[j-nsp] Strange Packet Loss Problem

[Christian Koch]

Jared,

 The issue is present transiting both devices.

There are no filters on either m40, the issue appeared out of nowhere...


ckoch at core2.lhr3> show version 
Hostname: core2.lhr3
Model: m40
JUNOS Base OS boot [7.0R2.7]
JUNOS Base OS Software Suite [7.0R2.7]
JUNOS Kernel Software Suite [7.0R2.7]
JUNOS Packet Forwarding Engine Support (M20/M40) [7.0R2.7]
JUNOS Routing Software Suite [7.0R2.7]
JUNOS Online Documentation [7.0R2.7]

ckoch at core2.lhr3>  

-----Original Message-----
From: Jared Gull [mailto:jmgull at yahoo.com] 
Sent: Friday, October 20, 2006 2:52 PM
To: Christian Koch; juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] Strange Packet Loss Problem

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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