"luwei (O)" <luwei32@xxxxxxxxxx> writes: > Andrii and Toke inspired me. You are right, the libbpf version should be included in -V output > , but not mine. I searched google and found this page: https://www.spinics.net/lists/netdev/msg700482.html > , according which I re-compiled iproute2 and it works. Did the libbpf version appear in the output of 'ip -V' after you recompiled and enabled it? It does in mine: $ ./ip/ip -V ip utility, iproute2-5.13.0, libbpf 0.4.0 -Toke