On Fri, Jun 06, 2008 at 09:30:26AM -0700, bill fumerola wrote:
> On Thu, Jun 05, 2008 at 10:32:30AM -0400, Rodney Dunn wrote:
> > #1 issue with tunnels is usuall a fragmentation reassembley problem.
> 
> (damn, i'm usually smarter than this.. :->)
> 
> > Watch 'sh ip traffic' outputs for large jumps.
> > 
> > Clear the counters and capture snapshots of 'sh ip traffic'.
> 
> we were already tracking the IP-MIB in cacti, so viewing the ipFrag* and
> ipReasm* values made this obvious. good call.

;) Been burned too many times. 

> 
> > Also, do sh buff input-interface <name> packet' to see what
> > packets are being punted.
> > You have to do it against the subinterface if it's a trunk.
> 
> sure enough, a bunch of packets a few bytes over the MTU and a few bytes
> over the minimum. it would be nice to know through which tunnel they
> were coming from. is there anyway to use the memory values from 'sh buff
> input-interface' there to display the actual packets (or buffer)?

try 'sh buff assigned packet | grep Tu'.

> 
> thanks for your help, this was driving me mad. 
> 
> -- bill
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