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[Openvpn-users] trouble with tun/tap driver


  • Subject: [Openvpn-users] trouble with tun/tap driver
  • From: Sean Langford <me@xxxxxxxxxxxxxxxx>
  • Date: Fri, 26 Apr 2002 18:25:05 -0400

Hello,

Trying to use openvpn and keep running into the following message:

[root@sjl openvpn-1.1.1]# ./openvpn --remote sjl --dev tun0 --ifconfig 10.4.0.1 10.4.0.2 --verb 8 --mktun
.....
34: Cannot open TUN/TAP dev /dev/tun0: No such file or directory (errno=2)
35: Exiting


Openvpn can never seem to find any tun devices. I've also tried "--dev net/tun" and "--dev /dev/net/tun0" and "--dev tun7" and always get the same result. I am running kernel 2.4.16, and have the tun/tap module installed. I've also created /dev/net/tun, and added the appropriate line into my modules.conf as outlined in the tun/tap module documentation. I'm trying this as root.

Ifconfig also fails:

[root@sjl openvpn-1.1.1]# ifconfig tun0 10.1.0.7 pointopoint 10.1.0.8 mtu 1450
SIOCSIFADDR: No such device
tun0: unknown interface: No such device
SIOCSIFDSTADDR: No such device
tun0: unknown interface: No such device
SIOCSIFMTU: No such device



I noticed there used to be a "--mktun" flag, but that doesnt seem to be working for me either. What am I doing wrong?


Thanks!

Sean


full output below:

[root@sjl openvpn-1.1.1]# ./openvpn --remote sjl --dev tun0 --ifconfig 10.4.0.1 10.4.0.2 --verb 8 --mktun
0: Current Parameter Settings:
1: local = '(null)'
2: remote = 'sjl'
3: local_port = 5000
4: remote_port = 5000
5: remote_float = DISABLED
6: ipchange = '(null)'
7: bind_local = ENABLED
8: dev = 'tun0'
9: ifconfig_local = '10.4.0.1'
10: ifconfig_remote = '10.4.0.2'
11: shaper = 0
12: tun_mtu = 1450
13: tun_mtu_defined = DISABLED
14: udp_mtu = 1500
15: udp_mtu_defined = ENABLED
16: tun_af_inet = DISABLED
17: mlock = DISABLED
18: inactivity_timeout = 0
19: ping_send_timeout = 0
20: ping_rec_timeout = 0
21: username = '(null)'
22: chroot_dir = '(null)'
23: up_script = '(null)'
24: down_script = '(null)'
25: daemon = DISABLED
26: nice = 0
27: verbosity = 8
28: gremlin = DISABLED
29: OpenVPN 1.1.1 Built On Apr 26 2002
30: UDP link local (bound): [undef]
31: UDP link remote: 10.50.4.125
32: ******* WARNING *******: OpenVPN built without OpenSSL -- encryption and authentication features disabled -- all data will be tunnelled as cleartext
33: Data Channel MTU parms: mtu=1500 extra_frame=0 extra_buffer=0 extra_tun=0
34: Cannot open TUN/TAP dev /dev/tun0: No such file or directory (errno=2)
35: Exiting






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