[Solved]Openvpn client on windows works, for linux not

iveseenyouyawn

Hi all,

been using openvpn on a customized asus modem as server and as client on windows pc.
This has been working for quite some time without any issue at all.

Now, I would like to use the same configuration but with a linux client.

Debian 8, Openvpn is installed.
Through launching the same open vpn this is the log:

Wed May 6 21:47:26 2015 us=954998 PUSH: Received control message: 'PUSH_REPLY,route 192.168.2.0 255.255.255.0,redirect-gateway def1,route 192.168.3.1,topology net30,ping 15,ping-restart 60,ifconfig 192.168.3.6 192.168.3.5'
Wed May 6 21:47:26 2015 us=955054 OPTIONS IMPORT: timers and/or timeouts modified
Wed May 6 21:47:26 2015 us=955061 OPTIONS IMPORT: --ifconfig/up options modified
Wed May 6 21:47:26 2015 us=955065 OPTIONS IMPORT: route options modified
Wed May 6 21:47:26 2015 us=955075 WARNING: Since you are using --dev tap, the second argument to --ifconfig must be a netmask, for example something like 255.255.255.0. (silence this warning with --ifconfig-nowarn)
Wed May 6 21:47:26 2015 us=955195 ROUTE_GATEWAY 192.168.100.1/255.255.255.0 IFACE=wlan0 HWADDR=XX:XX:XX:XX:XX:XX
Wed May 6 21:47:26 2015 us=955204 OpenVPN ROUTE: OpenVPN needs a gateway parameter for a --route option and no default was specified by either --route-gateway or --ifconfig options
Wed May 6 21:47:26 2015 us=955210 OpenVPN ROUTE: failed to parse/resolve route for host/network: 192.168.2.0

The connection never starts.

On Windows, the openvpn virtual interface gets an ip address(192.168.3.5) from dhcp of the openvpn server (192.168.3.6).
I seem to understand the issue is on IP side, but I can't grasp what's the difference in the configuration, as I copied over the ovpn file and made adjustments to the folders of ca and crt files only.

I just tried another openvpn server which is a debian server, with a tun configuration and it's perfectly working.

This is the client.ovpn

remote my.remote.openvpnserver 1194

client

dev tap0

proto tcp

resolv-retry infinite

# nobind

comp-lzo

persist-key

persist-tun

float

ca ca.crt

cert client1.crt

key client1.key

ns-cert-type server

verb 5

Thanks in advance to anybody who might suggest a solution

maikcat

which version of openvpn is installed on your linux?

Michael.

iveseenyouyawn

maikcat wrotewhich version of openvpn is installed on your linux?

Michael.

I quote from openvpn --version

"OpenVPN 2.3.4 x86_64-pc-linux-gnu [SSL (OpenSSL)] [LZO] [EPOLL] [PKCS11] [MH] [IPv6] built on Dec 1 2014
library versions: OpenSSL 1.0.1k 8 Jan 2015, LZO 2.08 "

I tested the same machine, same openvpn client towards a different openvpn server, sitting on a debian x64 server.
It works perfectly, I just copied ca, key and .conf from Windows machine and voilà!

Thanks

maikcat

Wed May 6 21:47:26 2015 us=954998 PUSH: Received control message: 'PUSH_REPLY,route 192.168.2.0 255.255.255.0,redirect-gateway def1,route 192.168.3.1,topology net30,ping 15,ping-restart 60,ifconfig 192.168.3.6 192.168.3.5'

this tells me that the remote side is using dev tun,
can you verify that?

Michael.

iveseenyouyawn

maikcat wrote
Wed May 6 21:47:26 2015 us=954998 PUSH: Received control message: 'PUSH_REPLY,route 192.168.2.0 255.255.255.0,redirect-gateway def1,route 192.168.3.1,topology net30,ping 15,ping-restart 60,ifconfig 192.168.3.6 192.168.3.5'
this tells me that the remote side is using dev tun,
can you verify that?

Michael.

Your hypothesis is 100% correct, reverted config to tun, working as expected.
Thank you very much

maikcat

You welcome,

marked as solved

Closing topic

Michael.