how to design a multi gateways about wireless network

[辛文飞]

My research involves with multi gateways, I have been troubled about this question for several months, I have tried to construct many simulation scenarios, but they all finished with fail. I always begin with a simple model, then extending it with complexity. then fail. Now, the newest simulation I have writen have been uploaded as attachments. apcsma.cc is a single gateway simulation, it runs successfully while the apcsmaext4.cc is a two gateways simulation which can't generate traffic normally, if there exists any error about any aspect, please correct for me!!! Thank you all!!!

I make a brief introduction about the simulation settings. For details, you can download the file.

apcsmaext4.cc   topology is as following:

I have set static routing for n1, n2, n4, n5, n8.      n1 and n4 use the same channel, n5 and n8 are the same as them but another channel.

// Establish communication between n2 and n7

//

//         Wifi 192.168.1.0

//        AP(ssid1)      AP(ssid1)

//        *    *    *    *

//        |     |    |     | 

//       n1   n2   n3   n4 

//       ||              ||   

//       ||              ||   

//       ||              ||   

//       ||1            ||1    

//       ||9            ||9                  

//       ||2            ||2 

//       ||.             ||.                   

//       ||1 c         ||1 c 

//       ||6 s         ||6 s

//       ||8 m        ||8 m

//       ||.  a         ||. a

//       ||2            ||2 

//       ||.             ||. 

//       ||0            ||0  

//       ||              ||              

//       ||              ||              

//       n5   n6   n7   n8

//        |    |    |    |

//        *    *    *    *

//        AP(ssid2)      AP(ssid2)

//        Wifi 192.168.3.0

//

//

apcsma.cc topology is as following:

//   Wifi 192.168.1.0

//                 AP

//  *     *      *     *

//  |      |      |     |           192.168.2.0

// n1   n2   n3   n4 ============== n5   n6   n7   n8

//                                    csma           |      |      |      |

//                                                       *     *      *     *

//                                                      AP

//                                                      Wifi 192.168.3.0

[辛文飞]

Is there someone can help me???

在 2017年6月8日星期四 UTC+8下午10:16:23，辛文飞写道：

[辛文飞]

Is there someone can help me???

在 2017年6月8日星期四 UTC+8下午10:16:23，辛文飞写道：

My research involves with multi gateways, I have been troubled about this question for several months, I have tried to construct many simulation scenarios, but they all finished with fail. I always begin with a simple model, then extending it with complexity. then fail. Now, the newest simulation I have writen have been uploaded as attachments. apcsma.cc is a single gateway simulation, it runs successfully while the apcsmaext4.cc is a two gateways simulation which can't generate traffic normally, if there exists any error about any aspect, please correct for me!!! Thank you all!!!

[Tommaso Pecorella]

Hi,

sorry if it took so long - too much work and too few time.

Your two gateways simulation has a structural issue - i.e., it won't work. Let's analyze why.

First and foremost, you have a CSMA network connecting n1, n4, n5, and n8. No matter how you draw it, the four nodes are connected, and they can all talk to each other.

That's a good thing  - otherwise you would have two network with the same prefix - even worse.

However, I don't know if it's the thing you wanted.

The two Wi-Fi networks have a more important issue: two APs (each) using the same prefix. This is really a bad idea, as routing will go nuts.

Just think about it. How is it possible to know that n2 (for example) is reachable through n1 and not n4 ?

You can't say from it's IP address, and the packets will be sent to one of the two APs - probably the wrong one.

Unless you have a coordinated AP deployment - i.e., one with a common controller handling the AP/associated STA binding - this configuration is impossible.

Note that it's not feasible in ns-3 AND in real life.

I hope this can help,

T.

[辛文飞]

Thank you for your reply for this question which has been discarded for days. My network topology designment has some problems in feasibility. I want to realize the function that building connection between n2 and n7, even I assigned the different prefix to the four nodes, they still won't work, the key of the question is that one station only can associate with one ap.

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