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TRANSPARENT FIREWALL EXAMPLE CONFIGURATION
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Now that I ve introduced the concepts of the transparent firewall feature, let s look at an example configuration to see how it s implemented I ll use the example shown previously in Figure 21-2 for this configuration, where I ll assume VLAN 10 is the non-trusted side and VLAN 20 is the trusted side Also, I ll use an ASA 5510, with one physical interface connected to the switch, which will use 8021Q trunking The users should be allowed to open any HTTP, FTP, DNS, SMTP, or ICMP connection ICMP won t be configured as stateful, so for ICMP traffic from the campus network, the ICMP replies will have to be allowed back through the appliance Here s the ASA 5510 configuration:
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myasa# show firewall Firewall mode: Router myasa(config)# firewall transparent ciscoasa(config)# show firewall Firewall mode: Transparent ciscoasa(config)# interface e0/0 ciscoasa(config-if)# no shutdown ciscoasa(config-if)# exit ciscoasa(config)# interface e0/010 ciscoasa(config-subif)# vlan 10
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ciscoasa(config-subif)# nameif outside ciscoasa(config-subif)# security-level 0 ciscoasa(config-subif)# exit ciscoasa(config)# interface e0/020 ciscoasa(config-subif)# vlan 20 ciscoasa(config-subif)# nameif inside ciscoasa(config-subif)# security-level 100 ciscoasa(config-subif)# exit ciscoasa(config)# ip address 1001253 2552552550 ciscoasa(config)# access-list ACLoutside permit icmp any any ciscoasa(config)# access-list ACLoutside permit tcp any any eq ciscoasa(config)# access-list ACLoutside permit tcp any any eq ciscoasa(config)# access-list ACLoutside permit tcp any any eq ciscoasa(config)# access-list ACLoutside permit udp any any eq ciscoasa(config)# access-list ACLoutside deny ip any any ciscoasa(config)# access-group ACLoutside in interface outside
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In the preceding example, I enabled transparent mode I then set up e0/0 with trunking, along with the two VLANs, 10 and 20 The management IP address I assigned was 1001253 I then set up an ACL to allow the users in VLAN 10 to access campus network resources in or beyond VLAN 20 TIP In real life, I would be as specific as possible about what is and isn t allowed from the users to the campus network My recommendation in a campus situation is to primarily rely on CTP with downloadable ACLs to restrict users access versus static ACL entries on the appliance: this gives you more flexibility and scalability when implementing your policies
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Cisco ASA Configuration
his chapter will introduce you to the concept of contexts and the advantages they give you in deploying a wide diversity of security policies The topics in this chapter include Introducing contexts, including their uses and components Switching to multiple mode and setting up contexts Managing your contexts
CONTEXT OVERVIEW
A context is basically a virtual firewall; however, contexts are not the same as VMware with VMware, you can have multiple operating systems running on the same computer With contexts, each context uses the same operating system and ASDM image However, each context can have its own security policies and its own set of administrators to manage the context The following sections will introduce the licensing, use, restrictions, and implementation of contexts
Licensing
Not every security appliance supports contexts The PIX 515 and higher and the ASA 5510 and higher support contexts And for the appliances that do support contexts, you get two contexts for free by default; if you want more contexts, you ll have to buy the appropriate license There are four license levels for purchasing security contexts 5, 10, 20, and 50 as well as upgrade licenses to upgrade from one number to another With the 5510, you need the Security Plus license to use contexts, and the 5510 supports a maximum of five contexts The 5520 supports a maximum of 20 contexts, and the higher-end ASAs support up to 50 contexts The PIX 515 and 515E support up to 5 contexts, and the 525 and 535 support up to 50 contexts I discuss how to upgrade the license key on the appliances in 26
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