Homework model solutions.

For 09/16/2002:

Go to  www.ietf.org  .
Click on  ``RFC Pages''.
Fill in ``1700'' and click on  Go.

This gives you the whole RFC. A search for Ethertype and some scrolling 
gives you the answer:


         0660                     DLOG                     [XEROX]
         0661                     DLOG                     [XEROX]
  2048   0800        513   1001   Internet IP (IPv4)     [105,JBP]
  2049   0801        -      -     X.75 Internet            [XEROX]
  2050   0802        -      -     NBS Internet             [XEROX]

(5 lines, the middle line of which is the line that actually tells you 
the ethertype of  IPv4: 0800 in hexadecimal). 

For 09/23/2002:

Go to  www.ietf.org  .
Click on ``RFC Pages''.
Click on ``RFC Editor Web Pages''.
Click on ``RFC Search''.
Fill in ``1700'' and click on ``search'' .
Click on  ``3232''  in the left-hand column.

That gives you RFC 3232. Read the whole RFC. It tells you the information 
you are looking for can be found in   www.iana.org  .
Go to  www.iana.org  .
Click on  ``Protocol Number Assignment Services''
Click on  ``E''.
Click on  ``Ethernet Numbers''
Search for IPv4 :

         0660                     DLOG                     [XEROX]
         0661                     DLOG                     [XEROX]
  2048   0800        513   1001   Internet IP (IPv4)        [IANA]
  2049   0801        -      -     X.75 Internet            [XEROX]
  2050   0802        -      -     NBS Internet             [XEROX]

Search for IPv6 :

         86DB                     SECTRA                   [XEROX]
         86DE                     Delta Controls           [XEROX]
         86DD                     IPv6                      [IANA]
 34543   86DF        -      -     ATOMIC                  [Postel]
         86E0-86EF                Landis & Gyr Powers      [XEROX]

Go Back, two times.
Click on ``P''.
Click on ``Protocol Numbers''.

Response you must give for  TCP:

     4     IP          IP in IP (encapsulation)          [RFC2003]
     5     ST          Stream                    [RFC1190,RFC1819]
     6     TCP         Transmission Control               [RFC793]
     7     CBT         CBT                             [Ballardie]
     8     EGP         Exterior Gateway Protocol     [RFC888,DLM1]

(Also tells you about IP, IPv4 over IP). Response you must give for UDP:

    15     XNET        Cross Net Debugger            [IEN158,JFH2]
    16     CHAOS       Chaos                                 [NC3]
    17     UDP         User Datagram                  [RFC768,JBP]
    18     MUX         Multiplexing                    [IEN90,JBP]
    19     DCN-MEAS    DCN Measurement Subsystems           [DLM1]

This is the ``perfect solution''. You do not need to give all intermediate 
steps, just the 4 times 5 lines, with in each of the 4 cases the ``middle''
line being the one that really matters. I wanted you to give the extra 
lines to make sure you used the iana database.

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Challenge:
Find the protocol number for IPv6 (IPv6 over IP).
Find the ethertypes of ARP, RARP.
Look through the lists of ethertypes and see whether there are protocols
you have heard about.
Look through the list of protocl numbers and see whether there are 
protocols you have heard about.

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