openssh bugs - Nov 2019 - [Bug 3088] New: sys_tun_open: failed to open tunnel control interface: No such device

https://bugzilla.mindrot.org/show_bug.cgi?id=3088

            Bug ID: 3088
           Summary: sys_tun_open: failed to open tunnel control interface:
                    No such device
           Product: Portable OpenSSH
           Version: 8.0p1
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: sshd
          Assignee: unassigned-bugs at mindrot.org
          Reporter: tjbryant at gmail.com

I've tried this on four different servers running versions from 7 to
8.0p1-3. All the servers were running linux. I tried it on x86_64, x86,
and MIPS and get the same error each time. This is the command line
that I am using:

$ sudo ssh -v -w 1:1 -o Tunnel=ethernet root at 192.168.1.1
...
debug1: Requesting tun unit 1 in mode 1
debug1: sys_tun_open: failed to open tunnel control interface: No such
device
Tunnel device open failed.
Could not request tunnel forwarding.
...

It logs me in and brings me to the prompt, but tap1 doesn't exist on
the remote or local server.

-- 
You are receiving this mail because:
You are watching the assignee of the bug.

https://bugzilla.mindrot.org/show_bug.cgi?id=3088

Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |djm at mindrot.org
         Resolution|---                         |WORKSFORME
             Status|NEW                         |RESOLVED

--- Comment #1 from Damien Miller <djm at mindrot.org> ---
This problem is caused by the /dev/net/tun device being missing on your
server. On Linux this may be caused by the support being compiled out
of the kernel and/or the necessary kernel module not being loaded. You
might try "modprobe tun" and/or adding "tun" to
/etc/modules.

I've committed a change to improve the error message for this case by
making it include the device name that it failed to open, but the your
problem needs to be solved on your server.

-- 
You are receiving this mail because:
You are watching the assignee of the bug.
You are watching someone on the CC list of the bug.

https://bugzilla.mindrot.org/show_bug.cgi?id=3088

Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

--- Comment #2 from Damien Miller <djm at mindrot.org> ---
close bugs that were resolved in OpenSSH 8.5 release cycle

-- 
You are receiving this mail because:
You are watching someone on the CC list of the bug.
You are watching the assignee of the bug.