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Stefan van den Akker's questions

Martin Hope
Stefan van den Akker
Asked: 2014-02-01 11:13:05 +0800 CST
  • 3

I'm trying to set up an OpenVPN server on my PC. I have followed the steps described here.

My server configuration file looks like this:

local 192.168.1.150
port 1194
dev tun
ifconfig 10.8.0.1 10.8.0.2
secret static.key

My client configurattion file looks like this:

remote A.B.C.D # this is my public IP address, is that correct?
port 1194
dev tun
ifconfig 10.8.0.2 10.8.0.1
secret static.key

When I start my server and client, the client gives the following:

Fri Jan 31 20:04:27 2014 OpenVPN 2.2.1 x86_64-linux-gnu [SSL] [LZO2] [EPOLL] [PKCS11] [eurephia] [MH] [PF_INET6] [IPv6 payload 20110424-2 (2.2RC2)] built on Feb 27 2013
Fri Jan 31 20:04:27 2014 NOTE: OpenVPN 2.1 requires '--script-security 2' or higher to call user-defined scripts or executables
Fri Jan 31 20:04:27 2014 WARNING: file 'static.key' is group or others accessible
Fri Jan 31 20:04:27 2014 Static Encrypt: Cipher 'BF-CBC' initialized with 128 bit key
Fri Jan 31 20:04:27 2014 Static Encrypt: Using 160 bit message hash 'SHA1' for HMAC authentication
Fri Jan 31 20:04:27 2014 Static Decrypt: Cipher 'BF-CBC' initialized with 128 bit key
Fri Jan 31 20:04:27 2014 Static Decrypt: Using 160 bit message hash 'SHA1' for HMAC authentication
Fri Jan 31 20:04:27 2014 Socket Buffers: R=[229376->131072] S=[229376->131072]
Fri Jan 31 20:04:27 2014 TUN/TAP device tun0 opened
Fri Jan 31 20:04:27 2014 TUN/TAP TX queue length set to 100
Fri Jan 31 20:04:27 2014 do_ifconfig, tt->ipv6=0, tt->did_ifconfig_ipv6_setup=0
Fri Jan 31 20:04:27 2014 /sbin/ifconfig tun0 10.8.0.2 pointopoint 10.8.0.1 mtu 1500
Fri Jan 31 20:04:27 2014 Data Channel MTU parms [ L:1544 D:1450 EF:44 EB:4 ET:0 EL:0 ]
Fri Jan 31 20:04:27 2014 Local Options hash (VER=V4): 'd3880969'
Fri Jan 31 20:04:27 2014 Expected Remote Options hash (VER=V4): 'c41bf3b8'
Fri Jan 31 20:04:27 2014 UDPv4 link local (bound): [undef]
Fri Jan 31 20:04:27 2014 UDPv4 link remote: [AF_INET]A.B.C.D:1194
Fri Jan 31 20:04:37 2014 read UDPv4 [ECONNREFUSED]: Connection refused (code=111)

I added a rule to my ufw to allow all incoming traffic to port 1194.

I also added a rule to my router's firewall, to allow all incoming traffic to port 1194.

I use a static IP address 192.168.1.150.

I tried turning off both firewalls to see if that would make it work, but no results.

Is there any reason why my client can't connect to my server? Notice I connect to my public IP address, is this correct? Or should it be something else?

EDIT:

Log of the server (verb 3):

Fri Jan 31 23:01:54 2014 OpenVPN 2.2.1 x86_64-linux-gnu [SSL] [LZO2] [EPOLL] [PKCS11] [eurephia] [MH] [PF_INET6] [IPv6 payload 20110424-2 (2.2RC2)] built on Feb 27 2013
Fri Jan 31 23:01:54 2014 WARNING: you are using user/group/chroot/setcon without persist-tun -- this may cause restarts to fail
Fri Jan 31 23:01:54 2014 WARNING: you are using user/group/chroot/setcon without persist-key -- this may cause restarts to fail
Fri Jan 31 23:01:54 2014 NOTE: OpenVPN 2.1 requires '--script-security 2' or higher to call user-defined scripts or executables
Fri Jan 31 23:01:54 2014 Static Encrypt: Cipher 'BF-CBC' initialized with 128 bit key
Fri Jan 31 23:01:54 2014 Static Encrypt: Using 160 bit message hash 'SHA1' for HMAC authentication
Fri Jan 31 23:01:54 2014 Static Decrypt: Cipher 'BF-CBC' initialized with 128 bit key
Fri Jan 31 23:01:54 2014 Static Decrypt: Using 160 bit message hash 'SHA1' for HMAC authentication
Fri Jan 31 23:01:54 2014 Socket Buffers: R=[229376->131072] S=[229376->131072]
Fri Jan 31 23:01:54 2014 TUN/TAP device tun0 opened
Fri Jan 31 23:01:54 2014 TUN/TAP TX queue length set to 100
Fri Jan 31 23:01:54 2014 do_ifconfig, tt->ipv6=0, tt->did_ifconfig_ipv6_setup=0
Fri Jan 31 23:01:54 2014 /sbin/ifconfig tun0 10.8.0.1 pointopoint 10.8.0.2 mtu 1500
Fri Jan 31 23:01:54 2014 Data Channel MTU parms [ L:1544 D:1450 EF:44 EB:4 ET:0 EL:0 ]
Fri Jan 31 23:01:54 2014 Local Options hash (VER=V4): 'c41bf3b8'
Fri Jan 31 23:01:54 2014 Expected Remote Options hash (VER=V4): 'd3880969'
Fri Jan 31 23:01:54 2014 GID set to neftas
Fri Jan 31 23:01:54 2014 UID set to neftas
Fri Jan 31 23:01:54 2014 UDPv4 link local (bound): [AF_INET]192.168.1.150:1194
Fri Jan 31 23:01:54 2014 UDPv4 link remote: [undef]
openvpn
Martin Hope
Stefan van den Akker
Asked: 2014-01-26 02:51:39 +0800 CST
  • 3

When I use the interactive Python interpreter, the width of the tabs seem out of sync with each other.

Specifically, the first tab gives me a tab width equivalent to 4 spaces, while the next tabs are 8 spaces wide.

Example

Is there a configuration file that I need to change, or some environment variable that needs to be set?

I'm using Python 2.7.3 on elementary OS 0.2 'Luna', but I also had the same problem when using the Python interpreter in Ubuntu 13.04 (Python version 2.7.5, I think).

python
Martin Hope
Stefan van den Akker
Asked: 2013-10-16 11:25:01 +0800 CST
  • 44

I am planning on selling my laptop. So I formatted my disk using the Disk Utility and chose to overwrite the disk with zeroes.

Two questions:

Is this the same as overwriting the disk using dd?

sudo dd if=/dev/zero of=/dev/sda

And is this method secure enough so that buyers can't easily recover the previous data? Or should I take additional measures (like encrypting the disk, destroying the headers, etc.)?

disk-utility