I have tried to set up a Banana Pi M1+ as a wireless router (installed Armbian_5.35_Bananapi_Ubuntu_xenial_next_4.13.16 ). Existing set up and testing environment are as following:

 

 

Now, my android phone can access the internet and the Banana Pi works as expected. However, when I checked the file /var/log/syslog of the x86 router, I found :

Jan 20 00:12:51 router86 kernel: [25688.378214] IPv4: martian source 104.17.115.27 from 10.111.103.154, on dev br0
Jan 20 00:12:51 router86 kernel: [25688.378253] ll header: 00000000: 00 e0 4c 68 12 86 02 d4 09 42 7c 37 08 00        ..Lh.....B|7..
Jan 20 00:12:51 router86 kernel: [25688.378422] IPv4: martian source 104.17.115.27 from 10.111.103.154, on dev br0
Jan 20 00:12:51 router86 kernel: [25688.378433] ll header: 00000000: 00 e0 4c 68 12 86 02 d4 09 42 7c 37 08 00        ..Lh.....B|7..
Jan 20 00:12:51 router86 kernel: [25688.379413] IPv4: martian source 104.17.115.27 from 10.111.103.154, on dev br0
Jan 20 00:12:51 router86 kernel: [25688.379426] ll header: 00000000: 00 e0 4c 68 12 86 02 d4 09 42 7c 37 08 00        ..Lh.....B|7..
Jan 20 00:12:51 router86 kernel: [25688.379573] IPv4: martian source 104.17.115.27 from 10.111.103.154, on dev br0
Jan 20 00:12:51 router86 kernel: [25688.379582] ll header: 00000000: 00 e0 4c 68 12 86 02 d4 09 42 7c 37 08 00        ..Lh.....B|7..
Jan 20 00:12:51 router86 kernel: [25688.380656] IPv4: martian source 104.17.115.27 from 10.111.103.154, on dev br0
Jan 20 00:12:51 router86 kernel: [25688.380668] ll header: 00000000: 00 e0 4c 68 12 86 02 d4 09 42 7c 37 08 00        ..Lh.....B|7..
Jan 20 00:12:51 router86 kernel: [25688.380817] IPv4: martian source 104.17.115.27 from 10.111.103.154, on dev br0
Jan 20 00:12:51 router86 kernel: [25688.380827] ll header: 00000000: 00 e0 4c 68 12 86 02 d4 09 42 7c 37 08 00        ..Lh.....B|7..
Jan 20 00:12:51 router86 kernel: [25688.382479] IPv4: martian source 104.17.115.27 from 10.111.103.154, on dev br0
Jan 20 00:12:51 router86 kernel: [25688.382489] ll header: 00000000: 00 e0 4c 68 12 86 02 d4 09 42 7c 37 08 00        ..Lh.....B|7..
Jan 20 00:12:51 router86 kernel: [25688.382693] IPv4: martian source 104.17.115.27 from 10.111.103.154, on dev br0
Jan 20 00:12:51 router86 kernel: [25688.382703] ll header: 00000000: 00 e0 4c 68 12 86 02 d4 09 42 7c 37 08 00        ..Lh.....B|7..
Jan 20 00:12:51 router86 kernel: [25688.382911] IPv4: martian source 104.17.115.27 from 10.111.103.154, on dev br0
Jan 20 00:12:51 router86 kernel: [25688.382920] ll header: 00000000: 00 e0 4c 68 12 86 02 d4 09 42 7c 37 08 00        ..Lh.....B|7..
Jan 20 00:12:51 router86 kernel: [25688.415770] IPv4: martian source 104.17.115.27 from 10.111.103.154, on dev br0
Jan 20 00:12:51 router86 kernel: [25688.415809] ll header: 00000000: 00 e0 4c 68 12 86 02 d4 09 42 7c 37 08 00        ..Lh.....B|7..

The internal IP of my phone (10.111.103.154) behind the Banana Pi  leaked to the external x86 router !

 

How can I fix this ? 

Thanks.

 

You have bridged two interfaces eth0 and wlan. By default armbian works as client/server where all interfaces are bridged. You need to setup eth0 and wlan on different subnets without bridging them together.

11 hours ago, kukulo said:

You have bridged two interfaces eth0 and wlan. By default armbian works as client/server where all interfaces are bridged. You need to setup eth0 and wlan on different subnets without bridging them together.

 

 

Thanks for your reply, but I have not bridged eth0 and wlan0 :

root@bananapi:~# brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.983b16c7cd8d       no              wlan0
root@bananapi:~#

I set up br0 because I have ordered an USB NIC (eth1) and I am going to add it to br0 later.