Lion OS X tinc issues.

Mike Bentzen mike at bentzen.com.au
Wed Apr 11 22:57:53 CEST 2012


Hi Matthew,

Hmmm… I would like to see more of the logs.

Before you try to enable dhcp, are you able to set a static ip address on the adapter?
Can you ping your ubuntu machine from your laptop before enabling dhcp?

Reading that Input/Output error, I believe the tuntaposx drivers are not loaded or not configured.
Did you run: sudo port load tuntaposx  after you installed the tuntaposx drivers?
Given your machine a reboot? :)

Mike



On 12/04/2012, at 2:05 AM, Matthew Tolle wrote:

> 
> Tuntaposx is installed:
> 
> # port installed
> The following ports are currently installed:
>   lzo2 @2.05_1 (active)
>   openssl @1.0.1_2 (active)
>   openvpn2 @2.2.1_0 (active)
>   tinc @1.0.18_0 (active)
>   tuntaposx @20111101_0 (active)
>   zlib @1.2.6_0 (active)
> 
> The commands you have below are more or less what I've been doing. My scroll back doesn't go far enough back for me to cut and paste the output. I can run it again when I get home tonight and send you more details if it helps. The basics are:
> 
> In one screen session I run:  tincd  --logfile=/var/log/tinc --debug=2 -n 
> In a second screen session I've got tail -f /var/log/tinc going. 
> 
> Tunnel comes up. On the ubuntu side your see this;
> 
> 2012-04-10 22:00:29 tinc.vpn[9267]: Trying to connect to laptop (185.193.32.20 port 655)
> 2012-04-10 22:00:29 tinc.vpn[9267]: Connected to laptop (185.193.30.32 port 655)
> 2012-04-10 22:00:29 tinc.vpn[9267]: Connection with laptop (185.193.30.32 port 655) activated
> 
> On the laptop side it looks connected as well:
> 
> 2012-04-10 22:00:56 tinc.vpn[57014]: tincd 1.0.18 (Apr  9 2012 13:14:47) starting, debug level 2
> 2012-04-10 22:00:56 tinc.vpn[57014]: /dev/tun0 is a Generic BSD tap device
> 2012-04-10 22:00:56 tinc.vpn[57014]: Executing script tinc-up
> 2012-04-10 22:00:56 tinc.vpn[57014]: Listening on 0.0.0.0 port 655
> 2012-04-10 22:00:56 tinc.vpn[57014]: Listening on :: port 655
> 2012-04-10 22:00:56 tinc.vpn[57014]: Ready
> 2012-04-10 22:01:33 tinc.vpn[57014]: Connection from 65.13.183.22 port 10503
> 2012-04-10 22:01:33 tinc.vpn[57014]: Connection with server (64.13.183.22 port 10503) activated
> 
> I run the ipconfig set tun0 DHCP. That's when I get the errors. 
> 
> I've tried waiting for a few minutes after the tunnels is up to see if things need to settle down before I run the DHCP command. Doesn't make a difference. 
> 
> Thanks,
> 
> -Matt
> 
> 
> On Apr 11, 2012, at 4:33 AM, Mike Bentzen wrote:
> 
>> Hi Matthew,
>> 
>> The subnet variable is not needed in switch mode. You can remove this line from your laptop's hosts file.
>> 
>> "Error while writing to Generic BSD tap device /dev/tun0: Input/output error"
>> This means that tinc cannot write to the network interface. It usually means that the interfaces don't exist (i.e. tuntaposx isn't installed) or it isn't configured.
>> 
>> If you have installed tuntaposx try this:
>> 
>> Open a terminal, and run tinc in debug mode:
>> :#  tinc -n <vpn> -d5 -D
>> When tinc is running, try to bring up the tap0 adapter. Open another terminal and run the command:
>> :#  ipconfig set tap0 dhcp
>> 
>> Hopefully, you should not see the Input/Output error anymore.
>> 
>> Kind Regards,
>> Mike
>> 
>> 
>> On 11/04/2012 3:10 PM, Matthew Tolle wrote:
>>> 
>>> 
>>> 
>>> Hi Folks,
>>> 
>>> This has been driving me nuts all day. I've been unable to google myself out of it. Maybe someone here can help?
>>> 
>>> I followed the instructions from: 
>>> 
>>> http://www.tinc-vpn.org/examples/macbook-install/
>>> 
>>> Ubuntu server <-> Ubuntu server works just fine with the same config. Ubuntu server <-> Mac laptop not so much. 
>>> 
>>> The error I'm getting is:
>>> 
>>> 2012-04-10 21:48:44 tinc.l3vpn[52621]: Error while writing to Generic BSD tap device /dev/tun0: Input/output error
>>> 2012-04-10 21:48:44 tinc.l3vpn[52621]: Error while writing to Generic BSD tap device /dev/tun0: Input/output error
>>> <lot of the same spew…>
>>> 
>>> The error pops up after I try to get DHCP going over the link. (ipconfig set tun0 DHCP). Not that it works before I try and do that. 
>>> 
>>> Both sides seems happily connected before issuing the DHCP command.
>>> 
>>> I've tried just about everything I can think of for the configs. Switch on, off, bridging on and off on the server side.. nothing seems to work. I do find it odd that under linux the virtual device looks like this: 
>>> 
>>> vpn       Link encap:Ethernet  HWaddr 4e:31:65:e7:32:f6  
>>>           inet6 addr: fe80::4c32:66ff:fec6:32e7/64 Scope:Link
>>>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>>>           RX packets:1034 errors:0 dropped:0 overruns:0 frame:0
>>>           TX packets:529919 errors:0 dropped:0 overruns:0 carrier:0
>>>           collisions:0 txqueuelen:500 
>>>           RX bytes:87139 (87.1 KB)  TX bytes:56253688 (56.2 MB)
>>> 
>>> standard kinds of goodness. On the Mac side it seems slim on info:
>>> 
>>> tun0: flags=8851<UP,POINTOPOINT,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>>>         open (pid 57014)
>>> 
>>> Makes me think that the tun/tap device is wonky? 
>>> 
>>> The Tun/Tap stuff I got from port as per the instructions. 
>>> 
>>> Configs: 
>>> 
>>> # cat tinc.conf 
>>> Name = laptop
>>> Mode = switch
>>> 
>>> # cat hosts/laptop 
>>> Subnet = 10.20.20.0/24
>>> Address = 10.20.20.38
>>> 
>>> -----BEGIN RSA PUBLIC KEY-----
>>> <blahblahblah>
>>> 
>>> # cat hosts/server
>>> 
>>> -----BEGIN RSA PUBLIC KEY-----
>>> <blahblahblah>
>>>  
>>> I figure it's something very simple that I'm missing. Can someone save my sanity please? 
>>> 
>>> Thanks,
>>> 
>>> -Matt
>>> 
>>> 
>>> 
>>> _______________________________________________
>>> tinc mailing list
>>> tinc at tinc-vpn.org
>>> http://www.tinc-vpn.org/cgi-bin/mailman/listinfo/tinc
>> 
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