sd_icmp6_nd_set_index 1240 src/network/networkd-link.c                 r = sd_icmp6_nd_set_index(link->icmp6_router_discovery,
sd_icmp6_nd_set_index   43 src/systemd/sd-icmp6-nd.h int sd_icmp6_nd_set_index(sd_icmp6_nd *nd, int interface_index);