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Additional info for CSPFA PIX Firewall Coursebook
Deny Does not allow a packet to travel through the PIX Firewall. By default, the PIX Firewall denies all inbound packets unless you specifically permit access. permit Selects a packet to travel through the PIX Firewall. protocol Name or number of an IP protocol. src_addr Address of the network or host from which the packet is being sent. src_mask Netmask address of the source address. operator Specifies a port or a port range. port Services you permit to be used while accessing src_addr or dest_addr.
With WebSENSE, organizations can guard against user downtime caused by employees surfing sites that are not work-related and misusing network resources. • WebSENSE works on Windows NT and Solaris. © 2000, Cisco Systems, Inc. 0—3- 16 WebSENSE is software that provides integrated, URL filtering for the PIX Firewall, giving network administrators the ability to effectively monitor and control network traffic. WebSENSE is used to block specific URLs because the PIX Firewall cannot. WebSENSE determines whether to block or permit specific URLs based on its configuration and the Master Database.
0 Information systems © 2000, Cisco Systems, Inc. 01—2- 21 The PIX Firewall PAT feature expands an address pool: One outside IP address is used for approximately 4,000 inside hosts (the practical limit is 4,000, and the theoretical limit is greater than 64,000) Maps TCP port numbers to a single IP address Hides the inside source address by using single IP address from the PIX Firewall PAT can be used with NAT A PAT address is a virtual address, different from the outside address Do not use PAT when running multimedia applications through the PIX Firewall.