netdev - Re: [iproute2] Can't create ip6 tunnel device

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Date:   Tue, 2 Jul 2019 18:26:23 +0800
From:   Ji Jianwen <jijianwen@...il.com>
To:     netdev@...r.kernel.org
Cc:     stephen@...workplumber.org, maheshb@...gle.com
Subject: Re: [iproute2] Can't create ip6 tunnel device

It seems this issue was introduced by commit below, I am able to run
the command successfully mentioned at previous mail without it.

commit ba126dcad20e6d0e472586541d78bdd1ac4f1123 (HEAD)
Author: Mahesh Bandewar <maheshb@...gle.com>
Date:   Thu Jun 6 16:44:26 2019 -0700

    ip6tunnel: fix 'ip -6 {show|change} dev <name>' cmds

On Tue, Jul 2, 2019 at 2:53 PM Ji Jianwen <jijianwen@...il.com> wrote:
>
> Hello  there,
>
> I got error when creating ip6 tunnel device on a rhel-8.0.0 system.
>
> Here are the steps to reproduce the issue.
> # # uname -r
> 4.18.0-80.el8.x86_64
> # dnf install -y libcap-devel bison flex git gcc
> # git clone git://git.kernel.org/pub/scm/network/iproute2/iproute2.git
> # cd iproute2  &&  git log --pretty=oneline --abbrev-commit
> d0272f54 (HEAD -> master, origin/master, origin/HEAD) devlink: fix
> libc and kernel headers collision
> ee09370a devlink: fix format string warning for 32bit targets
> 68c46872 ip address: do not set mngtmpaddr option for IPv4 addresses
> e4448b6c ip address: do not set home option for IPv4 addresses
> ....
>
> # ./configure && make && make install
> # ip -6 tunnel add ip6tnl1 mode ip6ip6 remote 2001:db8:ffff:100::2
> local 2001:db8:ffff:100::1 hoplimit 1 tclass 0x0 dev eno1   --->
> please replace eno1 with the network card name of your system
> add tunnel "ip6tnl0" failed: File exists
>
> Please help take a look. Thanks!
>
> Br,
> Jianwen