barcode in excel 2010 free Configuring the PIX Firewall in Software

Creating DataMatrix in Software Configuring the PIX Firewall

Configuring the PIX Firewall
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As mentioned, for your initial configuration it is recommended that you establish a basic firewall setup and verify connectivity before moving on to a more detailed configuration based on your network requirements Following are the steps for basic firewall setup 1Specify the types of interfaces installed on your PIX Firewall The default configuration of the PIX Firewall uses the term hardware_id to describe the interface on which it resides Replace the default label hardware_id with more descriptive labels for your interfaces Typically, ethernet0 or tokenring0 is used to describe the external network, and ethernet1 or tokenring1 is used to describe the internal network For Ethernet, use the auto keyword when you have 10/100 auto-sensing NICs, and use 10baseT when you have strictly 10 Mbps cards For Token Ring, use 4mbps or 16mbps Here are examples of the configuration commands for 10/100 auto-sensing Ethernet NICs: pixfirewall#interface ethernet0 auto pixfirewall#interface ethernet1 auto 2Assign IP addresses to the network interface cards (NICs) IP addresses for the internal and external interface must be on separate networks The internal address can use nonregistered IP addresses since these can be hidden from the external world If the external address exists on a public infrastructure, it must use a registered IP address Following are examples of the configuration commands used to assign IP addresses to the interfaces Notice the first two commands entered to get to interface configuration mode pixfirewall#configure terminal pixfirewall(config)#interface ethernet0 pixfirewall(config-int)#ip address inside 10111 2552552550 pixfirewall(config-int)#exit pixfirewall(config)#interface ethernet1 pixfirewall(config-int)#ip address outside 18919821110 2552552550 3Allow all internal users (on the private network) to start outbound connections using Network Address Translation (NAT)
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To enable users to initiate outbound connections using Cisco Network Address Translation (NAT), explained earlier in the chapter, you must configure a NAT statement This NAT statement will take all the IP addresses specified (or all IP addresses if 0000 is used) and translate them to the addresses in the global statement that follows the NAT statement (step 4) The NAT statement and the global statement are linked together by the group number found in both of the commands, right before the IP addresses Here is an example of a NAT statement allowing all IP addresses to initiate outbound connections using NAT: pixfirewall(config)#nat (inside) 1 0000 4Create a pool of addresses that are used by internal users for connecting to external services This step goes hand in hand with the preceding NAT specification step The NAT command states that address translation will take place for this group of users on this side of the PIX Firewall, and the global command states which IP addresses are going to be used Port Address Translation (PAT), discussed in a previous section, is also an option It can be deployed in two ways: Enter only one IP address in the global command, and PAT will be used for every IP address that is defined in the preceding NAT command Enter the range of NAT addresses to be used in the global command; then enter an additional global command with only one IP address This configuration works when you would like to do NAT but have limited IP addresses You set up NAT for as many IP addresses as you want to use, saving one for the global PAT command As users are connected and their addresses are translated, they will use the IP addresses from the first global pool Once those IP addresses are used up, any remaining connections will use PAT For this arrangement, make sure the range of IP addresses is first in the configuration Otherwise, PAT will be applied to all connections using the single IP address, and the range of IP addresses you designated won't be utilized Following is an example of a global command referring to group one of the previous NAT statements; here we use a range of IP addresses (NAT) versus one IP address (PAT) Instead of all outbound connections having the same source IP address (18919821110), outbound connections will pull an available IP address from the pool (189198211225-250) This global command allows all internal IP addresses from the step 3 NAT statement to initiate outbound connections by using an IP address from the range defined: pixfirewall(config)#global (outside) 1 189198211225-189198211250 5Assign default routes to the inside and outside of network interfaces Assuming you are not running Routing Internet Protocol (RIP) and the routers aren't set up to share the routes with the PIX Firewall, you need to set up default routes for each interface Here are the commands to do that: pixfirewall(config)#route inside 10113 2552552550 pixfirewall(config)#route outside 18919821111 2552552550 The first command sets the default route for the internal interface to send everything to the internal default router The second command sets the default route for the external interface to send everything to the external default router 6Write the current configuration to memory Of course, once you're done with any type of configuration, you write it to Flash memory to save it This command is the same as for any other Cisco network device and is shown here: pixfirewall#write memory
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