From: Abhinav Jain (jain0122_at_cs.washington.edu)
Date: Mon Jan 12 2004 - 11:10:23 PST
Just a confirmation... I believe that sequence numbers are just plain
numbers indicating the nth packet we sent out,,, so i believe every node
will have sequence numbers from 1 to n
while TTL field should be 1 to maxTTL..
Please correct me if I am on the wrong track.
Thanks
Abhinav
----- Original Message -----
From: "Janet Davis" <jlnd_at_cs.washington.edu>
To: <cse461_at_cs.washington.edu>
Sent: Monday, January 12, 2004 10:54 AM
Subject: [Cse461] Re: TTL Specifications
> An addendum:
>
> The range of valid sequence numbers is 1..MAX_TTL. When you originate a
> packet, its TTL should be MAX_TTL when you call sendPkt. For forwarding,
> also note that you can't send a packet with TTL 0.
>
> On the receiving side, you should accept (i.e., process) any packet that
> has a valid TTL when it arrives.
>
> Cheers,
> Janet
>
> On Sun, 11 Jan 2004, Janet Davis wrote:
>
> > The important thing to note is that it is not valid to send a packet
with
> > TTL=0. This implies that when you get a packet with TTL=1, you should
> > process it if you are its destination---and then drop it if its TTL
> > becomes 0. You can generalize this rule to higher TTL values.
> >
> > Cheers,
> > Janet
> >
> > On Sun, 11 Jan 2004, Alissa Harrison wrote:
> >
> > > Janet,
> > >
> > > My partner and I were discussing the specification for decrementing
> > > TTLs. We think that because there is ambiguity between when a TTL gets
> > > decremented that interoperability problems could arise. This would
> > > happen if one app decremented the TTL on the send while another
> > > decremented on the recieve of a packet (when talking to another
student,
> > > we found we were disagreeing when to decrement). Shouldn't there be a
> > > clear guideline for the whole class?
> > >
> > > Alissa and Jon
> >
> > --
> > Janet Davis
> > jlnd_at_cs.washington.edu
> > http://www.cs.washington.edu/homes/jlnd/
> >
> >
>
> --
> Janet Davis
> jlnd_at_cs.washington.edu
> http://www.cs.washington.edu/homes/jlnd/
>
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