Firewall In Linux Assignment
- Country :
Australia
Task C:
Firewall (45 marks)
The node R3 is the firewall for the talos network. Configure the Firewall service on this node to satisfy the following requirements:
- Allow traffic from anywhere to DMZ for the provided service by each server. This must be limited to only the public service that a server provides: dns only DNS, web only HTTP, mail only SMTP
- Allow servers in DMZ to initiate a communication if it is required by the service the server provides and only for that service (stateful inspection: DMZ-External).
- Allow internal hosts to access all services provided by servers in the DMZ (stateful inspection: Internal DMZ) This includes all services that DMZ servers provide. You can be more permissive here and use address ranges and all IP traffic. All servers in DMZ run SSH service which you can use to test your rules for the internal subnets,
- Allow internal hosts to reach other internal hosts (if the traffic passes through R3), All traffic is allowed if it is internal to internal.
- Allow internal nodes to access external servers, however packets from external to intemal are only allowed if they are responses to communications that were initiated from inside (stateful inspection: Internal External)
- Allow the nodes in client's subnet of tales to ssh to node R: (any host connected to the R1 eth0 subnet),
- Allow the node R3 to send and receive ICMP echo messages to internal nodes and DMZ servers
- All other traffic must be dropped (see notes below)
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