OpenVPN did not created a tun0 interface

Can you give the output of:

sudo lshw -C network; cat /etc/lsb-release; uname -a; ifconfig; route

Thanks

root@oldibm:~# sudo lshw -C network; cat /etc/lsb-release; uname -a; ifconfig; route
  *-network
       description: Ethernet interface
       product: NetXtreme BCM5721 Gigabit Ethernet PCI Express
       vendor: Broadcom Corporation
       physical id: 0
       bus info: pci@0000:01:00.0
       logical name: eth0
       version: 11
       serial: 00:14:5e:46:8b:bd
       size: 1Gbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm vpd msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.121 duplex=full firmware=5721-v3.29a ip=192.168.0.10 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
       resources: irq:16 memory:d0100000-d010ffff
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Ubuntu 12.04.1 LTS"
Linux oldibm 3.2.0-29-generic-pae #46-Ubuntu SMP Fri Jul 27 17:25:43 UTC 2012 i686 i686 i386 GNU/Linux
eth0 Link encap:Ethernet HWaddr 00:14:5e:46:8b:bd
          inet addr:192.168.0.10 Bcast:192.168.0.255 Mask:255.255.255.0
          inet6 addr: fe80::214:5eff:fe46:8bbd/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:9457 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7012 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:8741402 (8.7 MB) TX bytes:852611 (852.6 KB)
          Interrupt:16

lo Link encap:Local Loopback
          inet addr:127.0.0.1 Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING MTU:16436 Metric:1
          RX packets:2 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:158 (158.0 B) TX bytes:158 (158.0 B)

Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface

Have you established the VPN link?

I am just following the instruction in the ubuntu site on how to install openvpn and on the the last part of the server configuration.

Now check if OpenVPN created a tun0 interface:

root@server:/etc/openvpn# ifconfig tun0
tun0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          inet addr:10.8.0.1 P-t-P:10.8.0.2 Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
[...]

this part of server configuration...

May be I have not yet establish VPN link. not sure..

lyndon@oldibm:~$ sudo lshw -C network; cat /etc/lsb-release; uname -a; ifconfig; route
[sudo] password for lyndon:
  *-network
       description: Ethernet interface
       product: NetXtreme BCM5721 Gigabit Ethernet PCI Express
       vendor: Broadcom Corporation
       physical id: 0
       bus info: pci@0000:01:00.0
       logical name: eth0
       version: 11
       serial: 00:14:5e:46:8b:bd
       size: 1Gbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm vpd msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.121 duplex=full firmware=5721-v3.29a ip=192.168.0.10 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
       resources: irq:16 memory:d0100000-d010ffff
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Ubuntu 12.04.1 LTS"
Linux oldibm 3.2.0-29-generic-pae #46-Ubuntu SMP Fri Jul 27 17:25:43 UTC 2012 i686 i686 i386 GNU/Linux

I think i solve the problem..do i?
eth0 Link encap:Ethernet HWaddr 00:14:5e:46:8b:bd
          inet addr:192.168.0.10 Bcast:192.168.0.255 Mask:255.255.255.0
          inet6 addr: fe80::214:5eff:fe46:8bbd/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:628 errors:0 dropped:0 overruns:0 frame:0
          TX packets:824 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:307959 (307.9 KB) TX bytes:118323 (118.3 KB)
          Interrupt:16

lo Link encap:Local Loopback
          inet addr:127.0.0.1 Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING MTU:16436 Metric:1
          RX packets:2 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:158 (158.0 B) TX bytes:158 (158.0 B)

tun0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          inet addr:10.8.0.1 P-t-P:10.8.0.2 Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:0 (0.0 B) TX bytes:220 (220.0 B)

Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 192.168.0.1 0.0.0.0 UG 100 0 0 eth0
10.8.0.0 10.8.0.2 255.255.255.0 UG 0 0 0 tun0
10.8.0.2 * 255.255.255.255 UH 0 0 0 tun0
link-local * 255.255.0.0 U 1000 0 0 eth0
192.168.0.0 * 255.255.255.0 U 0 0 0 eth0
lyndon@oldibm:~$