[j-nsp] Strange Packet Loss Problem

[Jared Gull]

Are you seeing this issue only when sourcing the icmp
traffic from the router (i.e. do you also see this
behavior when the traffic is transiting both
devices?)?  Do you have any filter's in place on
either of these two M40s (lo0 filters or for the
interfaces that connect the two)?  If so, what do the
filters look like?  Also, what version are you
running?

--- Christian Koch <ckoch at globix.com> wrote:

> Hi All,
> 
> I am experiencing a strange issue between 2 m40 core
> routers connect
> through an oc48 link
> 
> I experience packet loss only when sending packets
> between 293 and 599
> bytes.
> 
> I am also speaking to cold telecom about the issue
> to see if it's a
> problem with the sonet link, but as of now the link
> is not taking any
> errors or alarms.
> 
> Anyone seen anything strange like this before?
> 
> ckoch at core2.lhr3> ping rapid 212.71.229.25 count
> 10000 size 300    
> PING 212.71.229.25 (212.71.229.25): 300 data bytes
>
!.!!.!!.!!!!.!.!....!!.!!!!!..!..!!.!!!..!!.!!....!!.!...!!!...!.!.!..!.
>
.!!...!....!..!.!.!!.!!.!!....!.!!!!!!..!..!.!!.!..!!.!!^C
> --- 212.71.229.25 ping statistics ---
> 129 packets transmitted, 66 packets received, 48%
> packet loss
> round-trip min/avg/max/stddev =
> 1.023/1.640/34.095/4.035 ms
> 
> ckoch at core2.lhr3> ping rapid 212.71.229.25 count
> 10000 size 400    
> PING 212.71.229.25 (212.71.229.25): 400 data bytes
> !!!!!!!!.!!!!!...!!^C
> --- 212.71.229.25 ping statistics ---
> 20 packets transmitted, 15 packets received, 25%
> packet loss
> round-trip min/avg/max/stddev =
> 1.074/1.111/1.348/0.071 ms
> 
> ckoch at core2.lhr3> ping rapid 212.71.229.25 count
> 10000 size 500    
> PING 212.71.229.25 (212.71.229.25): 500 data bytes
> !!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!^C
> --- 212.71.229.25 ping statistics ---
> 49 packets transmitted, 46 packets received, 6%
> packet loss
> round-trip min/avg/max/stddev =
> 1.141/1.202/2.514/0.210 ms
> 
> ckoch at core2.lhr3> ping rapid 212.71.229.25 count
> 10000 size 600    
> PING 212.71.229.25 (212.71.229.25): 600 data bytes
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!^C
> --- 212.71.229.25 ping statistics ---
> 955 packets transmitted, 954 packets received, 0%
> packet loss
> round-trip min/avg/max/stddev =
> 1.183/1.526/36.436/1.817 ms
> 
> koch at core2.lhr3> ping rapid 212.71.229.25 count
> 10000 size 292    
> PING 212.71.229.25 (212.71.229.25): 292 data bytes
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !!!!!!!!^C!
> --- 212.71.229.25 ping statistics ---
> 916 packets transmitted, 916 packets received, 0%
> packet loss
> round-trip min/avg/max/stddev =
> 0.988/1.146/9.918/1.061 ms
> 
> ckoch at core2.lhr3> ping rapid 212.71.229.25 count
> 10000 size 293    
> PING 212.71.229.25 (212.71.229.25): 293 data bytes
> ..!!!.!^C
> 
> Christian
> _______________________________________________
> juniper-nsp mailing list juniper-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/juniper-nsp
> 


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