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control connection, or a URL that exceeds a certain size on a web connection: these kinds of classifications require the appliance to examine the payload information in depth Regular expressions You classify traffic based on regular expression strings found in the layer 7 application payloads of packets For example, you might want to look for a URL that begins with http:// and contains ciscocom/ Management Where the other class map types are used for identifying user traffic flowing through the appliance, the management class map is used to classify management traffic to or from the appliance
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When using class maps, you are required to use a layer 3/4 class map to identify the devices and or services, like a particular FTP server Optionally, you can qualify your traffic by using other class maps, like an inspection class map to also look in the payload for a particular regular expression string of a filename or for an FTP command that is being executed NOTE This chapter will primarily focus on layer 3/4 class and policy maps Inspection class maps will be discussed in more depth in subsequent chapters where the various applications are covered with MPF
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Layer 3/4 Class Maps
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Here is the syntax to create a layer 3/4 class map:
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ciscoasa(config)# class-map class_map_name ciscoasa(config-cmap)# description class_map_description ciscoasa(config-cmap)# match any ciscoasa(config-cmap)# match access-list ACL_ID ciscoasa(config-cmap)# match port {tcp | udp} {eq port_# | range port_# port_#} ciscoasa(config-cmap)# match default-inspection-traffic ciscoasa(config-cmap)# match dscp value1 [value2] [] [value8] ciscoasa(config-cmap)# match precedence value1 [value2] [] [value8] ciscoasa(config-cmap)# match rtp start_port_# end_port_# ciscoasa(config-cmap)# match tunnel-group tunnel_group_name ciscoasa(config-cmap)# match flow ip destination-address ciscoasa# show run class-map [class_map_name]
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Use the class-map command to assign a unique name to the class map The match command specifies the traffic to include in the class map, where Table 10-1 explains the parameters for this command
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Match Parameter any access-list port defaultinspectiontraffic dscp precedence rtp
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Description Includes all traffic Includes any traffic that matches the permit parameters in the specified ACL Includes any traffic that matches the specified port number(s) Includes all default application inspection traffic, which is about a dozen-and-a-half protocols Matches on the specified DSCP values in the IP header used for QoS Matches on the specified TOS values in the IP header used for QoS Matches on the range of port numbers used by RTP, which is a protocol commonly used in multimedia applications like Cisco IP/TV and SIP Matches on a particular site-to-site connection or on a WebVPN or IPSec remote access group Further qualifies the matching process when the configured policy is policing: for example, when you re rate-limiting remote access users, without this command, all traffic associated with the user would be rate-limited with the defined policy; with this command, the policy is applied to a user on a per-destination basis
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tunnel-group flow
Table 10-1 The match Command Parameters
NOTE When you re looking for a match, most match commands are XOR (Ored), so if any traffic matches a match command in a class map, it is included in the classification However, in certain cases, it uses an XAND (Anded) process, like match dscp and match tunnel-group would allow you to look for different QoS settings for a particular VPN tunnel in a single class map
Default Class Map
When you boot up an appliance with no configuration, you will find certain default configurations on it One default configuration is for MPF, where a default class map is already configured, shown here:
10:
ciscoasa# show run class-map class-map inspection_default match default-inspection-traffic
Modular Policy Framework
Table 10-2 lists the default inspection protocols/applications, protocols, and source and destination ports the appliance is expecting and inspecting them on N/A indicates any port For example, by default the appliance is expecting the FTP control connection to be
Application/Protocol CTIQBE DCERPC DNS FTP GTP H323 H225 H323 RAS HTTP ICMP ILS IM IPSec Pass-Thru NetBIOS RPC RSH RTSP SIP Skinny (SCCP) SMTP SQL*Net TFTP XDMCP
Protocol TCP TCP UDP TCP UDP TCP UDP TCP ICMP TCP TCP UDP UDP UDP TCP TCP TCP/UDP TCP TCP TCP UDP UDP
Source Port N/A N/A 53 N/A 2123 and 3386 N/A N/A N/A N/A N/A N/A N/A 137 138 111 N/A N/A N/A N/A N/A N/A N/A 177
Destination Port 1748 135 53 21 2123 and 3386 1720 1718 and 1719 80 N/A 389 1 65539 500 N/A 111 514 554 5060 2000 25 1521 69 177
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