Oubound traffic requires the proxy services of bastion host. It is responsible for filtering traffic coming into the private network as well as for protecting the identity of the internal system.Įxternal systems can access only the bastion host (and its proxying capacities to internal systems) and possibly information servers in the screened subnet.
Packet filtering internal router, connecting the screened subnet to the intranetīastion host acts as a proxy for the trusted systems within the private network.Bastion or screened host, located in the screened subnet.Packet filtering outside router, connecting the internet and the screened subnet.The dual firewall consists of three devices: This figure shows a network using a single firewall: three-ledged networkĪ multi-homed firewall has three interfaces, one pointing the internet, the second a screened subnet and a third the intranet. As a single multi-homed firewall, a.k.a.The screened subnet architecture can be designed: In this scenario, the firewall(s) separate(s) 3 distinct zones: It blocks or filters the traffic between these networks.ĭual-homed firewall is a restrictive form of a screened-host firewall.Ī screened subnet is a special-purpose extranet. The firewall has two or more network interfaces, each of which is connected to a different network. Depending on security configuration and policy, hosts may access internet directly or use proxy services on the bastion host.Īn intruder has to penetrate two separate systems before the securitoy of the private network can be compromised.ĭual-homed host architecture, is also known as bastion host. In this case, the inside hosts reside on the same network as the bastion host. The packet filtering router has a set of rules configured that allow inboud traffic to access only the bastion host, which blocks access to internal system.
Screened host architecture consists of two elements They are explained in further detail below. There are these main firewall architectures: In some cases, it restricts the information to some specific users. It acts as an intranet for the private network but also serves information to outsider or external entities.
The services are placed on internal servers.Īn extranet is a cross between the internet and an intranet. The internet is publicly available for any user.Īn intranet hosts information privately only for users within an organization. According to its privacy, there are different types of network segments:
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