port-evbarm/50799: cannot creat tun0

[moeckel.johannes%gmail.com@localhost]

>Number:         50799
>Category:       port-evbarm
>Synopsis:       cannot creat tun0
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    port-evbarm-maintainer
>State:          open
>Class:          support
>Submitter-Id:   net
>Arrival-Date:   Fri Feb 12 20:30:00 +0000 2016
>Originator:     Johannes Möckel
>Release:        7.0_STABLE NetBSD 7.0_STABLE (RPI2.201601311330Z)
>Organization:
>Environment:
NetBSD thanatos2.myth 7.0_STABLE NetBSD 7.0_STABLE (RPI2.201601311330Z) evbarm
>Description:
'openvpn start' fails with
Cannot allocate TUN/TAP dev dynamically

# ifconfig tun0 create
ifconfig: clone_command: Invalid argument
ifconfig: exec_matches: Invalid argument

I tried this on a virtual box running NetBSD x86 and I was able to create tun0, I cannot tell the difference between these two installation, maybe because I am very now to NetBSD. Searching on the WWW did not get me any further.
>How-To-Repeat:
It occured on NetBSD RPI2.201601311330Z on RaspberryPi 2 using
the commands above
>Fix: