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Multiple Router Issue #2: cascaded routers

 
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pbft



Joined: 21 Jan 2016
Posts: 7
Location: Vermont

PostPosted: Thu Jan 21, 2016 2:06 pm    Post subject: Multiple Router Issue #2: cascaded routers Reply with quote

A second issue I've encountered is installations where our device is connected to a router which is in turn connected to another router. For example:

Our device (192.168.1.x)
|
V
Router 1 (192.168.1.1 internal)
Router 1 (10.0.0.x external)
|
V
Router 2 (10.0.0.1 internal)
Router 2 (wan address external)
|
V
Internet

In this scenario, is there any reasonable way to
1) Figure out the topology
2) Set up ports through both routers

Any help, suggestions, guidance, or sympathy greatly appreciated.
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miniupnp
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Joined: 14 Apr 2007
Posts: 1454

PostPosted: Thu Jan 21, 2016 3:48 pm    Post subject: Reply with quote

This setup is clearly out of IGD spec scope.

see http://miniupnp.tuxfamily.org/forum/viewtopic.php?t=16
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pbft



Joined: 21 Jan 2016
Posts: 7
Location: Vermont

PostPosted: Thu Jan 21, 2016 3:55 pm    Post subject: Reply with quote

miniupnp wrote:
This setup is clearly out of IGD spec scope.

see http://miniupnp.tuxfamily.org/forum/viewtopic.php?t=16


I expected that - thanks for the link. Have to chew on that for a while. I suppose if all the gateway devices have non-routable wan addresses, I could at least alert the user that they're likely behind a second router and suggest that they connect to the upstream router instead. Better than throwing up our hands and quitting.
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miniupnp
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PostPosted: Thu Jan 21, 2016 4:06 pm    Post subject: Reply with quote

You could also use the router which IP address is the default gateway...
https://github.com/miniupnp/libnatpmp/blob/master/getgateway.c
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