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CS 350

CS 350. Chapter -8. Example(1C): . 192.168.10.0 with mask 255.255.255.128/25 How many subnets does the chosen subnet mask produce? Because 128 is 1 bit on ( 1 0000000), 2^1 = 2 How many valid hosts per subnet are available? We have 7 host bits (1 0000000 ), 2^7-2 = 126

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CS 350

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  1. CS 350 Chapter-8

  2. Example(1C): 192.168.10.0 with mask 255.255.255.128/25 • How many subnets does the chosen subnet mask produce? • Because 128 is 1 bit on (10000000), 2^1 = 2 • How many valid hosts per subnet are available? • We have 7 host bits (10000000), 2^7-2 = 126 • What are the valid subnets? • 256-128 = 128. So they are 0, 128 • What’s the broadcast address of each subnet? • 127, 255 • What are the valid hosts in each subnet? 192.168.10.0: 192.168.10.1~ 192.168.10.126 192.168.10.128: 192.168.10.129~ 192.168.10.254

  3. Example(2C): 192.168.10.0 with mask 255.255.255.192/26 • How many subnets does the chosen subnet mask produce? • Because 192 is 2 bit on (11000000), 2^2 = 4 • How many valid hosts per subnet are available? • We have 6 host bits (11000000), 2^6-2 = 62 • What are the valid subnets? • 256-192 = 64. So they are 0, 64, 128, 192 • What’s the broadcast address of each subnet? • 63, 127, 191, 255 • What are the valid hosts in each subnet? 192.168.10.0: 192.168.10.1~ 192.168.10.62 192.168.10.64: 192.168.10.65~ 192.168.10.126 192.168.10.128: 192.168.10.129~ 192.168.10.190 192.168.10.192: 192.168.10.193~ 192.168.10.254

  4. Example(1B): 172.16.0.0 with mask 255.255.128.0/17 • How many subnets does the chosen subnet mask produce? • Because 128 is 1 bit on (10000000), 2^1 = 2 • How many valid hosts per subnet are available? • We have 15 host bits 2^15-2 = 32,766 • What are the valid subnets? • 256-128 = 128. So they are 0.0, 128.0 • What’s the broadcast address of each subnet? • 127.255 , 255.255 • What are the valid hosts in each subnet? 172.16.0.0: 172.16.0.1~ 172.16.127.254 172.16.128.0 : 172.16.128.1~ 172.16.255.254

  5. Question 192.168.10.0 = Network 4 subnets: 6 hosts, 10 hosts, 12 hosts, and 25 hosts 2 routers: router1 connects subnet1 and 2, router2 connects subnet3 and 4 How to make the mask for each subnet?

  6. Troubleshooting IP Addressing • Check IP stack -- c:\> ping 127.0.0.1 • Check NIC -- c:\> ping 172.16.10.2 • Check local network from NIC to the router -- c:\> ping 172.16.10.1 • Check the IP communication between the local host to the remote server -- c:\> ping 172.16.20.2 Packet InterNet Groper (ping) traceroute –unix or linux tracert --windows arp –a ipconfig /all

  7. NAT Placement and operation of a NAT box.

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