access point related

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access point has any table related to other access points information?

My question is that.Can wifi access point1 communicate with wifi access point2.How frame exchange or sends to each other?another question if i want to built a trust relation ship between 2 adjacent access points in same intra-subnet.how i will built?

another question for trust between two access point.Can both exchange identity with each other if yes then how?Because i read access points has public and private key,also certificate of public key like Cert(Kp). for identity purpose both access point can exchange public key certificate?will it create any security issue or not?another question is that.if i want to built a protocol like Cisco neighbor Discovery for wifi access point.Can it will suit able for wifi access point?can you give me answer of these question?

another question is that.you also know switches,routers has table.Like forwarding table to route the packets from source to destination.Is wifi access point has any table to route the frames or packets from source access point to another destination access point at wired back-end?you assume scenario access point 1 and access point 2 attached with same switch through coaxial cable .also assume every access point has embedded server.Is it possible?

have you any link or document related to that?

these questions are related to wireless local area network in a building.Infrastructure Mode.

also another question. is access piont1 and access point2 can share information related to mobile stations like laptops who want roaming between these access points?

Posted 9-Nov-12 4:30am

seemazaib

Updated 9-Nov-12 5:43am

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joshrduncan2012 9-Nov-12 10:34am

Not clear question.

OriginalGriff 9-Nov-12 10:37am

This is not a good question - we cannot work out from that little what you are trying to do.
Remember that we can't see your screen, access your HDD, or read your mind.
Use the "Improve question" widget to edit your question and provide better information.

seemazaib 9-Nov-12 10:41am

My question is that.Can wifi access point1 communicate with wifi access point2.How frame exchange or sends to each other?another question if i want to built a trust relation ship between 2 adjacent access points in same intra-subnet.how i will built?

seemazaib 9-Nov-12 10:53am

another question for trust between two access point.Can both exchange identity with each other if yes then how?Because i read access points has public and private key,also certificate of public key like Cert(Kp). for identity purpose both access point can exchange public key certificate?will it create any security issue or not?another question is that.if i want to built a protocol like Cisco neighbor Discovery for wifi access point.Can it will suit able for wifi access point?can you give me answer of these question?

seemazaib 9-Nov-12 11:00am

another question is that.you also know switches,routers has table.Like forwarding table to route the packets from source to destination.Is wifi access point has any table to route the frames or packets from source access point to another destination access point at wired back-end?you assume scenario access point 1 and access point 2 attached with same switch through coaxial cable .

seemazaib 9-Nov-12 11:03am

you are experts please help me .These are questions in my mind.Because there are so many questions in my mind

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Jason Gleim · Answer 1 · 2012-11-09T05:08:00

Solution 1

Your questions are very complex but I can offer some suggestions for further reading.

Your question about AP 1 talking directly to AP 2 can be interpreted in two ways. If you want them to ONLY talk to each other and be transparent to the traffic passed between them, that is called Bridge Mode and I believe it is part of the IEEE/ANSI 802 standards. You should start there to learn more.

If want to know about a group of APs talking to each other and passing traffic between all of them (again, in a manner transparent to the underlying network) then you would probably want to look up MESH networking. Again, there should be a lot in IEEE/ANSI. You might also look at the specifics of the Zigbee mesh protocol since it is implemented at the microprocessor level and is therefore much lower and might be easier to understand.

All these standards deal with the security and trust in different manners because of the different ways they are implemented. And remember, it will be different from the way it connects to the end clients as well (like laptops, tablets, phones, etc). The good news is that all of it is IEEE/ANSI standard (expect maybe the ZigBee stuff) and therefore all well documented. Lots of reading and you can be an expert.

Posted 9-Nov-12 5:08am

Jason Gleim

Comments

seemazaib 9-Nov-12 11:34am

have you any link or document related to that?

Jason Gleim 9-Nov-12 11:39am

https://www.google.com/webhp?q=ansi+802+standards

seemazaib 9-Nov-12 11:51am

my another question is that how i read implementation of protocol?is mathematical formulas existing for these protocol or not?i need simple and easy formulas which are understand able easily.

Jason Gleim 9-Nov-12 12:15pm

The protocols are not typically mathematical as they are really functional implementations. Remember that network communications rely on the 7-layer model to provide different levels of service. None of that is really mathematical in nature. The encryption, of course, is a different story. It is all mathematical.

But to answer your question, no... there is no easy path to understanding and becoming familiar with all of this. It takes a lot of time and a lot of understanding... and in many cases not just with software but also with hardware, electrical, and cryptography. It is all very complex in nature and while the specifications aren't written to promote understanding (as they have to be very precise) there are many people who have written on these subjects to try to make them more accessible and understanding. You will have to do the research yourself to find the areas you are interested in and to become an expert in those areas.

Jason Gleim 9-Nov-12 12:21pm

Let me add too that you might just want to start with the basics of how wireless network works before you try to get into the tough stuff. For example, do you know the differences between the different standards? (a/b/g/n) Do you know what the hidden node problem is? Do you know how a device associates with an AP to establish a connection? Do you know how congestion control is managed and what a back-off signal is? Do you know how roaming clients are handled in a network with a centralized controller versus one without? All of these are probably questions you should know and understand before you try to jump into complex topics like encrypted bridges and mesh networking. Again, there are lots and lots of resources out there you can find on Google and in books. There is no shortcut though...

seemazaib 9-Nov-12 12:36pm

i already read about access point internal design,a,b,g,n are wifi access point technology,i already read about access point and server communication,mobile station association with access point,also how handoff occur ,its process or 3 phases, inter access point protocol(IAPP),management,control and data frame ,authentication server soo on.etc i not find any material related to communication only between two wifi access point,or between multiple access points.Why some one publish a research work on that topic.how access point1 will find its adjacent neighbor.how access point2 keep identity of access point1 in its memory vise virsa.

Jason Gleim 9-Nov-12 12:45pm

It sounds to me like you are interested in mesh networking. That is a newer area and so information might be harder to find. Plus, there are a BUNCH of competing implementations, some open, some closed. I'm not sure you will be satisfied with what you find.

seemazaib 9-Nov-12 12:39pm

I am tired totally,my mind condition ..............,i cant explain.do you know any phd or Mphil person related to networking.any your friend or colleague?

seemazaib 9-Nov-12 12:53pm

basically i have study till link layer 2 of osi model.That is my scope.basically i choose wrong topic for thesis.now my advisor is not changing that topic.I am now trying to read literature review.But every work is different in research paper.Some time work is related with each other.Now i am stuck in my work.I have read so many research papers which is not related to my topic.Now i am confused.what i do.How i solve my methodology.Very big problem.

seemazaib 9-Nov-12 12:55pm

My advisor favorite subject is advance algorithm.She is also expecting an algorithm from me.

seemazaib 9-Nov-12 13:07pm

i want to make a trust relationship(authentication) between two access points and than perform a secure seamless handoff between them.so for that purpose my assumptions are
1.access point1 and access point2 both will be make a trust relationship with each other.For that purpose both will share their identity with each other and save in their memory.
2.too keep account of each other an protocol will required in both access point.Like Cisco neighbor discovery protocol.
3.handoff protocl will required to keep roaming mobile station list in access point1 and in access point2.like access point1 will send its mobile station information to access point2 and vise virsa
how i show diagrammatically in layerd frame work.my id is game.1233@hotmail.com.
now problem

Jason Gleim 9-Nov-12 14:05pm

Why don't you make each access point an identity provider then tackle it as a federated identity issue? So Client A would authenticate with AP 1. When client A roams to AP 2, it would present the authentication token from AP 1 (which includes the fact that it came from AP 1). AP 2 would look to see if it trusts AP 1 (which it would) and if so, it would check with AP 1 to see if Client A's token is still valid. By doing this, each access point only has to keep track of the clients it has authenticated and which access points it trusts. If a client presents a token from an AP that is trusted, and the token is still valid, then the new AP can accept the client as trusted because of the federated authentication.

In terms of scalability, this is the only way to do it. Trying to build and maintain tables of what clients are authenticated to what access points would become a maintenance nightmare. (Imagine a large building where there were over 1000 access points!) Not even considering how to add and remove trusted access points from every other access point. You would quickly end up in circles and the whole protocol would become too bulky. The federated security model is used by web sites all the time. Even CodeProjects accepts Google, LinkedIn, and Facebook as third-party authentication providers. You can apply the same concepts at the AP level and, I think, solve your problem.

Good luck!