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OS Ubuntu 14.04.

Objective: wwan0 is my Broadband Connection - want to use to connect to intranet only (corporate network)

wlan0 is my WIFI connection - want to use to connect to internet only

I am using NM and able to connect to both networks simultaneously.

Problem:

  1. When I check "Use this connection only for resources on its network" for WIFI (wlan0), I can only access intranet.

output of route

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         10.103.6.66     0.0.0.0         UG    0      0        0 wwan0
10.0.0.0        *               255.255.255.0   U     9      0        0 wlan0
10.103.a.bc     *               255.255.255.192 U     13     0        0 wwan0
  1. When I check "Use this connection only for resources on its network" for Mobile Broadband (wwan0), I can only access internet.

output of route

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         10.0.0.2        0.0.0.0         UG    0      0        0 wlan0
10.0.0.0        *               255.255.255.0   U     9      0        0 wlan0
10.103.d.ef     *               255.255.255.192 U     13     0        0 wwan0

How/What do I configure so that I can achieve my objective? viz, use WIFI for internet and Mobile BB for intranet

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7
  • It is not clear what is your intranet. How do you connect there? Over internet too using broadband, or some more direct way. Are these corporate resources in some IP subnet?
    – Pilot6
    Aug 18, 2015 at 16:39
  • intranet refers to corporate resources. I connect using mobile broadband (wwan0). For connection out of the corporate network into internet I use WIFI wlan0.
    – hoosain.madhi
    Aug 18, 2015 at 16:51
  • You need to add more details. What is your intranet IP subnet? You can set up a route there through wwan0. But you need to know the mask.
    – Pilot6
    Aug 18, 2015 at 16:55
  • From NM Connection Info I get subnet mask for wwan0 is 255.255.255.248. ifconfig: wwan0 Link encap:Ethernet HWaddr 02:80:37:ec:02:00 inet addr:10.103.a.bcd Bcast:10.103.9.167 Mask:255.255.255.248
    – hoosain.madhi
    Aug 18, 2015 at 17:00
  • And each time you get a different gateway on wwan0? That is weird. Do you work for a broadband company?
    – Pilot6
    Aug 18, 2015 at 17:02

2 Answers 2

Reset to default
1

I have solved the problem and have met my objectives.

I am using the hint provided to me by Pilot6.

By using a script I am able to identify the default route that is assigned when connecting to wwan0 something like :

IP=$(nmcli dev list iface ttyACM1 | awk '/gw =/ { print $7 }')

I then use the default route to set routes for specific IP addresses on the intranet. 

route add -net 10.0.0.0 netmask 255.0.0.0 gw $IP

etc

All other traffic is then routed via wlan0.

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-1

Well theoretically, you can't connect to two networks simultaneously. But there are tools like Connectify dispatcher that let you combine two connections. Have a look here

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1
  • In fact, it's a solution and the page isn't an article or a forum link, it's a repository in github. and thanks for the edit, i appreciate that Fabby :D
    – Ahmed Abdelkafi
    Aug 19, 2015 at 15:24

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