[ 1238.339939][T11143] netdevsim netdevsim300 eni300np1: renamed from eth0 [ 1238.354411][T11142] netdevsim netdevsim589 eni589np1: renamed from eth1 [ 1241.587993][T11135] Could not find device with ifindex 2000 in netnsfd 11 [ 1241.588847][T11135] Could not find netns with fd: 2000 [ 1241.589425][T11135] Cannot link a netdevsim to itself [ 1241.590107][T11135] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).