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"ip tun add" fails with wrong error if remote is not specified: root@rhel8:~# ip tun add grezz0 mode gre add tunnel "gre0" failed: File exists if the remote is specified, the tunnel creation works: root@rhel8:~# ip tun add grezz0 mode gre remote 1.2.3.4 root@rhel8:~# ip link show dev grezz0 6: grezz0@NONE: <POINTOPOINT,NOARP> mtu 1476 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/gre 0.0.0.0 peer 1.2.3.4