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I have two networks:
1 x Wireless network
1 x USB dongle ( MobileBroadband)

The issue is that NetworkManager assigns the same network for both of
them so I can't do any kind of routing and basically one network is
unusable. Even worse sometimes  the network is not working at all
because I guess the packets get confused on which NIC they should go.
I can provide more debug information upon request.

 ip route show
default via 192.168.1.1 dev eth1  proto static 
192.168.1.0/24 dev wlan0  proto kernel  scope link  src 192.168.1.100 
192.168.1.0/24 dev eth1  proto kernel  scope link  src 192.168.1.100  metric 1 


 ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
    link/ether ec:a8:6b-MASKED brd ff:ff:ff:ff:ff:ff
4: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether f8:16:54:-MASKED brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.100/24 brd 192.168.1.255 scope global wlan0
       valid_lft forever preferred_lft forever
    inet6 fe80::fa16:54ff:fe96:c648/64 scope link 
       valid_lft forever preferred_lft forever
46: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN group default qlen 1000
    link/ether 58:2c:80:-MASKED brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.100/24 brd 192.168.1.255 scope global eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::5a2c:80ff:fe13:9263/64 scope link 
       valid_lft forever preferred_lft forever


Ubuntu 14.04.1 LTS

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: trusty
-- 
NetworkManager creates duplicate networks
https://bugs.launchpad.net/bugs/1471526
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