On Saturday 02 January 2021 19:10:54 Pali Rohár wrote: > Hello! > > On Saturday 02 January 2021 19:04:06 Alejandro Colomar (man-pages) wrote: > > I've seen there's ifr_ifindex too (see SIOCGIFNAME). > > Can it be used in the same way as ifr6_ifindex? > > Sorry, I do not know too. In all applications I saw that they are using > ifr_name for IPv4 stuff. > > This needs to be tested if ifr_ifindex instead of ifr_name works for > specifying IPv4 address. Now I can answer, no, it cannot be used. ifr_ifindex is part of union structure where is also ifr_addr. So you can specify either ifr_ifindex or ifr_addr, but not both fields at the same time. Therefore network interface for IPv4 address can be specified only via ifr_name.
