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Date: Mon, 19 Aug 1996 19:33:14 +0000 ()
From: Andreas Mutschlechner <andi@fap.dnet.it>
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To: Tushar Patel <tushar@ecpi.com>
cc: freebsd-isp@freebsd.org
Subject: Re: tun device problem more info
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On Fri, 16 Aug 1996, Tushar Patel wrote:

> Hi,
> 
> I did some more experiment on the "/dev/MAKEDEV" and
> I managed to get
> 
> crw-------  1 uucp  dialer   52,  10 Aug 16 23:19 tuna
>                                  ^^^             
>                                 correct minor number
> 
> I have correct minor number, but it has same problem
> 
> "No tunnel device is available"
> "open_tun: Device_busy"
> 
> By any chance this could be related to the fact that
> I have "maxusers 10" in the generic KERNEL configuration?
> 
> Please help me.
> 
Time ago there was a bug report about this. The problem is ppp itself.
The function OpenTunnel in os.c has some flaws:

int
OpenTunnel(ptun)
int *ptun;
{
  int s;
  char *cp;
  char *suffix = "0123456789"; <----- gives max tun9
  char ifname[IFNAMSIZ];
  char devname[12];

  strcpy(devname, "/dev/tun0");
  for (cp = suffix; *cp; cp++) {
    devname[8] = *cp;
    tun_out = open(devname, O_RDWR);
    if (tun_out >= 0)
      break;
  }
  ---SNIP-----

Hope this helps.

greets
andi