[j-nsp] Strange Packet Loss Problem

[Robert D. Holtz - Lists]

Sorry about being vague on my first response.

What you want to try to do is perform a layer 2 ping, i.e. bypass the
routing engine, in order to see if it's a layer 2 or layer 3 issue.

Now the rub ... I'm not in front of a Juniper box so I'm not sure of the
syntax for pinging a sonnet interface ... it's probably something like "ping
interface s0/...".

It may not support the same functionality that pinging an atm interface has.

-----Original Message-----
From: Christian Koch [mailto:ckoch at globix.com] 
Sent: Friday, October 20, 2006 2:24 PM
To: Robert D. Holtz - Lists; juniper-nsp at puck.nether.net
Subject: RE: [j-nsp] Strange Packet Loss Problem

Hi Robert,

There are no atm interfaces on these routers, only sonet and gige's

-----Original Message-----
From: Robert D. Holtz - Lists [mailto:robert.d.holtz at gmail.com] 
Sent: Friday, October 20, 2006 2:51 PM
To: Christian Koch; juniper-nsp at puck.nether.net
Subject: RE: [j-nsp] Strange Packet Loss Problem

You could possibly try pinging at the ATM interface level (layer 2) and
see if the problem is still there.

-----Original Message-----
From: juniper-nsp-bounces at puck.nether.net
[mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Christian Koch
Sent: Friday, October 20, 2006 1:36 PM
To: juniper-nsp at puck.nether.net
Subject: [j-nsp] Strange Packet Loss Problem

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
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