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

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Message-ID: <CAGWhr0AOApbf4-4RJHibUaKa8MmOfGS+uH6Rx4x1PQGZXRbCOQ@mail.gmail.com>
Date:   Tue, 2 Jul 2019 14:53:07 +0800
From:   Ji Jianwen <jijianwen@...il.com>
To:     netdev@...r.kernel.org
Cc:     stephen@...workplumber.org
Subject: [iproute2] Can't create ip6 tunnel device

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