[e2e] Header length field in IP header

Joe Touch touch at ISI.EDU
Thu Sep 23 11:01:23 PDT 2004


PS - if you're going to pick some bits to modify that existing routers 
might already drop, why not just use another IP version?

Joe

Saad Biaz wrote:

> On Thu, 23 Sep 2004, Craig Partridge wrote:
> 
> 
>>In message <4152F8A9.2090500 at isi.edu>, Joe Touch writes:
>>
>>
>>>Error - drop the packet. If the IP version field is 4 (I'm assuming you
>>>mean IPv4), there are required fixed-length fields. As per RFC791, pg 11:
>>
>>Joe:
>>
>>You're quite right, but realize the point here -- we have found some
>>free bits!!
> 
> 
> 
> That was exactly my intent!
> 
> 
>>All we need to do is write a standards document that says values
>>0,1,2,3 and 4 are to be interpreted as "5 + a bit value to be determined"
>>and we get 5 more values we can signal in the IP header!  Diff serv
>>has more bits to play with!  <Running for cover... :-)>
> 
> 
> Geee, and I was thinking Diffserv too!
> 
> Thank you-
> 
> 
> 
> ----------------------------------------------------------------------
> Saad Biaz, Ph.D., Assistant Prof.     Voice: (334) 844 6307
> 114 Dunstan Hall Auburn University    Fax  : (334) 844 6329
> Auburn, AL 36849-5347, USA            http://www.eng.auburn.edu/~sbiaz
> ----------------------------------------------------------------------
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