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ciscoasa(config)# snmp-map snmp_map_name ciscoasa(config-snmp-map)# deny version version
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The version number can be 1, 2, 2c, or 3 To deny multiple versions, list them in separate deny commands SNMP inspection is disabled by default Once you ve created your SNMP map, you need to reference it in a layer 3/4 policy:
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ciscoasa(config)# policy-map L3/4_policy_map_name ciscoasa(config-pmap)# class L3/4_class_map_name ciscoasa(config-pmap-c)# [no] inspect snmp snmp_map_name
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To help illustrate how to configure SNMP inspection with SNMP maps, examine the following configuration:
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ciscoasa(config)# access-list snmpACL permit tcp any any eq 161 ciscoasa(config)# access-list snmpACL permit tcp any any eq 162 ciscoasa(config)# class-map L3_snmp ciscoasa(config-cmap)# match access-list snmpACL ciscoasa(config)# snmp-map deny_snmp_map ciscoasa(config-snmp-map)# deny version 1 ciscoasa(config-snmp-map)# deny version 2 ciscoasa(config-snmp-map)# deny version 2c ciscoasa(config)# policy-map global_policy ciscoasa(config-pmap)# class L3_SNMP ciscoasa(config-pmap-c)# inspect snmp deny_snmp_map ciscoasa(config)# service-policy global_policy global
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In the preceding configuration, an SNMP policy is enabled globally, where only SNMP version 3 is allowed
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Oracle developed a protocol called SQL*Net, which allows remote users to access an Oracle database in client/server applications There are two version of SQL*Net: version 1 and 2 The Cisco application inspection feature is compatible with both In the following sections, I will discuss how the application inspection feature for SQL*Net works and how to enable SQL*Net application inspection
Mechanics of SQL*Net Connections
Before I begin talking about how the appliance application inspection feature deals with connectivity issues between Oracle clients and Oracle database server(s), let s first look at how connections get set up between these two sets of devices Basically two different scenarios can occur when an Oracle client requests a connection to an Oracle database server: The connection will be created to the specified database server The database server will redirect the client to a database on a different server
I ll use the example shown in Figure 12-4 to assist with my explanation of the first type of connection In this example, the Oracle client opens a TCP connection to the Oracle database server The source port number is greater than 1023, and the destination port number is 1521 If the database server is IANA compliant, then the destination port
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SQL*Net Connection to the Same Server TCP Port => 1024 TCP Port => 1024 Oracle Client TCP Port = 1521 TCP Port => 1024 Oracle Database Server
Figure 12-4 This is how a SQL*Net connection is set up to the same database server
number should be 66 The database server, upon receiving the connection setup request, completes the connection and then notifies the client that to establish a data connection to do a table query, the client should use the TCP port number assigned by the server The client then opens a second TCP connection to the server: the source port number is above 1023, and the destination port number is the one assigned by the Oracle server An interesting situation arises, however, when the actual data resources that the client wants are not on the same Oracle database server, or when load balancing is set up among multiple database servers In this instance, the client connects to its configured server on TCP port 1521 (or 66), as shown in Figure 12-5 Once this connection is established,
SQL*Net Connection to a Different Server
TC 102 4
t= Por
Oracle Database Server #1
P TC TCP Port => 1024
TCP Port => 1024 Oracle Client
t Por
TCP Port = 1521 TCP Port => 1024 Oracle Database Server #2
Figure 12-5 This is how a SQL*Net connection is set up to a different database server
12:
Data Applications and Policies
if this database server will not be handling the data requests, it will forward the IP address of another database server back to the SQL*Net client The client will then tear down the connection to the first server and will use the IP address given to it by the first server to set up another TCP port 1521 (or 66) connection this is the connection to the redirected database server This second server will then negotiate the TCP port numbers for the data connection, which the client will then use to establish the data connection The function of application inspection on the appliance is to dynamically add these connections to the conn table as needed, including any connections to other database servers Likewise, if the appliance is performing address translation and the port numbers (or addresses) negotiated conflict with what is already in the xlate table, the appliance will fix the numbers in the payload and add the necessary entry in the xlate table If the port number being passed back matches a static command between the two interfaces, the appliance will also fix this in the payload
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