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Step 1

Nov 24,2008 by alperen

Summary of Step 1

Although it took about 10 pages of this chapter, the first step in this simple routing example boils down to a pretty basic process, as follows:

1.	Create the IP packet by encapsulating transport layer data after an IP header.
2.	Check the ARP cache to see if the MAC address of the default gateway is known. If it's not, use ARP to learn that MAC address.
3.	Encapsulate the packet inside an Ethernet frame.
4.	Send the Ethernet frame.

Although this short routing algorithm doesn't match every possibility, it certainly matches the logic Hannah uses to try to send a packet to the web server at 130.4.3.3. Toward the end of this chapter, you'll learn a few exceptions to how an IP host might behave, but for now, Hannah's part of this example is complete. The next section discusses what R1 does with the packet.

Related news

» Yet Another Ethernet Data Link Frame
by alperen posted on Nov 24,2008
» Yet Another Short-Lived Ethernet Frame
by alperen posted on Nov 24,2008
» Encapsulating an IP Packet in an Ethernet Frame
by alperen posted on Nov 24,2008
» You Can't Just Send Data; You Have to Send a Frame
by alperen posted on Nov 25,2008
» The Still Useful, but Still Short Life of an Ethernet Frame
by alperen posted on Nov 24,2008

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