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so I am planning to make a network analyzer using Perl. But before I start I have to answer this question, can a Perl program actually sniff packets in multiple NICs simultaneously? a feature of the program im going to make is that it needs to sniff the packets in the whole LAN within a switch. Is this possible in Perl?
Sniffing packets in the whole lan is not possible. It is only possible if your switch supports it. Many swith has an option to copy all traffic to one of its port for monitoring/sniffing.
http://en.wikipedia.org/wiki/Port_mirroring
http://www.miarec.com/knowledge/switches-port-mirroring
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For an ethernet connection between 2 points which will be used as point to point communication (for embedded devices). Is internet connection, hubs or switches are really necessary? Or can we still send and receive data from one MCU to another one by using ethernet without using any internet connection, hubs or switches?
There's certainly no need for an Internet connection.
If you want to connect two computers together directly, then you will need to use a crossover cable rather than a patch cable unless the devices you are using support auto MDI-X.
Putting a cheap hub between them will probably be simpler.
No, they are not necessary. We ofen do this between either two of "product board", "FPGA board", and "PC" when debugging ethernet Tx/Rx issues.
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I need to intercept the communication between a client computer and the server computer, this communication is done via TCP sockets and i have to store that data in a server.
A TCP proxy can be a right solution or what should i do?
Thanks and sorry for my poor English
A tcp proxy can do the job. Also you could use wireshark on the client or server computer to capture the traffic.
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I'm testing a Media Server and I need to make multiple SIP calls on the same time. I used microSIP but I failed to find how to launch it with multiple instances. Is any way to launch several instances of microSIP on the same Windows7?
Do you know any other sip client with multiple instances? Linphone doesn't works on my Windows7.
Just copy MicroSIP folder to different folders locations and launch separately
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When I do socket programming, I found at least one computer has to have a public IP to make the connection (or reverse connection). I'm wondering if it is possible for 2 computers that are behind different routers to connect to each other (and they don't have port forwarding and don't use proxy)? If that's not possible, how bit torrent works for computers that are behind routers? Does it mean the computers that are behind different routers cannot share among each other?
Bittorent clients are using a protocol named uPNP, that tells router to redirect specified port in bittorrent client to computer that runs client.
Here is more information about protocol.
https://en.wikipedia.org/wiki/Universal_Plug_and_Play
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I know that routers are used to send data between distinct networks, but am wondering if they recognize what type of data (i.e., image, emails) they are transmitting.
No, generally routers know service type instead of data type because of well-known ports. Routes focus on how to forward bytes between different networks, a problem like which path is better.
Let's take a look at tcp/ip protocol. Router is a device operates at the 3rd layer(internet). Only processes that work in application layer do care data type.