[Solved] Linux ip link set failed: could not execute external program

anam0131

When I try to connect to open vpn. I get the following error:

Tue Oct 17 09:16:46 2017 OpenVPN 2.3.10 x86_64-pc-linux-gnu [SSL (OpenSSL)] [LZO] [EPOLL] [PKCS11] [MH] [IPv6] built on Jun 22 2017
Tue Oct 17 09:16:46 2017 library versions: OpenSSL 1.0.2g  1 Mar 2016, LZO 2.08
Tue Oct 17 09:16:46 2017 NOTE: the current --script-security setting may allow this configuration to call user-defined scripts
Tue Oct 17 09:16:46 2017 Control Channel Authentication: tls-auth using INLINE static key file
Tue Oct 17 09:16:46 2017 Outgoing Control Channel Authentication: Using 160 bit message hash 'SHA1' for HMAC authentication
Tue Oct 17 09:16:46 2017 Incoming Control Channel Authentication: Using 160 bit message hash 'SHA1' for HMAC authentication
Tue Oct 17 09:16:47 2017 UDPv4 link local: [undef]
Tue Oct 17 09:16:47 2017 UDPv4 link remote: [AF_INET]195.171.27.243:11859
Tue Oct 17 09:16:49 2017 VERIFY OK: depth=1, O=5939642535dfccf54d547c46, CN=5939642535dfccf54d547c4b
Tue Oct 17 09:16:49 2017 Validating certificate key usage
Tue Oct 17 09:16:49 2017 ++ Certificate has key usage  00a0, expects 00a0
Tue Oct 17 09:16:49 2017 NOTE: --mute triggered...
Tue Oct 17 09:16:51 2017 10 variation(s) on previous 3 message(s) suppressed by --mute
Tue Oct 17 09:16:51 2017 [5939642735dfccf54d547c56] Peer Connection Initiated with [AF_INET]195.171.27.243:11859
Tue Oct 17 09:16:55 2017 TUN/TAP device tun0 opened
Tue Oct 17 09:16:55 2017 do_ifconfig, tt->ipv6=0, tt->did_ifconfig_ipv6_setup=0
Tue Oct 17 09:16:55 2017 /sbin/ip link set dev tun0 up mtu 1500
Tue Oct 17 09:16:55 2017 Linux ip link set failed: could not execute external program
Tue Oct 17 09:16:55 2017 Exiting due to fatal erro

I have no idea which external program it is referring to. I tried connecting using a different laptop and windows and it worked.

I have a feeling this is related to my resolv conf file not working correctly. I had to create a static interface for my internet to work properly
Please help, I am going crazy 🙁

TinCanTech

anam0131 wrote Tue Oct 17 09:16:55 2017 /sbin/ip link set dev tun0 up mtu 1500
Tue Oct 17 09:16:55 2017 Linux ip link set failed: could not execute external program

You have iproute2 installed ? .. try running "ip route"

anam0131

duplicate post

Admin please remove

anam0131

duplicate post

removed apologies

anam0131

Yes, I do. Seems like I cannot post here without admin approval. In that case apologies for multiple posts

Output:

default via 192.168.8.1 dev enx0c5b8f279a64  proto static  metric 100 
default via 192.168.8.1 dev wlp1s0  proto static  metric 600 
172.17.0.0/16 dev docker0  proto kernel  scope link  src 172.17.0.1 linkdown 
172.27.224.0/23 dev as0t0  proto kernel  scope link  src 172.27.224.1 
172.27.226.0/23 dev as0t1  proto kernel  scope link  src 172.27.226.1 
172.27.228.0/23 dev as0t2  proto kernel  scope link  src 172.27.228.1 
172.27.230.0/23 dev as0t3  proto kernel  scope link  src 172.27.230.1 
172.27.232.0/23 dev as0t4  proto kernel  scope link  src 172.27.232.1 
172.27.234.0/23 dev as0t5  proto kernel  scope link  src 172.27.234.1 
172.27.236.0/23 dev as0t6  proto kernel  scope link  src 172.27.236.1 
172.27.238.0/23 dev as0t7  proto kernel  scope link  src 172.27.238.1 
192.168.8.0/24 dev enx0c5b8f279a64  proto kernel  scope link  src 192.168.8.100  metric 100 
192.168.8.0/24 dev wlp1s0  proto kernel  scope link  src 192.168.8.101  metric 600

TinCanTech

anam0131 wrote 172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown
172.27.224.0/23 dev as0t0 proto kernel scope link src 172.27.224.1

Maybe your docker does not have /dev/net/tun .. also as0t is related to OpenVPN Access Server ..

I don't know what you have setup ..

anam0131

Maybe your docker does not have /dev/net/tun .. also as0t is related to OpenVPN Access Server ..

Thank you for the prompt reply.

I was trying different things and just installed Open VPN Access Server. I am not using it

I have docker setup for deploying web app development https://www.docker.com/what-container

I can see in the logs that tun0 is opened

Tue Oct 17 14:08:03 2017 TUN/TAP device tun0 opened

anam0131

➜   /sbin/ip link set dev tun0 up mtu 1500 
zsh: exec format error: /sbin/ip

looks like its corrupted. How can I reinstall

anam0131

ok, The script is using

➜  /sbin/ip link set dev tun0 up mtu 1500
zsh: exec format error: /sbin/ip

which does not work

It is supposed to work with ip

➜   ip link set dev tun0 up mtu 1500 
Cannot find device "tun0"

anam0131

Thanks you very much TinCanTech. `/sbin/ip` was corrupted .