[c-nsp] DoS tracking on the 6500

Nitzan Tzelniker nitzan.tzelniker at gmail.com
Fri Mar 18 04:04:33 EST 2005


Try to run the command 
"sh mls ip count"
if the output is more than 32000 you need sampling 
to configure sampling use 
"mls sampling packet-based 64 4096"
and dont forget "mls netflow sampling" on the interface

you can read more here  
http://www.cisco.com/en/US/products/hw/switches/ps708/products_configuration_guide_chapter09186a0080179591.html

Nitzan

On Thu, 17 Mar 2005 18:19:38 -0500 (EST), Jon Lewis <jlewis at lewis.org> wrote:
> On Thu, 17 Mar 2005, Dale W. Carder wrote:
> 
> > What are your netflow/mls settings, specifically are you recording src
> > and dest information, because perhaps dest-only didn't capture the
> > data you needed?  Are you sampling?  What is your table size set at?
> 
> Running just IOS, 122-18.SXD3
> #sh conf | inc  mls
> mls aging fast time 8 threshold 3
> mls aging long 480
> mls aging normal 32
> mls flow ip interface-full
> mls flow ipx destination
> mls nde sender version 5
> mls rate-limit unicast cef receive 10000
> mls qos
> 
> > Off the top of my head (we don't run hybrid anymore) I want to say
> > that the command to try is "sh mls ent long".  In native mode
> > it's something along the lines of "sh mls netflow ip nowrap".
> 
> Ah...I didn't notice the nowrap option last night and was cursing IOS for
> ignoring my term width.  That makes the output easier on the eyes...but it
> still looks like just a tiny sampling of the real data.
> 
> ----------------------------------------------------------------------
> Jon Lewis                   |  I route
> Senior Network Engineer     |  therefore you are
> Atlantic Net                |
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