ip route: error out on multiple via without nexthop keyword
To specify multiple nexthops in a route the user is expected to use the
"nexthop" keyword which ip route uses to create the RTA_MULTIPATH.
However, ip route always accepts multiple 'via' keywords where only the
last one is used in the route leading to confusion. For example, ip
accepts this syntax:
$ ip ro add vrf red 1.1.1.0/24 via 10.100.1.18 via 10.100.2.18
but the route entered inserted by the kernel is just the last gateway:
1.1.1.0/24 via 10.100.2.18 dev eth2
which is not the full request from the user. Detect the presense of
multiple 'via' and give the user a hint to add nexthop:
$ ip ro add vrf red 1.1.1.0/24 via 10.100.1.18 via 10.100.2.18
Error: argument "via" is wrong: use nexthop syntax to specify multiple via
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
1 file changed