I've installed openvpn on a debian VPS & configured it as you see below:
port 1194 proto udp dev tun ifconfig 10.0.2.21 10.0.2.22 ifconfig-noexec route-noexec keepalive 10 120 persist-key persist-tun comp-lzo verb 3 #fragment 1200 mssfix 1200 #reneg-sec 0 push "dhcp-option DNS 220.127.116.11" push "dhcp-option DNS 18.104.22.168" tls-server tls-auth static.key 0 ca RastakCA.crt cert ovpn.crt key ovpn.key dh ovpn_dh2048.pem cipher BF-CBC # Blowfish (default) cipher AES-128-CBC # AES cipher DES-EDE3-CBC # Triple-DES status openvpn-status.log log openvpn.log ;log-append openvpn.log
& here is the client config:
client dev tun proto udp remote a.b.c.d ifconfig 10.0.2.22 10.0.2.21 redirect-gateway def1 tls-client tls-auth static.key 1 ca CA.crt cert ovpn_client.crt key ovpn_client.key cipher BF-CBC # Blowfish (default) cipher AES-128-CBC # AES cipher DES-EDE3-CBC # Triple-DES comp-lzo #fragment 1200 #reneg-sec 0 mssfix 1200 verb 3
now when I connect to it on windows (with openvpn-gui client) everything is OK, but when I use same client config to connect in an android device (using openvpn connect), I get following warning at server side:
Sat Jan 10 22:23:53 2015 WARNING: 'ifconfig' is present in local config but missing in remote config, local='ifconfig 10.0.2.21 10.0.2.22'
& also following error at client side:
Tun interface setup failed: tun_builder_error: one of ifconfig or ifconfig-ipv6 must be specified
I added following line to server config file & I succeed to connect using both windows and android clinets:
push "ifconfig 10.0.2.22 10.0.2.21"
but there is still another problem: when I disconnect manually in android device, server process dies with these lines of log:
Sat Jan 10 23:30:44 2015 TCP/UDP: Closing socket Sat Jan 10 23:30:44 2015 Closing TUN/TAP interface Sat Jan 10 23:30:44 2015 SIGTERM[soft,remote-exit] received, process exiting
& I have to restart server daemon again (in the windows client I've no problem after disconnecting manually & also I've no problem with android device when connection loses without disconnecting).