On Mon, 21 Jan 2019 09:14:52 -0700 David Ahern <[email protected]> wrote:
> You always add IF_ID even if not set by user. The kernel code does not
> appear to require it so why pass a default value?
0 (the default) is a valid IF_ID, so setting an interface with a non-zero IF_ID
back to 0 is possible. I think the better solution would be to check for
existing
values so an "ip link set" doesn't try and automatically use 0 if unsepcified.
> The kernel code does appear to require this parameter, so why have
> this requirement in iproute2?
Looks to be required, without the check I get:
RTNETLINK answers: No such device
> What about IFLA_XFRM_LINK?
It shows up as the parent interface when you ip link show:
13: xfrm2@wlan0: <NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group
default qlen 1000
link/none 48:e2:44:f6:77:51 brd ff:ff:ff:ff:ff:ff
But I can print it again if you think I should.
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