Firewall Security Software - The Basics of a firewall

Firewall

Enterprise companies today employ firewalls that take account of stateful sessions between internal and external host devices. ASA uses a patented algorithm Cisco uses IP source address, destination IP address, TCP sequence numbers, port numbers and TCP flags and prevent unauthorized meetings. The firewall is configured with the statements of the transport through examination of source / destination IP addresses, application filtersport port and protocol before making a decision to allow or deny whether a meeting or specific data.

Firewalls are implemented at the company demilitarized zone (DMZ) between the external network and the company internal network. Static routing is usually configured on the DMZ between the firewall and internal / external router for added security. This is a better control on the propagation of the road are no longer available with dynamic routing protocols like RIPand EIGRP. Internal and DMZ (Public) server is configured to use the firewall as the default route for Internet traffic ahead. If an internal router will be available to the server using the default gateway for Internet traffic at the front.

The external router sends a default route to the firewall that used to be happy for the Internet offers. A line must be at the firewall for each protocol that should be allowed through the firewall to configure. ToFor example, if the company manages routers and servers through a firewall, you need to make a line of traffic for SNMP traps through the firewall. The line is the source address of the router to send SNMP traps, the destination address of the network management station that is receiving SNMP traps, and UDP 161, UDP port for sending SNMP traffic from from devices managed by a management station of the network.

The firewall examines the end to endConnection session and makes a line of its lookup table to determine whether a particular source address, destination port connection protocol or application is allowed through. The packet is discarded or sent to the corporate network (internal) or Internet configured according to the declarations of the line.

TACACS Server

This is a TCP service running on a Unix server call that the staff tries to authenticate an access router. The router mustbe configured to send a request to the TACACS server when someone tries to access a router. The router prompts the user for a username and password and sends them to the server for TACACS authentication. TACACS servers are implemented with VPN services, and approval for the authentication of remote users before the meeting and continue with network authentication, Windows Server, Unix or mainframe authentication.

RADIUS Server

This is a UDPService on a particular network server that staff try to authenticate an access router. The router must be configured to send a request to the RADIUS server if anyone is connected to a router login attempts. The router prompts the user for a username and password and sends them to the RADIUS server for authentication. RADIUS servers are implemented with VPN services and remote users to authenticate before continuing with the session authentication networkWindows Server, Unix or mainframe authentication and authorization.

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