[SOLVED] Iproute2 behavior

[yonghan]

I was trying to run the following in OpenWRT 19.07.1:

ip -6 r r default scope global \ 
nexthop via <gw1> dev <int1> weight 1 \
nexthop via <gw2> dev <int1> weight 2

however it seems to me that OpenWRT's own iproute2 (ip-full 5.0.0-2.1) does not honor the weight selection and defaults to 1:

default metric 1024 
	nexthop via <gw1> dev <int1> weight 1 
	nexthop via <gw2> dev <int1> weight 1 pref medium

whereas running the same line in a debian machine yields the following:

default metric 1024 
	nexthop via <gw1> dev <int1> weight 1 
	nexthop via <gw2> dev <int1> weight 2 pref medium

wonder anyone knows how to get around this?

[yousong]

It seems non-equal weight multipath nexthops for ip6 were only supported since 4.16 .

19.07 uses 4.14 kernel. What's the kernel version of your debian system?

[yonghan]

Ah it make sense now. Thanks!

Debian is 10.2 so the kernel is 4.19, newer than 19.07