RE: NetworkLayer

["Naslund, Steve" <SNaslund () medline com>]

Just a tip, but you cannot really determine packet loss on an MPLS network with a traceroute.  The nodes between the 
provider edge routers may not even represent your real path.  Also, provider routers within their network will be 
handling pings much differently than they handle your actual traffic.  The pings require processing whereas your MPLS 
traffic will be label switched.  Much different performance.

Now from the trace below :

If you have zero packet loss to the final hop, how could you possibly have packet loss along the path?  Answer, you 
can't and there is no loss between you and the final hop for your traffic.  What you are seeing is the intermediate 
node not bothering or being too busy to answer your ping.

Steven Naslund
Chicago IL

From: NANOG <nanog-bounces () nanog org> On Behalf Of K MEKKAOUI
Sent: Monday, September 23, 2019 4:10 PM
To: nanog () nanog org
Subject: NetworkLayer

Hi

Anyone  from Network Layer to help? We are experiencing packet loss on the their MPLS network. I have attached a 
screenshot. Thank you

4 38.140.46.161                      0%   31  16.3ms    18.6     6.4   153.1    24.9
 5 154.54.45.113                      0%   31   9.8ms    13.9       9    19.2     2.9
 6 62.115.168.46                      0%   31  12.5ms    16.3    10.2      66     9.7
 7 62.115.134.48                      0%   31  25.6ms    23.4    16.5    39.2     5.7
 8 62.115.51.98                       0%   31  19.4ms    22.6    16.6    49.9     6.1
 9 50.97.19.12                        0%   31  20.2ms      22    12.8    37.9     4.3 <MPLS:L=388134,E=0>
10 50.97.19.15                        0%   31  35.9ms      33    28.6    41.7       3 <MPLS:L=361891,E=0>
11 50.97.17.30                       71%   31 timeout    35.3    29.8    42.8     4.9 <MPLS:L=624054,E=0>
12 169.45.18.4                       40%   31    58ms    56.4    50.6    61.6     3.1 <MPLS:L=311929,E=0>
13 169.45.18.41                       0%   30 149.6ms    62.7    50.5   149.6    23.4
14 169.48.118.131                     0%   30 133.4ms    59.8    50.2   133.4    14.7


Karim