[e2e] trading acks...TRACKS

Joe Touch touch at ISI.EDU
Sun Dec 3 19:07:29 PST 2006

Lloyd Wood wrote:
> At Sunday 03/12/2006 11:45 -0800, Joe Touch wrote:
>> Mirco Musolesi wrote:
>>>>> However, packet conservation through a router is something that
>>>>> can be aspired to, under limited conditions - thinking about
>>>>> a networking analogue of Kirchoff's electrical laws through the
>>>>> router as a point can actually be useful, too.
>>>> I'm not sure Kirchoff's laws are applicable here. It wouldn't make sense
>>>> to create/destroy electrons without a source/sink; the same is not true
>>>> for packets.
>>> You may think to a representation of the network with connections to the
>>> "ground" or a "voltage source" for each router to represent/quantify
>>> packets that are created/lost in it.
>> Right - but then Kirchoff's laws don't apply unless that connection to
>> ground has some impedence 
> resistance! (The impedance has to have a real part, otherwise everything's at ground.)

Kirchoff's laws work for impedance too ;-)

>> (otherwise the entire net is grounded). What's
>> the impedence of a router? :-) I.e., it's dynamic (which is OK) and
>> content-sensitive (which seems hard to model).
> The analogy would be that the router's input and output impedances are frequency-sensitive, and the content's sent at different frequencies (ports/addresses/QoS/whatever).
> Talking of "impedance mismatches" between fat and thin pipes is quite common.

Agreed, which is why impedance is what I thought of. Resistive
Kirchoff's nets don't make sense here, IMO.


Joe Touch
Sr. Network Engineer, USAF TSAT Space Segment

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