[ 1093.821772][T11097] Could not find device with ifindex 2000 in netnsfd 11
[ 1093.822622][T11097] Could not find netns with fd: 2000
[ 1093.823203][T11097] Cannot link a netdevsim to itself
[ 1093.823928][T11097] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).