Create a loopback on R3 with 192.168.3.1/24. Configure NAT translation on R3 for this network to be translated to interface IP address with overload. You should be able to ping anywhere in the network from R3 sourcing from this loopback and get NATed to the corresponding egress interface.
Configure R1 clock polling from NTP server R2. All NTP packets should be encrypted. Update the system.
Configure R3 to report the BGP configuration to Network Management System 192.168.6.99 (NATed 10.50.31.99). Configure the appropriate static/ACL on the PIX to achieve this task.
There is a mail server ...