Steps to reproduce: Set up a VM connected to DUT and then create a vlan interface in a network namespace. Then try to run tracepath inside the network namespace from DUT to VM. See attached test script used to reproduce the problem. Analysis: Upgrade of iputils package to s20190709 solves the problem. root@du1:~# ip netns exec fib_2 tracepath -6 -n 2001:1b70:82a8:225:756:24:0:4 1: send failed Resume: pmtu 128000 root@du1:~# root@du1:~# ip netns exec fib_2 /tmp/tracepath_s20190709 -6 -n 2001:1b70:82a8:225:756:24:0:4 1?: [LOCALHOST] 0.012ms pmtu 1500 1: 2001:1b70:82a8:225:756:24:0:4 5.370ms reached 1: 2001:1b70:82a8:225:756:24:0:4 3.934ms reached Resume: pmtu 1500 hops 1 back 1
