[ 1090.007595][T11098] Could not find device with ifindex 2000 in netnsfd 11
[ 1090.008458][T11098] Could not find netns with fd: 2000
[ 1090.009321][T11098] Cannot link a netdevsim to itself
[ 1090.010036][T11098] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).