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RE: About the address allocation convention between ISPs

  • From: Robert Bridgham
  • Date: Wed Jun 04 14:12:11 2003

Teng,

You can also use whois to determin who owns the /30 between the hop in
question.  If ISPx comes up as the holder of the netblock in the
registration then that traceroute result is comming from ISPx.  Hopefully
this helps!


- Robert

> -----Original Message-----
> From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu]On Behalf Of
> Teng Fei
> Sent: Monday, June 02, 2003 9:11 PM
> To: nanog@merit.edu
> Subject: About the address allocation convention between ISPs
>
>
>
> 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!
>
> Sincerely
>
> Teng
>
>





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