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ciscoasa/ctx1(config)# service-policy outside_policy interface outside ciscoasa/ctx1(config)# service-policy inside_policy interface inside ciscoasa/ctx1(config)# changeto context ctx2 <--output omitted-->
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In the preceding example, four virtual sensors are on the IPS card The top part of the configuration shows the configuration in the system area, where I m allocating the virtual sensors to their respective contexts In the policy for ctx1 in the outside_map1 class map, notice that since I didn t specify a virtual sensor name, the default virtual sensor is used, which is the mapped name of ips1 (mapped to vs0 in the system area) I have two policies for ctx1: traffic on the inside interface is processed with promiscuous mode using vs1, and outside interface traffic is processed in inline mode using inline mode using vs0 I ve omitted the configuration of ctx2, but the command structure is basically the same
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As I mentioned in 1, there are two CSC-SSM cards, the model 10 and 20 Table 25-1 summarizes the cards and the licenses The base license only allows you to perform antivirus, antispyware, and file blocking The plus license adds anti-phishing, antispam, URL blocking and filtering, and content control The licenses are based on number of users, so you need to ensure that you buy the right card and license based on the number of IP addresses you want the card to process NOTE The CSC-SSM supports up to 120 Mbps of traffic that can flow through it before it will start dropping packets
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Traffic and the CSC Card
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The CSC-SSM card was designed to examine only certain protocols to protect against viruses, spyware, spam, phishing attacks, and unwanted files and content The protocols supported include FTP (TCP port 21), HTTP (TCP port 80), POP3 (TCP port 110), and SMTP (TCP port 25) You can scan traffic for all these protocols or a combination of them
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Table 25-1 CSC-SSM Cards
25:
SSM Cards
However, because of the limited throughput of the card and its processing capabilities, you should only divert the traffic you need the card to examine In other words, don t forward protocols like ICMP or SIP which the card can t scan NOTE When you define a policy for the CSC card, the policy is bi-directional This means that if traffic matches the policy on either an inbound interface or an outbound interface where there is a CSC policy, the traffic will be redirected into the card for further processing
Forwarding Traffic to the CSC-SSM Card
By default the card processes no traffic unless you set up an MPF policy to forward matching packets to the card You must define an MPF policy containing the csc command to determine which traffic will be forwarded into the card This process was discussed in 10 Here are the commands you need:
ciscoasa(config)# policy-map policy_map_name ciscoasa(config-pmap)# class class_map_name ciscoasa(config-pmap-c)# csc {fail-open | fail-close}
For more information on the preceding commands, see 10 TIP When setting up a class map for CSC traffic inspection, I recommend that you use an ACL to match on only the protocols the card supports To illustrate the configuration of a CSC policy for the ASAs, examine the network shown in Figure 25-2 In this example, all internal users traffic that is HTTP, SMTP, and POP3 should be examined by the card; the exception to this is web traffic to the DMZ web server Also, e-mail traffic sent to the e-mail server from the outside should be examined Here s the configuration to accomplish this policy:
ciscoasa(config)# access-list csc_out deny tcp 19216830 2552552550 host 19216826 eq 80 ciscoasa(config)# access-list csc_out permit tcp 19216830 2552552550 any eq 80 ciscoasa(config)# access-list csc_out permit tcp 19216830 2552552550 any eq 110 ciscoasa(config)# class-map csc_outbound_class ciscoasa(config-cmap)# match access-list csc_out ciscoasa(config-cmap)# exit ciscoasa(config)# policy-map csc_out_policy ciscoasa(config-pmap)# class csc_outbound_class
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