V4bgbEeq 0 Posted ... I am experiencing something strange when I try to connect my Ubuntu server to the service.Log: user@ubuntu:~$ sudo openvpn --config AirVPN_GB-London_Bellatrix_UDP-443.ovpn [sudo] password for user: Sun Jun 25 20:37:13 2017 OpenVPN 2.3.10 x86_64-pc-linux-gnu [SSL (OpenSSL)] [LZO] [EPOLL] [PKCS11] [MH] [IPv6] built on Jun 22 2017 Sun Jun 25 20:37:13 2017 library versions: OpenSSL 1.0.2g 1 Mar 2016, LZO 2.08 Sun Jun 25 20:37:13 2017 Control Channel Authentication: tls-auth using INLINE static key file Sun Jun 25 20:37:13 2017 Outgoing Control Channel Authentication: Using 160 bit message hash 'SHA1' for HMAC authentication Sun Jun 25 20:37:13 2017 Incoming Control Channel Authentication: Using 160 bit message hash 'SHA1' for HMAC authentication Sun Jun 25 20:37:13 2017 Socket Buffers: R=[212992->212992] S=[212992->212992] Sun Jun 25 20:37:13 2017 UDPv4 link local: [undef] Sun Jun 25 20:37:13 2017 UDPv4 link remote: [AF_INET]88.150.240.7:443 Sun Jun 25 20:37:13 2017 TLS: Initial packet from [AF_INET]88.150.240.7:443, sid=43e3bb88 272c22d6 Sun Jun 25 20:37:13 2017 VERIFY OK: depth=1, C=IT, ST=IT, L=Perugia, O=airvpn.org, CN=airvpn.org CA, emailAddress=info@airvpn.org Sun Jun 25 20:37:13 2017 Validating certificate key usage Sun Jun 25 20:37:13 2017 ++ Certificate has key usage 00a0, expects 00a0 Sun Jun 25 20:37:13 2017 VERIFY KU OK Sun Jun 25 20:37:13 2017 Validating certificate extended key usage Sun Jun 25 20:37:13 2017 ++ Certificate has EKU (str) TLS Web Server Authentication, expects TLS Web Server Authentication Sun Jun 25 20:37:13 2017 VERIFY EKU OK Sun Jun 25 20:37:13 2017 VERIFY OK: depth=0, C=IT, ST=IT, L=Perugia, O=airvpn.org, CN=server, emailAddress=info@airvpn.org Sun Jun 25 20:37:13 2017 Data Channel Encrypt: Cipher 'AES-256-CBC' initialized with 256 bit key Sun Jun 25 20:37:13 2017 Data Channel Encrypt: Using 160 bit message hash 'SHA1' for HMAC authentication Sun Jun 25 20:37:13 2017 Data Channel Decrypt: Cipher 'AES-256-CBC' initialized with 256 bit key Sun Jun 25 20:37:13 2017 Data Channel Decrypt: Using 160 bit message hash 'SHA1' for HMAC authentication Sun Jun 25 20:37:13 2017 Control Channel: TLSv1.2, cipher TLSv1/SSLv3 DHE-RSA-AES256-GCM-SHA384, 4096 bit RSA Sun Jun 25 20:37:13 2017 [server] Peer Connection Initiated with [AF_INET]88.150.240.7:443 Sun Jun 25 20:37:15 2017 SENT CONTROL [server]: 'PUSH_REQUEST' (status=1) Sun Jun 25 20:37:15 2017 PUSH: Received control message: 'PUSH_REPLY,redirect-gateway def1 bypass-dhcp,dhcp-option DNS 10.4.0.1,comp-lzo no,route-gateway 10.4.0.1,topology subnet,ping 10,ping-restart 60,ifconfig 10.4.4.110 255.255.0.0' Sun Jun 25 20:37:15 2017 OPTIONS IMPORT: timers and/or timeouts modified Sun Jun 25 20:37:15 2017 OPTIONS IMPORT: LZO parms modified Sun Jun 25 20:37:15 2017 OPTIONS IMPORT: --ifconfig/up options modified Sun Jun 25 20:37:15 2017 OPTIONS IMPORT: route options modified Sun Jun 25 20:37:15 2017 OPTIONS IMPORT: route-related options modified Sun Jun 25 20:37:15 2017 OPTIONS IMPORT: --ip-win32 and/or --dhcp-option options modified Sun Jun 25 20:37:15 2017 ROUTE_GATEWAY 94.23.43.254 Sun Jun 25 20:37:15 2017 TUN/TAP device tun1 opened Sun Jun 25 20:37:15 2017 TUN/TAP TX queue length set to 100 Sun Jun 25 20:37:15 2017 do_ifconfig, tt->ipv6=0, tt->did_ifconfig_ipv6_setup=0 Sun Jun 25 20:37:15 2017 /sbin/ip link set dev tun1 up mtu 1500 Sun Jun 25 20:37:15 2017 /sbin/ip addr add dev tun1 10.4.4.110/16 broadcast 10.4.255.255 Sun Jun 25 20:37:20 2017 /sbin/ip route add 88.150.240.7/32 via 94.23.43.254 RTNETLINK answers: Network is unreachable Sun Jun 25 20:37:20 2017 ERROR: Linux route add command failed: external program exited with error status: 2 Sun Jun 25 20:37:20 2017 /sbin/ip route add 0.0.0.0/1 via 10.4.0.1 Sun Jun 25 20:37:20 2017 /sbin/ip route add 128.0.0.0/1 via 10.4.0.1 Here I lose my connection with the machine via SSH. The only error what I see is something with the routing. If I log in to the machine with a kvm extender I can run commands. If I try to run the command "route" it is extremely slow. I toke 20-30s to show anything after the headlines. (see the attached picture, please)Ping outside doesn't work but the interface addresses are pingable. When I check here how many client connected - this connection is not on the list. (not even for a second) I tried to connect using this method from my Ubuntu laptop and I could connect without problem. I tried to sniffing around in the /etc/openvpn folder but I found nothing what can help at the first look. I believe that something around the routing cause the problem but I am afraid I am not experienced enough to spot the problem. See the attached pictures for the interface information. I am really appreciate any help Quote Share this post Link to post
V4bgbEeq 0 Posted ... With airvpn --cli I have similar problems.. it stops at "Checking route" and try again... and again Quote Share this post Link to post
zhang888 1066 Posted ... OVH requires a special 1:1 NAT setup on their failover IPs, so if your gateway is 94.23 and your failover is 51.254 you need to run: iptables -t nat -A POSTROUTING -s 10.4.0.0/16 -j SNAT --to-source [FAILOVER IP] Quote Hide zhang888's signature Hide all signatures Occasional moderator, sometimes BOFH. Opinions are my own, except when my wife disagrees. Share this post Link to post
V4bgbEeq 0 Posted ... Thank you for the help but I'm afraid I still miss something. You are mentioned my gateway in your comment - do I need to do something with it with iptables? My command was: iptables -t nat -A POSTROUTING -s 10.4.0.0/16 -j SNAT --to-source 51.254.xxx.yyy I tried run this iptables command before and after the vpn connection attend but booth times I had the same result. When I run this script with my ip address on the end (what I use to connect via ssh) I have no any error msg. Where should I collect useful logs / outputs about my problem? Quote Share this post Link to post
NaDre 157 Posted ... You may have some additional problem, but you should be aware that in order to start OpenVPN on a VPS, and not lose your SSH connection, you need to make some configuration changes so that you can maintain the SSH connection on the real interface of the VPS, once the VPN becomes the default gateway. See this: https://airvpn.org/topic/12274-ubuntu-vm-cant-connect-through-openvpn/?p=44812 1 cm0s reacted to this Quote Share this post Link to post
V4bgbEeq 0 Posted ... Thanks for the good start.I think this cause the problem but I have no idea why. /sbin/ip route add 88.150.240.7/32 via 94.23.43.254RTNETLINK answers: Network is unreachableI think I need to find out how can I fix this route problem... on my Ubuntu laptop it just goes fine.If any idea, please let me know Quote Share this post Link to post
V4bgbEeq 0 Posted ... after boot: user@ubuntu:~$ route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 94.23.43.254 0.0.0.0 UG 0 0 0 ens18 51.254.79.0 0.0.0.0 255.255.255.0 U 0 0 0 ens18 Other tests (ip route, ping) user@ubuntu:~$ ip route default via 94.23.43.254 dev ens18 onlink 51.254.79.0/24 dev ens18 proto kernel scope link src 51.254.79.xxx ser@ubuntu:~$ ping 94.23.43.254 PING 94.23.43.254 (94.23.43.254) 56(84) bytes of data. 64 bytes from 94.23.43.254: icmp_seq=1 ttl=255 time=75.6 ms 64 bytes from 94.23.43.254: icmp_seq=2 ttl=255 time=0.502 ms 64 bytes from 94.23.43.254: icmp_seq=3 ttl=255 time=0.513 ms ^C --- 94.23.43.254 ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2000ms rtt min/avg/max/mdev = 0.502/25.539/75.604/35.401 ms ser@ubuntu:~$ ping 88.150.240.7 PING 88.150.240.7 (88.150.240.7) 56(84) bytes of data. 64 bytes from 88.150.240.7: icmp_seq=1 ttl=55 time=4.85 ms 64 bytes from 88.150.240.7: icmp_seq=2 ttl=55 time=4.93 ms 64 bytes from 88.150.240.7: icmp_seq=3 ttl=55 time=4.89 ms ^C --- 88.150.240.7 ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2002ms rtt min/avg/max/mdev = 4.852/4.896/4.939/0.088 ms And it just doesn't work: user@ubuntu:~$ sudo /sbin/ip route add 88.150.240.7/32 via 94.23.43.254 RTNETLINK answers: Network is unreachable What do I miss? It looks like my default gw is pingable and the AirVPN server also avaiable... Quote Share this post Link to post
V4bgbEeq 0 Posted ... On another Ubuntu machine (laptop, not VPS) I did the same and went without error. On an other VPS from the same provider I had the same problem with the route add cmd Quote Share this post Link to post
V4bgbEeq 0 Posted ... I have a strange feeling about this VPS setup.My IP and the default GW IP are coming from two totally different subnets (IP 51.254.xxx.yyy and GW 94.23.43.254). Can it cause the trouble? Quote Share this post Link to post
NaDre 157 Posted ... I have a strange feeling about this VPS setup.My IP and the default GW IP are coming from two totally different subnets (IP 51.254.xxx.yyy and GW 94.23.43.254). Can it cause the trouble? Try adding "dev ens18" to the "ip" command then. Perhaps it cannot guess what device to use because of your config. Quote Share this post Link to post
V4bgbEeq 0 Posted ... Try adding "dev ens18" to the "ip" command then. Perhaps it cannot guess what device to use because of your config. user@ubuntu:~$ ifconfig ens18 Link encap:Ethernet HWaddr 00:50:56:06:06:9a inet addr:51.254.79.xxx Bcast:51.254.79.255 Mask:255.255.255.0 inet6 addr: fe80::250:56ff:xxxx:xxx/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:143723 errors:0 dropped:254 overruns:0 frame:0 TX packets:33591 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:15126899 (15.1 MB) TX bytes:2459052 (2.4 MB) 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:65536 Metric:1 RX packets:165 errors:0 dropped:0 overruns:0 frame:0 TX packets:165 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1 RX bytes:12225 (12.2 KB) TX bytes:12225 (12.2 KB) user@ubuntu:~$ route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 94.23.43.254 0.0.0.0 UG 0 0 0 ens18 51.254.79.0 0.0.0.0 255.255.255.0 U 0 0 0 ens18 user@ubuntu:~$ sudo /sbin/ip route add 88.150.240.7 via 94.23.43.254 dev ens18 RTNETLINK answers: Network is unreachable Thank you for your idea but still no success. I think the different subnet cause the trouble but I couldn't find any workaround yet. I saw a post where somebody complained about a VPS provider that how unacceptable this addressing policy and sombody refered a FreeBSD forum but the forum is down so I can not check it. I keep digging Quote Share this post Link to post
V4bgbEeq 0 Posted ... I found a solution to my routing problem - it may help to others:https://www.adminsehow.com/2011/09/gateway-on-a-different-subnet-on-linux/ So here are the assumptions : a.b.c.d is the host IPe.f.g.h is the gateway IPa.b.c.d & e.f.g.h are on different subnets. by default if you try to set gateway by following command : route add default gw e.f.g.h you will get this error : SIOCADDRT: No such process the trick is simple , first add a route to default gateway itself and then set the default gateway , like this : route add e.f.g.h/32 dev eth0 route add default gw e.f.g.h remember you may need to change eth0 to your device name , it may be eth1 or wlan0 or anything. In my case: user@ubuntu:~$ route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 94.23.43.254 0.0.0.0 UG 0 0 0 ens18 user@ubuntu:~$ sudo route add 94.23.43.254/32 dev ens18 user@ubuntu:~$ route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 94.23.43.254 0.0.0.0 UG 0 0 0 ens18 94.23.43.254 0.0.0.0 255.255.255.255 UH 0 0 0 ens18 user@ubuntu:~$ ping 8.8.8.8 PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data. 64 bytes from 8.8.8.8: icmp_seq=1 ttl=58 time=4.25 ms 64 bytes from 8.8.8.8: icmp_seq=2 ttl=58 time=4.67 ms 64 bytes from 8.8.8.8: icmp_seq=3 ttl=58 time=4.29 ms ^C --- 8.8.8.8 ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2002ms rtt min/avg/max/mdev = 4.254/4.410/4.678/0.197 ms So the trick was: route add 94.23.43.254/32 dev ens18 where I could told the system how can we get to our lovely gwAfter this extra route cmd I am able to connect to the VPN server and the scripts can adjust the route table. Quote Share this post Link to post
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