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Date:      Thu, 19 Apr 2018 14:03:17 +0700
From:      Eugene Grosbein <eugen@grosbein.net>
To:        Akilan Elango <akilan1997@gmail.com>, freebsd-net@freebsd.org
Subject:   Re: max devices in tun
Message-ID:  <5AD83F35.5060402@grosbein.net>
In-Reply-To: <CABTkBy_7QpX8F%2B5bai-BXtLbZGEXcgfh69-8Ni%2Bk_apBq4t-SQ@mail.gmail.com>
References:  <CABTkBy_7QpX8F%2B5bai-BXtLbZGEXcgfh69-8Ni%2Bk_apBq4t-SQ@mail.gmail.com>

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19.04.2018 7:29, Akilan Elango wrote:

> Hey guys,
>     I was fiddling around with the /dev/tun to write a TUN interface
> for my app. I wanted to check what is the max amount of interfaces
> that can be made. Turned out it was 32768 [0 - 32768). But when I
> created (ifconfig tun32768 create), a weird device appeared as shown
> in this figure : https://imgur.com/a/0ypbwgg.
> 
> Is this expected? and I'm unable to delete the device too from ifconfig.

You should tell what FreeBSD version do you use.
It does not do so for my 11.1/i386:

# ifconfig tun32768 create
ifconfig: SIOCIFCREATE2: No space left on device




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