hmw6-solutions.pdf - ECE470 Homework Assignment#6 Solutions...

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ECE470 Homework Assignment #6 Solutions Problem 1. NAT operations. An enterprise has a private network with 16,000 addresses. The enterprise’s ISP assigns it public network 9.0.0.0/x. 1. Determine, if possible, a class A private network that will accommodate the enterprise addressing needs. 2. Determine, if possible, a class B private network that will accommodate the enterprise addressing needs. 3. Determine, if possible, a class C private network that will accommodate the enterprise addressing needs. 4. Determine the smallest appropriate value for x, assuming no PAT. 5. Determine the largest appropriate value for x. 6. Suppose that static NAT is used. Show the contents of the address translation table. 7. Suppose that static NAT is used. Calculate the savings in (public) address space. 8. Suppose that dynamic NAT is used, with a pool of 1,000 public addresses. Show the contents of the address translation table. 9. Suppose that dynamic NAT is used, with a pool of 1,000 public addresses. Calculate the savings in (public) address space. 10. Consider the network shown in Figure 1. Figure 1: The network in Problem 1. Show one of each of the following addresses: inside local, inside global, outside local, outside global, inside private, inside public, outside private, outside public. Solution Note that 16,000 addresses will require 14 bits in the host part of the IP address. This leaves 18 bits for the network ID + subnet ID parts. 1. Any 10.0.0.0/x class A network, where x = 18 , 17 , . . . , 8 , will accommodate the enterprise’s private ad- dressing needs. As an example, 10.0.192.0/18 and (10.0. 11 00 0000.0/18) and 10.0.128.0/18 (10.0. 10 00 0000.0/18) are two such networks. 1
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2. Recall that the range of class B private network IDs is 172.16.0.0 172.31.0.0, where the host part of the IP address is 16 bits. Any 172.16.0.0/x class B network, where x = 18 , 17 , 16 will accommodate the enterprise’s private addressing needs.
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