NetworkManager is supposed to handle adding a specific host route for a
MessageProxy present in a combined APN.  This doesn't appear to be
happening anymore in vivid.

I checked krillin/rtm #22/sim1=ATT sim2=empty.

With WiFi off, the routing table looks like this:

default via 10.186.165.219 dev ccmni0  proto static
66.209.11.32 dev ccmni0  proto static  scope link

Note, the MessageProxy from the active APN is 'wireless.cingular.com',
which is publicly resolvable to...66.209.11.32.

With WiFi on, the routing table looks like this:

default via 192.168.1.1 dev wlan0  proto static
66.209.11.32 dev ccmni0  proto static  scope link
192.168.1.0/24 dev wlan0  proto kernel  scope link  src 192.168.1.8  metric 9

So, when the download manager connects through the proxy, it's data
flows over the mobile data interface ( ccmni0 ).

When I flash vivid-devel, on the same device, with the same SIM
configuration.  When WiFi is off, the routing table looks like this:

default via 10.177.125.140 dev ccmni0  proto static  metric 1024

When WiFi is enabled, it looks like this:

default via 192.168.1.1 dev wlan0  proto static  metric 1024 
192.168.1.0/24 dev wlan0  proto kernel  scope link  src 192.168.1.8 

...which means all traffic goes over the WiFi interface.

I've produced similar results on mako/rtm #19/ATT SIM.  I haven't yet
retried mako/vivid, but I suspect the same problem as with krillin.

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https://bugs.launchpad.net/bugs/1454625

Title:
  Cannot send MMS messages with combined contexts with WiFi connected

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