mpls labels not parsed in traceroute -e

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xijq227
Posts: 3
Joined: 2018/09/04 01:48:47

mpls labels not parsed in traceroute -e

Post by xijq227 » 2018/09/04 02:02:23

Hi,

I attempt to traceroute from a CentOS1(10.10.14.2) to CentOS2(10.10.17.2) through a MPLS Cloud.
Linux version 3.10.0-862.11.6.el7.x86_64 (builder@kbuilder.dev.centos.org) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-28) (GCC) ) #1 SMP Tue Aug 14 21:49:04 UTC 2018

The expected path should be 10.10.14.1>14.1.1.4>10.10.11.6>10.10.17.2. However, the second hop is not displayed:
[nexus@localhost ~]$ traceroute -e 10.10.17.2
traceroute to 10.10.17.2 (10.10.17.2), 30 hops max, 60 byte packets
1 10.10.14.1 (10.10.14.1) 340.484 ms 340.306 ms 340.073 ms
2 * * *
3 10.10.11.6 (10.10.11.6) 21.978 ms 21.794 ms 22.611 ms
4 10.10.17.2 (10.10.17.2) 21.692 ms !X 21.444 ms !X 21.192 ms !X

when I do a tcp dump, I can proof that ICMP time exceeded in-transit has been correctly received.
[nexus@localhost ~]$ sudo tcpdump -i eth1.10 'icmp[0] == 11 and icmp[1] == 0'
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth1.10, link-type EN10MB (Ethernet), capture size 262144 bytes
09:59:48.381672 IP 10.10.14.1 > localhost.localdomain: ICMP time exceeded in-transit, length 36
09:59:48.394670 IP 14.1.1.4 > localhost.localdomain: ICMP time exceeded in-transit, length 152
09:59:48.605218 IP 10.10.11.6 > localhost.localdomain: ICMP time exceeded in-transit, length 36
^C
3 packets captured
3 packets received by filter
0 packets dropped by kernel

I need the mpls label stack embedded in icmp extensions to be parsed an displayed. anything I could try?
trace.zip
(944 Bytes) Downloaded 186 times

xijq227
Posts: 3
Joined: 2018/09/04 01:48:47

Re: mpls labels not parsed in traceroute -e

Post by xijq227 » 2018/09/20 03:15:05

Hi , any kind assist?

xijq227
Posts: 3
Joined: 2018/09/04 01:48:47

Re: mpls labels not parsed in traceroute -e

Post by xijq227 » 2018/10/05 03:37:17

Hi , any kind assist?

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