Re: [OpenWrt-Devel] proto 'none' overwriting tun interfaces

[Roman Yeryomin]

On 13 October 2015 at 03:16,   wrote:
> Hi all,
>
> I've been compiling OpenWRT builds for my home router (Netgear WNDR3800 and 
> now a WD MyNet N750) for a number of years. I just recently encountered a 
> problem with the OpenVPN tun interfaces are showing up without IP addresses 
> after a reboot. I have the following in my /etc/config/network:
>
> config interface 'vpn_udp'
> option ifname 'tun0'
> option proto 'none'
>
> config interface 'vpn_tcp'
> option ifname 'tun1'
> option proto 'none'
>

Why do you use proto=none?
Isn't it supposed to be used to actually disable/deconfigure that interface?

Regards,
Roman
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Re: [OpenWrt-Devel] proto 'none' overwriting tun interfaces

[Adam Gensler]

> On Oct 13, 2015, at 4:50 AM, Roman Yeryomin  wrote:
> 
> On 13 October 2015 at 03:16,   wrote:
>> Hi all,
>> 
>> I've been compiling OpenWRT builds for my home router (Netgear WNDR3800 and 
>> now a WD MyNet N750) for a number of years. I just recently encountered a 
>> problem with the OpenVPN tun interfaces are showing up without IP addresses 
>> after a reboot. I have the following in my /etc/config/network:
>> 
>> config interface 'vpn_udp'
>>option ifname 'tun0'
>>option proto 'none'
>> 
>> config interface 'vpn_tcp'
>>option ifname 'tun1'
>>option proto 'none'
>> 
> 
> Why do you use proto=none?
> Isn't it supposed to be used to actually disable/deconfigure that interface?


I use proto=none because I don't want OpenWRT doing anything to the tun 
interfaces, which had been working for several years.

There's a separate "enabled" option that can be used to toggle interfaces 
on/off.


> 
> Regards,
> Roman
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Re: [OpenWrt-Devel] proto 'none' overwriting tun interfaces

[Alexander Couzens]

hi Adam,

I can confirm this bug.
You may open a ticket on dev.openwrt.org

best,
lynxis


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[OpenWrt-Devel] proto 'none' overwriting tun interfaces

[openwrt]

Hi all,

I've been compiling OpenWRT builds for my home router (Netgear WNDR3800 and now 
a WD MyNet N750) for a number of years. I just recently encountered a problem 
with the OpenVPN tun interfaces are showing up without IP addresses after a 
reboot. I have the following in my /etc/config/network:

config interface 'vpn_udp'
option ifname 'tun0'
option proto 'none'

config interface 'vpn_tcp'
option ifname 'tun1'
option proto 'none'

Then, my /etc/openvpn/udp.ovpn and /etc/openvpn/tcp.ovpn reference "dev tun0" 
and "dev tun1", respectively. I do it this way so I can link "vpn_udp" and 
"vpn_tcp" into /etc/config/firewall, and other places, like I would any other 
network interface. What I expect is that the tun0 and tun1 interfaces look like 
this after a reboot:

tun0  Link encap:UNSPEC  HWaddr 
00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
  inet addr:10.28.10.1  P-t-P:10.28.10.1  Mask:255.255.255.0
  UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
  RX packets:0 errors:0 dropped:0 overruns:0 frame:0
  TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:100
  RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

tun1  Link encap:UNSPEC  HWaddr 
00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
  inet addr:10.28.11.1  P-t-P:10.28.11.1  Mask:255.255.255.0
  UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
  RX packets:253526 errors:0 dropped:0 overruns:0 frame:0
  TX packets:356519 errors:0 dropped:834 overruns:0 carrier:0
  collisions:0 txqueuelen:100
  RX bytes:16948392 (16.1 MiB)  TX bytes:451900041 (430.9 MiB)

However the interfaces look like this instead:

tun0  Link encap:UNSPEC  HWaddr 
00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
  UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
  RX packets:0 errors:0 dropped:0 overruns:0 frame:0
  TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:100
  RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

tun1  Link encap:UNSPEC  HWaddr 
00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
  UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
  RX packets:0 errors:0 dropped:0 overruns:0 frame:0
  TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:100
  RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

Note, the IP addresses are missing. Hence, even though the openvpn processes 
are running, traffic won't flow because the tun interfaces have had their IP 
addresses wiped. I have to manually run "/etc/init.d/openvpn restart" to get 
everything back to normal after reboot.

Am I missing something? This is happening on freshly compiled images from both 
the latest trunk and latest 15.05.

Any thoughts and/or suggestions would be most appreciated.

Thanks,
Adam
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