Yuichiro Tateiwa

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Firewalls are one of the most deployed mechanisms to protect the network from unauthorized access and security threats. However, maintenance of firewall policy is an error-prone and complicated task for a dynamic network environment. Conflict is a misconfiguration that happens when a packet matches two or more filters resulting in shadowing and redundancy(More)
Packet filtering provides initial layer of security based upon set of ordered filters called firewall policies. It examines the network packets and decides whether to accept or deny them. But when a packet matches two or more filters conflicts arise. Due to the conflicts, some filters are never executed and some filters are occasionally executed. It may(More)
Firewalls are one of the most common mechanisms used to protect the network from unauthorized access and security threats. Nowadays, time-based firewall policies are widely in use in many firewalls such as CISCO ACLs and Linux iptables to control network traffic with respect to time. However, network administrators struggle to maintain the firewall policies(More)
Firewalls use packet filtering to either accept or deny packets on the basis of a set of predefined rules called filters. The firewall forms the initial layer of defense and protects the network from unauthorized access. However, maintaining firewall policies is always an error prone task, because the policies are highly complex. Conflict is a(More)
When performing network construction exercises, a number of beginners fail to satisfy the requirements for the network reachability of communication data. In helping these learners, instructors explain the errors in the behavior of the learners' networks; such errors are referred to as behavior errors. Because of limitations on the number of network(More)
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