0.1 (192.168.0.1): 56 data bytes
ping: sendto: Network is unreachable
ping: wrote 192.168.0.1 64 chars, ret=-1
--- 192.168.0.1 ping statistics ---
1 packets transmitted, 0 packets received, 100% packet loss
$ ping 192.168.0.2
PING 192.168.0.2 (192.168.0.2): 56 data bytes
ping: sendto: Network is unreachable
ping: wrote 192.168.0.2 64 chars, ret=-1
--- 192.168.0.2 ping statistics ---
1 packets transmitted, 0 packets received, 100% packet loss
If those commands don't give you errors, change the names or the
addresses.
You can choose other addresses, names or netmask (netmask must be the
same on both sides). In the rest of this document, I'll suppose you
choose these addresses and these names.