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Re: About the address allocation convention between ISPs
From: David Barak <thegameiam () yahoo com>
Date: Tue, 3 Jun 2003 06:34:08 -0700 (PDT)

Many larger networks (with multiple interconnections
will split the chore, where the numbering reflects
exactly who is responsible for the physical circuit.  

So alas, there is no one "right" answer to your
question, unless you're going to try to put together a
table based on the naming conventions...

for instance, probably hop "6" is the actual interface
between 7018 and 209 in NY according to this view.

  5 gar4-p300.n54ny.ip.att.net ( [AS 7018]
4 msec 4 msec 4 msec
  6 att-gw.ny.qwest.net ( [AS 7018] 4
msec 4 msec 4 msec
  7 jfk-core-03.inet.qwest.net ( [AS
209] 4 msec 4 msec 4 msec

-David Barak

--- Teng Fei <tfei () ipanema ecs umass edu> wrote:

Hello everyone,

I have a question about the convention of address
allocation between ISPs.
If a smaller ISP tries to establish connection with
its provider, does
this small ISP configure one of the interface on its
boarder router using
an IP address obtained from the provider, or it is
the other way around,
that is, the provider uses one of the IP address
belongs to the customer
to configure the provider's boarder router?

I have this question because I am trying to identify
the link between two
organizations from traceroute measurements.   How
the addresses are
allocated will affect the identification of the
inter-domain link by
exactly one hop.

I am not sure if there is such a convention at all,
or the address
assignment is randomly decided according to the
agreement between the
customer and the provider?

Since I know there are many seasoned network
professionals on this mailing
list, I think it might be a proper question to ask
here.  Would anyone
kindly be willing to share your experience?  Thank
you very much!



David Barak
-fully RFC 1925 compliant-

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