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Physical layer security is concerned with securing physical access to internetwork devices A subsequent section in this chapter will show you how to determine the Enable password, or see the router's entire configuration, if physical access can be gained to the device The simple rule is that all live routers on an internetwork should be kept in a safe place, with only authorized individuals able to gain access to the rooms in which they are located Once data is routed out of one of your routers and onto a telephone company's network, you no longer can guarantee the physical security of the data you are transporting Although rare, it is possible for intruders to passively listen to the traffic transmitted on selected cables in the phone company system This is a minimal risk, as there are generally more fruitful ways to get physical access to interesting data Generally the greatest security risks come from Internet and dial-in connections If you follow the PIX guidelines for Internet connections and the CHAP and TACACS guidelines for dial-in connections, you will be protected
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This section illustrates the use of two configuration options for Cisco routers that do not fall neatly in to any other section Both IP unnumbered and data compression, useful when building an internetwork, are explained fully here
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IP unnumbered has been explained in overview previously The first benefit of IP unnumbered is that it allows you to save on IP address space This is particularly important if you are using InterNIC-assigned addresses on your internetwork The second benefit is that any interface configured as IP unnumbered can communicate with any other interface configured as IP unnumbered, and we need not worry about either interface being on the same subnet as the interface to which it is connected This will be important when we design a dial backup solution The concept behind IP unnumbered is that you do not have to assign a whole subnet to a point-topoint connection Serial ports on a router can "borrow" an IP address from another interface for communication over point-to-point links This concept is best explored by using the three-router lab we put together earlier The only change to the router setup is that router 1 and router 2 now are connected via their serial ports, as shown in Fig 7-15
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Figure 7-15: Lab configuration of IP unnumbered investigation with working route updates
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With the IP addressing scheme shown in Fig 7-15, effectively one major network number with two subnets, the route information about subnets is maintained, as we can see by looking at the routing table on router 2 and router 3 Router2>show ip route 120000 255255255224 is subnetted, 2 subnets I1201132 [100/8576] via 1201133, 00:00:42, serial1
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C120110 is directly connected, serial 0 Router3>show ip route 120000 255255255224 is subnetted, 2 subnets C1201132 is directly connected, ethernet 0 I120110 [100/10476] via 120112 00:00:19, serial1 This routing table shows us that router 3 has successfully learned about the 120110 subnet from Serial 1, which is being announced from router 2 with the source address 120112 This is as we would expect, as the Serial 1 interface on router 2 is borrowing the address from its Serial 0 interface If the Serial 1 interfaces on both routers had their own addressing, we would expect the routing table in router 3 to indicate that it had learned of the 120110 subnet from the address of the Serial 1 interface on router 2, not the borrowed one IP unnumbered is easy to break: Just change the address of the Ethernet interface on router 3 to 1931133 and see what happens, as illustrated in Fig 7-16
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Figure 7-16: Lab configuration for IP unnumbered investigation with nonworking route updates
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To speed the process of the routing table in router 2 adapting to the change in topology, issue the reload command when in privileged mode After router 2 has completed its reload, try to ping 120112 from router 3 The ping fails, so let's look at the routing table of router 3 Router3>show ip route 120000 255255255224 is subnetted, 1 subnets I120110 [100/10476] via 120112, 00:00:18, serial 1 193110 255255255224 is subnetted, 1 subnets C1931132 is directly connected, Ethernet 0
Everything here appears to be fine, so let's examine the routing table of router 2 to see if we can determine the problem Router2>show ip route 120000 255255255224 is subnetted, 1 subnets C120110 is directly connected, serial 0 193110 is variably subnetted, 2 subnets, 2 masks I193110 2552552550 [100/8576] via 1931133 00:01:15, serial 1 I1931132 255255255255 [100/8576] via 1931133 00:01:15, serial 1 Straight away, the words variably subnetted should make you aware that something is wrong From the discussion on IGRP in Chap 4, we know that IGRP does not handle variable-length subnet masks properly, so any variable-length subnetting is likely to cause us problems Looking more closely, we see that router 2 is treating 1931132 as a host address, because it assigned a netmask of 255255255255 to that address Treating 1931132 this way means that there is no entry for the 1931132 subnet, and therefore no way to reach 1931133 The reason behind all this is that subnet information is not transported across major network number boundaries and an IP unnumbered link is treated in a similar way to a boundary between two major network numbers So router 3 will advertise the 1931132 subnet to router 2, which is not expecting subnet information; it is expecting only major network information, so it treats 1931132 as a host A simple rule by which to remember this is that the network numbers on either side of an IP unnumbered link can use netmasks only if they belong to the same major network number
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