Chapter 2 VLANs. CHAPTER 2 VLANs
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1 [ 52 ] Chapter 2 Beginning in Version 6.2 of the PIX firewall, there is support for subinterfaces, trunk links, and. The PIX and ASA can support 802.1q encapsulation and a number of logical interfaces depending on the platform. This enables you to scale your perimeter security solution without the cost of additional hardware. For instance, I have had many clients in the past with a three-interface firewall configuration (inside, outside, DMZ). DMZ VLAN 50 Inside Outside
2 [ 53 ] The problem that lies here is that all the web services are hosted on the same subnet, and while filtering is being performed between the outside and the DMZ, there is no filtering within the DMZ. Suppose a security breach occurs on your web server through a web application vulnerability. After the web server has been compromised, it has unrestricted access to the other hosts on the DMZ. The mail server can now be compromised using an exploit against ports that would have been off limits, such as 135, 139, 445. In addition, servers and network devices that were previously inaccessible from the Internet can now be attacked from the compromised host. Through the use of subinterfaces and, we can now segregate our DMZ servers and apply different security policies to each server or each group depending on your configuration. We can take control over what traffic, if any, will pass between these servers. DMZ VLAN 25 VLAN 50 VLAN 75 Inside Outside
3 [ 54 ] To configure a subinterface from the command line, simply enter the interface command followed by the interface, including a fractional decimal value: ASA5510(config)# interface ethernet 0/0.1 Within the interface configuration mode, assign additional parameters, such as logical name, IP address, security level, and VLAN: ASA5510# config t ASA5510(config)# int e0/2.1 ASA5510(config-subif)# vlan 25 ASA5510(config-subif)# security-level 25 ASA5510(config-subif)# nameif web ASA5510(config-subif)# ip address ASA5510(config)# int e0/2.2 ASA5510(config-subif)# vlan 50 ASA5510(config-subif)# security-level 50 ASA5510(config-subif)# nameif mail ASA5510(config-subif)# ip address ASA5510(config)# int e0/2.1 ASA5510(config-subif)# vlan 75 ASA5510(config-subif)# security-level 75 ASA5510(config-subif)# nameif DNS ASA5510(config-subif)# ip address After configuring the interface, you configure NAT rules and access control lists (ACLs) and apply these the same way that you do when using physical interfaces.
4 [ 55 ] Routing Information Protocol The security appliances have support for dynamic routing protocols. As you may know, Routing Information Protocol (RIP) is a distance-vector routing protocol that is supported by the majority of network devices. The ASA can support RIP Version 1 and Version 2. You can run RIP v1, v2, both v1 and v2 on the same interface or different interfaces at the same time. You can enable RIP from the command line with the router rip command. RIP can also be enabled from the Cisco Adaptive Security Device Manager (ASDM) from the following location: Configuration > Routing > RIP > Setup. From this screen, RIP can be enabled, interfaces can be set to passive if necessary, and network statements can be added. In this case, I have configured the outside interface.
5 [ 56 ] As you should know, one of RIP v2 s improvements over v1 is the support for authentication. Although authentication of routing protocols is a best practice that makes lots of sense to me, I have found that it is not used the majority of the time in production networks. If this is something that is under your control, invest the small amount of time required to secure your routing tables. You can configure authentication on a per-interface basis. To enable authentication of RIP, navigate to Configuration > Device Setup > Routing > RIP > Interface. On this screen, select an interface, and then click Edit.
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