netdev - Re: iproute2 - modifying routes in place

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Date:   Mon, 14 May 2018 16:10:44 -0400
From:   Ryan Whelan <rcwhelan@...il.com>
To:     David Ahern <dsahern@...il.com>
Cc:     netdev@...r.kernel.org
Subject: Re: iproute2 - modifying routes in place

On Mon, May 14, 2018 at 2:49 PM David Ahern <dsahern@...il.com> wrote:

> On 5/14/18 12:40 PM, Ryan Whelan wrote:
> > Same behavior:
> >
> >
> > root@...elan-linux ~
> > # ip -6 route
> > ::1 dev lo proto kernel metric 256 pref medium
> > fd9b:caee:ff93:ceef:3431:3831:3930:3031 dev internal0 proto kernel
metric
> > 256 pref medium
> > fd9b:caee:ff93:ceef:3431:3831:3930:3032 dev internal0 src
> > fd9b:caee:ff93:ceef:3431:3831:3930:3031 metric 1024 pref medium
> > fe80::/64 dev enp0s3 proto kernel metric 256 pref medium
> > fe80::/64 dev enp0s8 proto kernel metric 256 pref medium
> > fe80::/64 dev internal0 proto kernel metric 256 pref medium
> >
> > root@...elan-linux ~
> > # ip -6 route change fd9b:caee:ff93:ceef:3431:3831:3930:3032 dev
internal0
> > src fd9b:caee:ff93:ceef:3431:3831:3930:3031 metric 10
> > RTNETLINK answers: No such file or directory

> 'change' only sets NLM_F_REPLACE. Since NLM_F_CREATE is not set ('ip ro
> replace') it does not add a new route and expects one to exist. Your
> table above shows the prefix with metric 256 not metric 10 so the route
> does not match. You should be seeing a message in dmesg to this effect.


Is there a syntax for changing a route in-place?  Specifically, i'm
interesting in changing the metric of currently existing routes.