Previously nl_send_route would use plain nl_add_nexthop for ecmp ipv6 routes instead of adding RTA_MULTIPATH objects via nl_add_multipath. The former lacks support for the rtnh_hops field needed for setting the nexthop weight though. On the kernel side support for nexthop weights was introduced by commit 398958ae48 ("ipv6: Add support for non-equal-cost multipath") which landed in 4.16. Before this the weight will simply be ignored. Support for the ipv6 RTA_MULTIPATH attribute was added in 51ebd31815 ("ipv6: add support of equal cost multipath (ECMP)") which landed in 3.10. If this version bound isn't met installing the route will fail. --- sysdep/linux/netlink.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/sysdep/linux/netlink.c b/sysdep/linux/netlink.c index eca681f9..cf1e18d2 100644 --- a/sysdep/linux/netlink.c +++ b/sysdep/linux/netlink.c @@ -74,7 +74,6 @@ #endif #define krt_ipv4(p) ((p)->af == AF_INET) -#define krt_ecmp6(p) ((p)->af == AF_INET6) const int rt_default_ecmp = 16; @@ -1403,7 +1402,7 @@ dest: { case RTD_UNICAST: r->r.rtm_type = RTN_UNICAST; - if (nh->next && !krt_ecmp6(p)) + if (nh->next) nl_add_multipath(&r->h, rsize, nh, p->af, eattrs); else { -- 2.30.2