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used, Port Address Translation (PAT) will be performed If PAT is used, the single IP address cannot be the outside interface of the PIX This is a change from the behavior of PAT when used with a Cisco router, as we saw in 8 This means that at a minimum three legal IP addresses are required if you are using the PIX to connect to the Internet: one for the PIX outside interface, one for the PAT address, and one for the outside routers' LAN interface When defining the global_ip,both an IP address range and a single IP address can be specified, but only one global statement specifying a PAT address is permitted in the entire configuration In other words, the following is invalid: global (outside) 1 1711015 netmask 2552552550 global (outside) 2 1711016 netmask 2552552550 Only one PAT address can be defined on the PIX The following configuration is legal: global (outside) 1 1711016-17110120 netmask 2552552550 global (outside) 1 1711015 netmask 2552552550 Addresses are used from the global pool first, starting at the highest IP address and working down to the lowest Once all the IP addresses from the global pool have been used, PAT is performed on the single IP address defined When using a single IP address in conjunction with a pool of addresses, the single IP address should be a lower IP address than the lowest IP address in the pool Note in our example that the IP address used for PAT is 5 and the lowest pool address used is 6 The nat command can be used either alone or in conjunction with the global command In most cases, the two commands are used together When used with the global command, the nat command specifies which IP address ranges are allowed to use the global IP addresses defined with the corresponding global command The syntax of the nat command is shown below: nat [(if_name)] nat_id local_ip [netmask[max_conns[em_limit]]] [norandomseq] The if_nameparameter we have seen before Its value is typically the inside interface but could be the third or fourth interface on the PIX The nat and global commands are used when a connection is initiated from a higher security interface to a lower security interface They are not used when connections are required from a lower security interface to a higher one For example, you would not use the nat and global commands to allow connections from the outside interface to the inside interface Returning to Figure 10 5, we would use nat and global commands to connect from dmz1 to either.

15 Once the update of the system is complete, let s verify that the patching of the system prevents the RPC exploit from happening again Go to your Windows XP Professional system and type kaht2 1921681200 1921681201 you should be unsuccessful with this attack (as shown in the following illustration)

Windows server Update services (WsUs)

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This figure shows an internetwork utilizing the addresses reserved by the InterNIC for companies using network address translation to connect to the Internet The backbone uses the Class B network number and the distribution centers use Class C addresses implemented with a 255255255224 subnet mask This gives six subnets, each supporting a maximum of 30 hosts Assuming that a distance vector routing protocol is in use, route summarization means that the distribution center shown will only advertise each Class C network back to the backbone, as the backbone is a different network number Under normal conditions this is okay, because traffic traveling from the head office network to a Class C subnet will take the same path through the backbone until it reaches the distribution center If, however, site A in Fig 7-6 loses its link to the distribution center and dials in to a central pool of dial-up ports, we have a problem We now have two physical connections between the 1721600 network and the 19216810 network In this situation, routers at the head office will have to choose between a route to the 19216810 network via the dial-up port, or through the backbone This is because the routing tables in the head office routers will accept only whole network number for networks that are not directly connected What ends up happening is that whichever of the two routes to 19316810 has the lowest metric is the one that gets entered in the head office routing tables, and the other route to the 19316810 network will never get traffic If this network numbering scheme is chosen, distributed dial-up port pools are the only option If the whole internetwork was based on the one Class A or Class B network, appropriately subnetted, either central or distributed dial-up port pools would work This is because all sites are on the same major network number and subnet mask information is utilized throughout the internetwork to identify where individual subnets are physically attached.

Running Windows Update on one system is no problem, but what if you have to manage 500 systems and ensure that each system is up-to-date with current patches and hot-fixes Microsoft has created Windows Server Update Services (WSUS), which allows you to create a WSUS server and download the updates from the Internet to the WSUS server You can then test the installation of those updates to some test systems to verify that the updates do not conflict with any applications on the systems; then you can send the update out to the 500 systems When you send the updates to the 500 systems on the network, you can do it from a central point the WSUS server The WSUS server has a web-based management tool that allows you to manually approve updates Those updates are downloaded to the WSUS server Within WSUS you can create groups of computers and then send the updates out to the different groups on the network An update that you have not approved will not be sent to the systems on the network Figure shows a WSUS structure

.

11:

figUre 11-5

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