Kittiphan Techakittiroj (21/05/58 10:00 น. 21/05/58 10:00 น. 21/05/58 10:00 น.) Firewall Kittiphan Techakittiroj

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Presentation transcript:

Kittiphan Techakittiroj (21/05/58 10:00 น. 21/05/58 10:00 น. 21/05/58 10:00 น.) Firewall Kittiphan Techakittiroj

Kittiphan Techakittiroj (21/05/58 10:00 น. 21/05/58 10:00 น. 21/05/58 10:00 น.) Firewall Isolate two side of network –trusted & untrusted network Work on higher layer –not physical Hardware/Software

Kittiphan Techakittiroj (21/05/58 10:00 น. 21/05/58 10:00 น. 21/05/58 10:00 น.) Characteristic of Firewall Service Control: –TCP/IP e.g. , ftp, http or UDP dns Direction Control –for web-browsing, the initiate from inside to outside –for web-server, the initiate from outside to inside User Control Behavior Control –spam Firewall

Kittiphan Techakittiroj (21/05/58 10:00 น. 21/05/58 10:00 น. 21/05/58 10:00 น.) Firewall cannot protect! Attacks that bypass the firewall –inside network containing dial-in or dial-out Attacks from inside –two employee attack each other Attacks that embedded in seem-to-be-secure message –virus inside the –trojan horse from the download file Firewall

Kittiphan Techakittiroj (21/05/58 10:00 น. 21/05/58 10:00 น. 21/05/58 10:00 น.) Category of Firewalls Packet-Filtering –mostly embedded inside the router –transparent Application-Level Gateway –mostly a dedicated computer Circuit-Level Gateway Bastion Host Firewall

Kittiphan Techakittiroj (21/05/58 10:00 น. 21/05/58 10:00 น. 21/05/58 10:00 น.) Packet Filtering Filter out the prohibit traffic Usually on layer 3 & 4 –IP number: allow & prohibit, source & destination IP –TCP port number: allow & prohibit e.g. #21 for FTP, #23 for telnet, #25 for (SMTP), #80 for world wide web –Separate Interface Policy e.g From HCNL to BTL, but not from BTL to AUNet Firewall

Kittiphan Techakittiroj (21/05/58 10:00 น. 21/05/58 10:00 น. 21/05/58 10:00 น.) Packet Filtering cont. Transparent for the allow service Standard Configuration –dual homed: hosting two network card –screening router Firewall

Kittiphan Techakittiroj (21/05/58 10:00 น. 21/05/58 10:00 น. 21/05/58 10:00 น.) Application-Level Gateway Proxy server, acts as a relay of application traffic Application Specific –web proxy, telnet proxy Require high computational power Firewall

Kittiphan Techakittiroj (21/05/58 10:00 น. 21/05/58 10:00 น. 21/05/58 10:00 น.) Circuit-Level Gateway Look like proxy server, but connection oriented If “A” want to talk to “B”, then “A” open connection to “firewall” and “firewall” open connection to “B”. Firewall

Kittiphan Techakittiroj (21/05/58 10:00 น. 21/05/58 10:00 น. 21/05/58 10:00 น.) Bastion Server Server act like a gateway Some server reqiured authentication Can be configured to support the specific security needed. Firewall

Kittiphan Techakittiroj (21/05/58 10:00 น. 21/05/58 10:00 น. 21/05/58 10:00 น.) Reference Books Cyrptography and Network Security by William Stallings (Prentice Hall: 2003) Internet Firewall Tutorial: A White Paper (RPAnetwork: July 2002) Developing Secure Commerce Applications by Online O’Reilly Web Development Courses ( 1999) Client/Server Survival Guide by Robert Orfali, Dan Harkey, Jeri Edwards (John Wiley & Sons: 1999)