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MAC address of the DNS server If the router doesn t have it in its local ARP table, the router will have to ARP for it Notice that a hub connects Router-A, RouterB, and the DNS server Hubs are physical layer devices, so when the hub receives the frame from Router-A, it repeats the signal out to all remaining interfaces Therefore, both Router-B and the DNS server will receive the ARP Unlike a switch, no learning process takes place here since the hub isn t looking at the layer 2 information only the physical layer signal The DNS server will add Router-A to its local ARP table and send an ARP reply to Router-A containing the DNS server s MAC address Router-A can now forward the DNS query to the DNS server, using the information in PDU 2 in Table 10-1 Notice that the only thing that has changed from PDU 1 to PDU 2 is the Ethernet frame header information the original IP packet and encapsulated UDP segment are still the same When the DNS server receives the Ethernet frame, the NIC sees a match in the destination MAC address, strips off the Ethernet header, and forwards the IP packet up the protocol stack The Internet layer compares the destination IP address with the server s address, sees a match, sees that the protocol is UDP, and passes this up to the transport layer The transport layer sees a destination port number of 53 and knows that the DNS application on the server should process the DNS query The server looks up the name and then sends back an appropriate DNS reply, with an IP address of 10032 for the PC-B lookup PDU 3 in Table 10-1 shows the Ethernet, IP, and UDP header for the reply Assume that the default gateway address for the DNS server is Router-A Notice two things about this: first, the destination MAC address is Router-A, the exit point for the Ethernet segment; second, notice that the source and destination UDP port numbers are reversed from the original DNS query The source port number is the number the source uses, which is 53 in this case since the connection was directed to this port The destination port number is 50,000, which PC-A is listening on for the returning UDP DNS reply When Router-A receives the frame, it does its MAC comparison, strips off the Ethernet frame, does its route lookup, determines that the destination is directly off interface 1, examines the ARP table and sees the MAC address, and then reencapsulates the DNS reply in a new Ethernet frame with a source MAC address of 00001111BBBB and a destination MAC address of 00001111AAAA This is shown in PDU 4 of Table 10-1 The switch intelligently forwards the frame out of port 1 PC-A receives the frame, passes it up to layer 3, passes it up to layer 4, and sees the destination port of 50,000 PC-A compares this to its local connection table and knows that this is the DNS reply it s waiting for, so it now knows the IP address of PC-B
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10: Sending and Receiving TCP/IP Packets
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When testing connectivity, rst ping the destination host If you get no response, ping the local device s loopback: ping 127001 If this is successful, you know that TCP/IP is correctly installed on your host Next, make sure your host was assigned an IP address from a DHCP server (ipcon g in Windows)Then ping the IP address on the PC; if this doesn t work,
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you have a physical layer problem: the switch port to which the PC is connected might not be enabled, no cable might be connected, or the cable may be bad Then ping the default gateway address to ensure you have connectivity to the exit point of the subnet Finally, use traceroute (tracert in Windows) to see where the problem exists in the layer 3 network
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