The forward plane is only responsible for packet forwarding in the network. Responsibility is divided between both the planes. It emphasises the separation of the network and the control plane. Software defined networking (SDN) is the new network technology. Figure 1: SDN architecture Figure 2: SDN layer architecture It can also perform deep packet scrutiny for higher layer parameters (like application type and services, etc) to filter network traffic.įirewalls are an essential component of any secure network communication for bi-directional packet flow. The system analyses data packets for parameters like layer2 or layer3 switch packet formats. Software based firewalls provide a layer of software on a host, which controls network traffic in and out of that particular machine. Firewall appliances may also provide other functionality to the internal network they protect, such as acting as DHCP or VPN servers for that network. Network firewalls are software programs running on different hardware appliances in the network. ![]() Firewalls typically maintain a barricade between a confidential, protected internal network and another outside network, such as the Internet, which is assumed not to be secure or trusted. They can be categorised as either hardware or software firewalls.
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