[ 1445.612274][T12601] netdevsim netdevsim256 eni256np1: renamed from eth0 [ 1445.629993][T12600] netdevsim netdevsim754 eni754np1: renamed from eth1 [ 1449.266652][T12593] Could not find device with ifindex 2000 in netnsfd 11 [ 1449.267908][T12593] Could not find netns with fd: 2000 [ 1449.268974][T12593] Cannot link a netdevsim to itself [ 1449.270197][T12593] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).