[mrtg] Re: cisco - routers - access lists dropping packets - graphing?

Larry Sheldon lsheldon at creighton.edu
Thu Jun 28 02:19:28 MEST 2001

> Right.  Correctly received packets that are not forwarded to higher-layer
> protocols does not seem to apply here so my gut feeling remains: the
> packets are not counted (in ifInDiscards) if blocked by an access list.
> This is because the packets will have been counted by ifInOctets.
> Again: just a gut feeling and I may be wrong again.

As I said before, eventually one of us is going to have to look it utp, but
belief (cf. differences between "beliefs" and "facts" or even "theories!) is
that if the packet is in good enough shape to get counted in 
ifIn[Ucast|NUCast|??]Pkts, it will have to be accounted-for somewhere.  

I think ACL casualities get count in ifInDrops or some such place.

> Time and resources permitting I will setup a system where I just flood
> ping some host behind a router.  I'll then measure both with and without
> blocking the pings.

That would be interesting.
.                                                                       .
- L. F. (Larry) Sheldon, Jr.                                            -
. Unix Systems and Network Administration                               .
- Creighton University Computer Center-Old Gym                          -
. 2500 California Plaza                                                 .
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. lsheldon at creighton.edu                  of System Administrators:     .
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. 402 681-4726 (cellular)               learn from their mistakes.      .
- 402 332-4622 (residence)                                              -
. http://www.creighton.edu/~lsheldon    Adapted from Stephen Pinker     .

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