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Re: Alternative to NetFlow for Measuring Traffic flows

  • From: Joe Abley
  • Date: Mon Dec 16 22:40:54 2002


On Monday, Dec 16, 2002, at 22:28 Canada/Eastern, Richard A Steenbergen wrote:

On Mon, Dec 16, 2002 at 09:16:55PM -0500, K. Scott Bethke wrote:

based on ALL the ASN's of the people on the peering switch.. but in most
cases anyone pushing any real traffic will probably not have fine grained
samples enough to determine a peering relationship based on a single AS
with this method. Maybe Im wrong but hey if you are taking 200megs from any
one ASN I would hope you knew about it.
Also, that method has the same "knowing the routes" problem as netflow.
Whereever you are getting your list of ASN's route ASN.*"'s routes, there
is pretty much no way they are accurate (for an ASN of ANY size).

You would have to statically route (or otherwise inject routes with a
specific nexthop) a list of their customer prefixes that would have to be
manually transmitted.
If you are interested in traffic *to* a particular destination, surely you could just tweak localpref on routes based on an as-path filter?

If you are interested in traffic *from* a particular destination (you have a network full of eyes, not content) then this approach is not useful anyway.


Joe