tinc never using UDP for data
Marwan Gedeon
marwan at gedeon.org
Sun Sep 15 10:43:29 CEST 2013
Ok here's the setup.
3 tinc hosts using network named 'publicip':
1- publicipinternet (ip: 71.19.246.40)
2- cancer connected to publicipinternet (visible public ip: 193.227.191.90)
3- publicipclient connected to publicipinternet (visible public ip:
178.135.234.225)
I'm having 'cancer' transfer SCP a file to 'publicipclient' through
'publicipinternet'
Here's log from 'cancer'
[root at cancer ~]# tincd -d4 -n publicip
[root at cancer ~]# tail -f /var/log/messages
Sep 15 11:22:29 cancer tinc.publicip[27225]: tincd 1.0.12 (Mar 15 2010
21:05:24) starting, debug level 4
Sep 15 11:22:29 cancer tinc.publicip[27225]: /dev/net/tun is a Linux
tun/tap device (tap mode)
Sep 15 11:22:29 cancer tinc.publicip[27225]: Executing script tinc-up
Sep 15 11:22:29 cancer NetworkManager[1122]: <warn>
/sys/devices/virtual/net/publicip: couldn't determine device driver;
ignoring...
Sep 15 11:22:29 cancer tinc.publicip[27225]: Listening on 0.0.0.0 port 655
Sep 15 11:22:29 cancer tinc.publicip[27225]: Ready
Sep 15 11:22:29 cancer tinc.publicip[27225]: Trying to connect to
publicipinternet (71.19.246.40 port 655)
Sep 15 11:22:30 cancer tinc.publicip[27225]: Connected to
publicipinternet (71.19.246.40 port 655)
Sep 15 11:22:30 cancer tinc.publicip[27225]: Connection with
publicipinternet (71.19.246.40 port 655) activated
Sep 15 11:22:31 cancer tinc.publicip[27225]: Got ADD_SUBNET from
publicipinternet (71.19.246.40 port 655) for ourself
Here's log from 'publicipclient'
Sep 14 18:45:52 localhost kernel: libfcoe_device_notification:
NETDEV_UNREGISTER publicip
Sep 14 18:46:01 localhost tinc.publicip[2063]: tincd 1.0.22 (Sep 9 2013
17:28:23) starting, debug level 4
Sep 14 18:46:01 localhost tinc.publicip[2063]: /dev/net/tun is a Linux
tun/tap device (tap mode)
Sep 14 18:46:01 localhost tinc.publicip[2063]: Executing script tinc-up
Sep 14 18:46:01 localhost avahi-daemon[1455]: Joining mDNS multicast
group on interface publicip.IPv4 with address 192.168.98.2.
Sep 14 18:46:01 localhost avahi-daemon[1455]: New relevant interface
publicip.IPv4 for mDNS.
Sep 14 18:46:01 localhost avahi-daemon[1455]: Registering new address
record for 192.168.98.2 on publicip.IPv4.
Sep 14 18:46:01 localhost tinc.publicip[2063]: Listening on 0.0.0.0 port 655
Sep 14 18:46:01 localhost tinc.publicip[2063]: Listening on :: port 655
Sep 14 18:46:01 localhost tinc.publicip[2063]: Ready
Sep 14 18:46:01 localhost NetworkManager[1443]: <warn>
/sys/devices/virtual/net/publicip: couldn't determine device driver;
ignoring...
Sep 14 18:46:01 localhost tinc.publicip[2063]: Trying to connect to
publicipinternet (71.19.246.40 port 655)
Sep 14 18:46:02 localhost tinc.publicip[2063]: Connected to
publicipinternet (71.19.246.40 port 655)
Sep 14 18:46:02 localhost avahi-daemon[1455]: Registering new address
record for fe80::54a0:2aff:fe52:53a4 on publicip.*.
Sep 14 18:46:02 localhost tinc.publicip[2063]: Connection with
publicipinternet (71.19.246.40 port 655) activated
Sep 14 18:46:03 localhost tinc.publicip[2063]: Got ADD_SUBNET from
publicipinternet (71.19.246.40 port 655) for ourself
Sep 14 19:03:12 localhost tinc.publicip[2063]: publicipinternet
(71.19.246.40 port 655) didn't respond to PING in 5 seconds
Sep 14 19:03:12 localhost tinc.publicip[2063]: Closing connection with
publicipinternet (71.19.246.40 port 655)
Sep 14 19:03:12 localhost tinc.publicip[2063]: Could not set up a meta
connection to publicipinternet
Sep 14 19:03:12 localhost tinc.publicip[2063]: Trying to re-establish
outgoing connection in 5 seconds
Sep 14 19:03:17 localhost tinc.publicip[2063]: Trying to connect to
publicipinternet (71.19.246.40 port 655)
Sep 14 19:03:18 localhost tinc.publicip[2063]: Connected to
publicipinternet (71.19.246.40 port 655)
Sep 14 19:03:18 localhost tinc.publicip[2063]: Connection with
publicipinternet (71.19.246.40 port 655) activated
here's jnettop log on the eth1 interface from 'publicipinternet' showing
TCP 655 primarily used for traffic based on the transfer speed (2 TCP
connections at speeds of 137KB/s and 111KB/s for TCP whereas 1 UDP
connect at 5.45KB/s
publicip.info <-> 193.227.191.90
7.63k/s 137k/s
145k/s
71.19.246.40 655 TCP
193.227.191.90 51410 667k
8.42m 9.08m
publicip.info <-> 178.135.234.225
109k/s 2.39k/s
111k/s
71.19.246.40 655 TCP
178.135.234.225 10379 7.81m
246k 8.05m
publicip.info <-> 178.135.234.225
882b/s 5.45k/s
6.31k/s
71.19.246.40 655 UDP
178.135.234.225 64291 20.1k
496k 516k
-------- Original Message --------
Subject: Re: tinc never using UDP for data
From: Nikolaus Rath <Nikolaus at rath.org>
To: tinc at tinc-vpn.org
Date: 9/14/2013 2:10 AM
> Marwan Gedeon<marwan-cpYkUDY9fzsdnm+yROfE0A at public.gmane.org> writes:
>> Hello list,
>> I looked around online but didn't find an answer, so if you can help
>> me out, I'll appreciate
>> I'm trying to create a tinc network which transmits data as UDP and
>> not TCP, because I will pass VoIP traffic on top of it, which would
>> not work fine if using TCP.
>> I have configured tinc between 2 machines and it's working fine,
>> default ports open (UDP 655 and TCP 655) and I have tested with netcat
>> that I can transmit data over UDP between the 2 hosts
>> However, whenever I bring up tinc network,and try to transmit files
>> over it, they are going over TCP.
>> I have read that tinc will try to use UDP for data and automatically
>> fall back to TCP, but I can't understand in my case why UDP is not
>> being used for data.
>> I appreciate some help to understand why UDP is not used so I fix the
>> problem causing this and make it used for data transmission.
>
> I'd recommend to run tinc with -d4 to get some more information and (if
> that doesn't help already) include the output in your question.
>
> Best,
> -Nikolaus
>
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