This patch works around a recent extension of the netlink driver I had made use of when building the netlink messages. Unfortunately older kernels don't accept IFLA_IFNAME + name of interface as a replacement for the interface's index, so this patch now gets the interface index ifindex if it's not provided (ifindex <= 0). Signed-off-by: Stefan Berger <stefanb@us.ibm.com> --- src/util/macvtap.c | 3 +++ 1 file changed, 3 insertions(+) Index: libvirt-acl/src/util/macvtap.c =================================================================== --- libvirt-acl.orig/src/util/macvtap.c +++ libvirt-acl/src/util/macvtap.c @@ -905,6 +905,9 @@ ifaceGetNthParent(int ifindex, const cha *nth = 0; + if (ifindex <= 0 && ifaceGetIndex(true, ifname, &ifindex) != 0) + return 1; + while (!end && i <= nthParent) { rc = link_dump(true, ifname, ifindex, tb, &recvbuf); if (rc)