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

[openwrt at a.gnslr.us]

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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