Has Level3 done away with traceroute??

["Van Dyk, Donovan via NANOG" <nanog () nanog org>]

Hello All,

Recently I was troubleshooting a network event for a client of our who resides on the Level3 network. While trying to 
verify the path, I noticed I am no longer able to traceroute through the Level3 network.
The funny thing is this is not just isolated to the /32. It appears to be that the entire 4.0.0.0/9 network is no 
longer able to traceroute through. Everything dies on their edge network.

This appears to be isolated to traceroute. I have check this in NA and EU.

My carrier contacted Level3 who pretty much stated that they can’t provide anything.

I have checked multiple looking glasses and other online tools and none of them make it. Even Level3 looking glass 
drops the packets.

Does anyone know anything about this? I’m pretty sure this is the first time we are seeing this.


Random 4.0.0.0/9 address.

NTT looking glass
Tracing the route to 4.35.230.7

1   *
    ae-2.a00.snjsca04.us.bb.gin.ntt.net (129.250.3.58) 3 msec  1 msec
 2   *  *  *
 3   *  *  *
 4   *  *  *
 5   *  *  *
 6   *  *  *


TATA looking glass
traceroute to 4.7.6.4 (4.7.6.4), 30 hops max, 52 byte packets
1  if-ae-14-3.tcore2.FNM-Frankfurt.as6453.net (195.219.87.89)  2.056 ms if-ae-6-2.tcore1.FR0-Frankfurt.as6453.net 
(195.219.50.173)  1.253 ms  1.177 ms
     MPLS Label=616998 CoS=0 TTL=1 S=1
2  195.219.50.50 (195.219.50.50)  1.214 ms  1.247 ms  1.535 ms
3  195.219.50.50 (195.219.50.50)  1.144 ms *  2.246 ms
4  * * *
5  * * *
6  * * *
7  * * *
8  * * *
9  * * *
10  * * *


Telia looking glass
traceroute to 4.7.6.4 (4.7.6.4), 30 hops max, 52 byte packets
1  if-ae-14-3.tcore2.FNM-Frankfurt.as6453.net (195.219.87.89)  2.056 ms if-ae-6-2.tcore1.FR0-Frankfurt.as6453.net 
(195.219.50.173)  1.253 ms  1.177 ms
     MPLS Label=616998 CoS=0 TTL=1 S=1
2  195.219.50.50 (195.219.50.50)  1.214 ms  1.247 ms  1.535 ms
3  195.219.50.50 (195.219.50.50)  1.144 ms *  2.246 ms
4  * * *
5  * * *
6  * * *
7  * * *
8  * * *
9  * * *
10  * * *


Level3 looking glass
Traceroute results from Atlanta, GA to 4.200.65.42(dialup-4.200.65.42.Dial1.LosAngeles1)

  1  0.0.0.0  * * *
  2  0.0.0.0  * * *
  3  0.0.0.0  * * *
  4  0.0.0.0  * * *
  5  0.0.0.0  * * *
  6  0.0.0.0  * * *
  7  0.0.0.0  * * *
  8  0.0.0.0  * * *
  9  0.0.0.0  * * *
 10  0.0.0.0  * * *
 11  0.0.0.0  * * *

--
Donovan Van Dyk
SOC Network Engineer
Fort Lauderdale, FL USA

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