FIREWALLS By Seferash B Asfa Wossen Strayer University

FIREWALLS By Seferash B Asfa Wossen Strayer University 3 rd December 2003 2/5/2022 1

Firewall products offer IP Address Filtering n n n 2/5/2022 Firewall provides a filter that incoming or outgoing packet must pass through. It perform some sort of accept or reject functionality These filtering firewall products can take many forms. The product may be a independent operating system written with Internet security as the main object. 2

Topics of Discussion n n 2/5/2022 There application-specific firewall products that only offer protection for certain types of Internet Connectivity They are SMTP or HTTP There also hardware-based products. Allowing to set filters for incoming and outgoing connections 3

Topic One n n n 2/5/2022 All firewall products offer IP address filtering. These filters work by examining the header of the IP packet and making pass/fail decisions This type of filtering can provide very basic protection mechanism for a simple LAN (Local Area Network) 4

Topic Two n n n 2/5/2022 It allows you to set your filters so that no incoming traffic from the Internet can access any ports only the ones you want. Since TCP/IP is a peer-to-peer protocol, each node has a unique address. Only solution is to build bidirectional filters into your firewall 5

Topic Three n n n 2/5/2022 There a few problems to identify. They are as follows We would not know what port numbers the servers that we are trying to access are running Hacker may compiled their own network invasion tool to succeed getting through you connection. 6

Real Life n 2/5/2022 Firewall blocks any inbound IP packets that do not have TCP source port numbers that match specific services such as WWW (World Wide Web) 7

What This Means n n 2/5/2022 Firewalls alone will not secure your network. In order, to secure corporate network you need to apply the following Security policies which influence two levels of network policy. They are Installation and Use of a system Firewall improves network security and reduces risks to servers by filtering insecure services 8

Next Steps n The main components in building firewall are: Policy, Advanced authentication, packet filtering and application gateways – 2/5/2022 9