Try to write rules as general as possible. For example, although there are only two nodes outside, try to write rules such that the policy is achieved even if there were more than two nodes outside.
Given the following topology of a network where the router connecting the two subnets together, Nodes 1 and 2 are ’inside’ of the subnet neta, Nodes 4 and 5 are ’outside’ of neta and Node 3 with a firewall is the gateway of neta.
Try to write rules as general as possible. For example, although there are only two nodes outside, try to write rules such that the policy is achieved even if there were more than two nodes outside.
Suppose the default policy is ACCEPT in the firewall on Node 3. Write
packet filtering rules for the following goals (each of which is treated separately):
Rule 1. Block ping (icmp) packets being forwarded between the two subnets; Rule 2. Block ping packets coming into the firewall;
Rule 3. Prevent Node1 from SSHing to any outside nodes;
Change the default policy as DROP and write packet filtering rules for the following golas: Rule 4. Allow inside hosts can access outside websites;
Rule 5. Allow outside hosts can SSH into Node1. No other access should be allowed.
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