Re: [PATCH] netlink: Don't warn about multiple interfaces when there's only one

[Stefano Brivio <sbrivio@redhat.com>]

On Sat, 22 Aug 2026 17:48:56 +0900
Hayato Kiwata <dev@haytok.jp> wrote:

> Suppose there is a single network interface on the host, with two
> addresses of different prefixes assigned to it.
> 
> In this situation, running pasta to create an isolated netns prints
> "Multiple interfaces with %s routes, picked first", even though there
> is in fact only one candidate interface.
> 
> Reproducer:
> 
>   sudo ip link add dummy42 type dummy
>   sudo ip link set dev dummy42 up
>   sudo ip addr add fdaa:aaaa:aaaa::1/64 dev dummy42
>   sudo ip addr add fdbb:bbbb:bbbb::1/64 dev dummy42
> 
>   pasta --config-net -- true
> 
> This message is meant to indicate that there are multiple candidate
> interfaces, but in fact there is only one, which can mislead users.
> 
> Therefore, avoid printing this message when there are multiple non-default
> routes that all belong to the same interface.
> 
> Fixes: 450a6131beab ("netlink: With no default route, pick the first interface with a route")
> Signed-off-by: Hayato Kiwata <dev@haytok.jp>

Applied, thanks, and sorry for the delay!

-- 
Stefano