Hi,

I my case, I use two interfaces  eth0 (to local network access) and wlan0 
(to get internet),   the eth0 blocks wlan0, and I don't get internet, when 
Unplugged the cable, I get internet again.  How I set Priority in the 
interfaces?? the most important for me is  wlan0  to have internet,  the 
second one  eth0.

I tried with IFMETRIC, but my BBB omit everything. 
When I reboot, use a few seconds the wlan0, but a moment after, eth0 blocks 
again.

with route -n ,  I see the routing,  Despite of set metric 0 or 1 to the 
wlan0,  and metric 5, 10 or higher,  the eth0 appers with  a metric 0  ???

This procedures work fine with the Rasberry pi.

any ideas, or help in this topic.



On Sunday, July 20, 2014 at 5:43:49 AM UTC-5, nebius wrote:
>
> Hi,
> here Nevio, from Italy. I'm new in the forum.
> I'm playing with a BeagleBone Black C with debian 7.5 2014-07-06 version.
> The BBB is connected to the local network with internet access, and I run 
> it with ssh.
> I have connected also a usb internet-key (Huawei E3131) that work out of 
> the box. This internet key is different from the others because it is seen 
> as an ethernet device, not usb device.
> I am having trouble with configuring which internet connection the system 
> has to use.
> In particular I would like the BBB use the internet connection via LAN if 
> the internet via LAN is up, else the other connection (via usb internet 
> key).
> I have configured the two eth connections with different priorities 
> (/etc/network/interfaces), however if the LAN has no internet connection 
> the system don't use the usb-key.
> I post my config file.
>
> eth0 = wired connection, gateway 192.168.0.1
> eth1 = via usb internet key, gateway 192.168.1.1
>
> debian@arm:~$ ping 8.8.8.8
> PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
> From 192.168.0.1 icmp_seq=1 Destination Net Unreachable
> From 192.168.0.1 icmp_seq=2 Destination Net Unreachable
> From 192.168.0.1 icmp_seq=3 Destination Net Unreachable
> From 192.168.0.1 icmp_seq=4 Destination Net Unreachable
> From 192.168.0.1 icmp_seq=5 Destination Net Unreachable
> ^C
> --- 8.8.8.8 ping statistics ---
> 9 packets transmitted, 0 received, +9 errors, 100% packet loss, time 
> 8012ms
>
>
> debian@arm:~$ ping -I eth1 8.8.8.8
> PING 8.8.8.8 (8.8.8.8) from 192.168.0.14 eth1: 56(84) bytes of data.
> 64 bytes from 8.8.8.8: icmp_req=3 ttl=43 time=658 ms
> 64 bytes from 8.8.8.8: icmp_req=2 ttl=43 time=1687 ms
> 64 bytes from 8.8.8.8: icmp_req=1 ttl=43 time=2687 ms
> 64 bytes from 8.8.8.8: icmp_req=4 ttl=43 time=47.6 ms
> ^C
> --- 8.8.8.8 ping statistics ---
> 8 packets transmitted, 7 received, 12% packet loss, time 7003ms
> rtt min/avg/max/mdev = 47.670/899.876/2687.464/921.850 ms, pipe 3
>
>
> debian@arm:~$ sudo route -n
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    Use 
> Iface
> 0.0.0.0         192.168.0.1     0.0.0.0         UG    0      0        0 
> eth0
> 0.0.0.0         192.168.1.1     0.0.0.0         UG    10     0        0 
> eth1
> 192.168.0.0     0.0.0.0         255.255.255.0   U     0      0        0 
> eth0
> 192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 
> eth1
> 192.168.7.0     0.0.0.0         255.255.255.252 U     0      0        0 
> usb0
>
>
> debian@arm:~$ nano /etc/network/interfaces
>
>
> # This file describes the network interfaces available on your system
> # and how to activate them. For more information, see interfaces(5).
>
>
> # The loopback network interface
> auto lo
> iface lo inet loopback
>
>
> # The primary network interface
> auto eth0
> iface eth0 inet static
> address 192.168.0.14
> netmask 255.255.255.0
> gateway 192.168.0.1
>
>
> # Example to keep MAC address between reboots
> #hwaddress ether DE:AD:BE:EF:CA:FE
>
>
> # The secondary network interface
> auto eth1
> allow-hotplug eth1
> #allow-auto eth1
> iface eth1 inet static
> address 192.168.1.100
> netmask 255.255.255.0
> gateway 192.168.1.1
> metric 10
>
>
> # WiFi Example
> #auto wlan0
> #iface wlan0 inet dhcp
> #    wpa-ssid "essid"
> #    wpa-psk  "password"
>
>
> # Ethernet/RNDIS gadget (g_ether)
> # ... or on host side, usbnet and random hwaddr
> # Note on some boards, usb0 is automaticly setup with an init script
> iface usb0 inet static
>     address 192.168.7.2
>     netmask 255.255.255.0
>     network 192.168.7.0
>     gateway 192.168.7.1
>
>
-- 

------------------------------
*Universidad del Cauca: Calidad académica con compromiso regional y 
nacional.*

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