Weird Issues within L3

Tue Oct 7 23:27:09 UTC 2014

On 10/07/2014 11:36 AM, Khurram Khan wrote:
> Hi Group,
> 
> We have a couple of circuits , internet facing with Level 3 and from
> our edge in San Diego, seeing some packet loss when trying a ping to
> 4.2.2.4, sourcing from 63.214.184.3. anyone seeing a similar issue ?
> 
> Packet sent with a source address of 63.214.184.3
> !.!!!.!!!!!!!!!!!!!...!!!..!!!!!!.!!.!!!!!!.!..!!.!!.!!!!!!!!!!!!!!!!!
> !!!!!!!!!.!!.!!!..!!!!!.!!!!.!
> Success rate is 80 percent (80/100), round-trip min/avg/max = 12/13/16 ms
> 

I'm not with level3, but the pattern looks exactly like what happens
when a destination node has rather severe rate-limiting in place, and
multiple people are sending ICMP.  Try spacing your ping packets.  On
Linux, the command switch is "ping -i 3" to send packets every three
seconds; for MTR it's "mtr -i 3" -- If you are using something else,
there should be an "interval" parameter that you can set to minimize
rate-limiting effects.

Have you tried sending real traffic to 4.2.2.4, and looking at the
packet traffic?