Cisco 7604 Configuration Guide - Page 687
Addresses, Protocols, and Ports, IPv4 Addresses and Subnet Masks
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E A P P E N D I X Addresses, Protocols, and Ports This appendix provides a quick reference for IP addresses, protocols, and applications. This appendix includes the following sections: • IPv4 Addresses and Subnet Masks, page E-1 • IPv6 Addresses, page E-5 • Protocols and Applications, page E-11 • TCP and UDP Ports, page E-11 • Local Ports and Protocols, page E-14 • ICMP Types, page E-15 IPv4 Addresses and Subnet Masks This section describes how to use IPv4 addresses with FWSM. An IPv4 address is a 32-bit number written in dotted-decimal notation: four 8-bit fields (octets) converted from binary to decimal numbers, separated by dots. The first part of an IP address identifies the network on which the host resides, while the second part identifies the particular host on the given network. The network number field is called the network prefix. All hosts on a given network share the same network prefix but must have a unique host number. In classful IP, the class of the address determines the boundary between the network prefix and the host number. This section includes the following topics: • Classes, page E-2 • Private Networks, page E-2 • Subnet Masks, page E-2 OL-20748-01 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM E-1
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