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End-to-End Delivery Example
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7 PC-A receives the frame The NIC compares its MAC address to the destination MAC address and sees a match, so it passes the IP packet up to layer 3, where the PC accepts the OFFER by sending a DHCP REQUEST message directly to the DHCP server: Switch-A switches the frame directly between these MAC addresses PC-A also incorporates the IP addressing information into its NIC configuration 8 The DHCP server responds with a DHCP ACK message directly to PC-A, which the switch again directly switches to port 1 Now that PC-A has IP addressing information, it can begin communicating, via TCP/IP, to other IP-enabled devices
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PC-A Opens Up a Session to PC-B
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The remainder of this example, covered in the next few sections, illustrates PC-A opening up a telnet session to PC-B, including how DNS is used, how the TCP connection is built, and how it is torn down
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PC-A Resolving PC-B s Name
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Assume that PC-A doesn t know the IP address of PC-B, but it does know its name So from the Windows command prompt, the user on PC-A types in the following:
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C:\> telnet PC-B
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Since a name is used, DNS must be used to resolve it to an IP address PC-A creates a DNS query for the name PC-B and sends this to the DNS server Notice that since the DNS server is in a different subnet, the frame must be forwarded to the router first; therefore, the destination MAC address needed is Router-A s MAC address Since this is not originally known, PC-A will have to ARP for the MAC address associated with 10012, the default gateway The source MAC address in the ARP is PC-A s, and the destination MAC address is a broadcast, which SwitchA will flood Router-A will respond to the ARP with the correct IP addressing information (The router will also add PC-A s IP and MAC addresses to its local ARP table) In the Ethernet frame, the source MAC address will be the router s destination MAC address, PC-B The switch will perform its learning function, adding 00001111BBBB (the router s MAC address) to the CAM table At this point, the switch knows all the MAC address within the broadcast domain and can intelligently forward unicast frames without having to resort to flooding them
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10: Sending and Receiving TCP/IP Packets
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TABLE 10-1
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DNS PDUs
1 2 3 4
Dest MAC
00001111BBBB 00002222CCCC 00002222AAAA 00001111BBBB
Src MAC
00001111AAAA 00002222AAAA 00002222CCCC 00001111AAAA
Src IP
10011 10011 10023 10023
Dest IP
10023 10023 10011 10011
Protocol
UDP UDP UDP UDP
Src Port
50000 50000 53 53
Dest Port
53 53 50000 50000
When PC-A receives the ARP reply, it can build the DNS query and forward it to the switch The partial Ethernet frame, IP packet, and UDP segment headers (in the displayed order) are shown in PDU 1 of Table 10-1 The layers 3 and 4 information is stored in a local connection table so the PC knows what do with the DNS reply when it arrives You can see the local connection on a PC by using the netstat command
When sending an IP packet across the network, with the exception of the TOS and TTL elds, nothing else changes on a hop-by-hop basis as the packet travels across the layer 3 network The same cannot be said about the layer 2
framing, which changes on each segment Therefore, for a PC to send a packet to a PC on another segment, the source PC must use a layer 2 frame with the default gateway as the destination
Switch-A forwards the frame out port 3 directly to the router Router-A, upon receiving the frame, examines the destination MAC address and sees that it matches the local interface s MAC address Router-A strips off the Ethernet frame and passes it up the TCP/IP stack Since the destination IP address doesn t match its own interface 1 address, the router examines its local routing table and notices that it is directly connected to subnet 10020/24 on interface 2 Therefore Router-A knows that to get the frame to 10023, the router will have to know the corresponding
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