Ping flooding (fwd)
Per Gregers Bilse
bilse at EU.net
Tue Jul 9 23:55:22 UTC 1996
On Jul 9, 17:57, "Daniel W. McRobb" <dwm at ans.net> wrote:
> The sampling Curtis mentioned on the NSS routers is a bit different.
> For one, it doesn't really impact forwarding performance (and hopefully,
> if/when implemented on the Bay, will not impact forwarding performance).
Not to pick nits, but what I quoted was a cache snapshot; caches
don't impact performance under normal circumstances, though their
construction may do so.
> But what we're specifically looking for in terms of continuous sampling
> (such as that we do on the NSS routers) is a net matrix... if you
> changed the Cisco flow switching stuff to use network numbers (and
> mask), you'd have something very much like what we're looking for in
> terms of continuous sampling. From there we build AS matrices, etc.
Yes ... but you shouldn't need anything special for that. We have
been doing the same for a long time, using regular IP accounting on
the edge routers, which is then summarised over a full routing table.
The only discrepancies that occur are if changes in routing occur
between the time of accounting and processing, but this tends not to
be a problem.
> The other thing about the flow-switching data that's different than the
> NSS (and probably what we'll get from Bay) is that there aren't really
> any nice ways of retrieving/storing the data automatically.
This used to be true, but "probably" isn't true any longer.
------ ___ --- Per G. Bilse, Mgr Network Operations Ctr
----- / / / __ ___ _/_ ---- EUnet Communications Services B.V.
---- /--- / / / / /__/ / ----- Singel 540, 1017 AZ Amsterdam, NL
--- /___ /__/ / / /__ / ------ tel: +31 20 6233803, fax: +31 20 6224657
--- ------- 24hr emergency number: +31 20 421 0865
--- Connecting Europe since 1982 --- http://www.EU.net e-mail: bilse at EU.net
More information about the NANOG