network simulator

Question

I need to build a device emulator which can communicate over real IP address

I need to create as many instances I can for the device. With one IP and MAC address for each emulator instance

Can can any one guide me how this can be achieved?

Answer 1

Five or six years ago, I was stuck writing a network emulation layer for a PS2 game. I was told that all the classic behaviors of an internet connection had to be displayed; realistic loss characteristics, packet reordering, latency, rush-induced packet loss. Essentially, I was told to implement the internet in a couple weeks.

I suggested just bouncing all our game traffic off a remote echo server. When I was told that it was absolutely forbidden to send development traffic out over public wires, I simply created a server that everyone pointed their PS2 devkits at that would store every packet it received and send a doppleganger (full of an id for the original packet plus a bunch of random garbage to make it the same size) out to the echo servers I ran. When the doppleganger was received, I would pass the original packet on to its original destination.

Boom. Internet simulation with all the thorns in less than 8 hours.

UPDATE:

Given the success of the answer here, I reimplemented the game echo service a while back. It seemed that github might be a better place to stash it, so here it is: If it works for you, great! If not, let me know. I expect its current state to be shaky at best.

Answer 2

회 전자 값이 아닌 스피너를 비교하고 있습니다.spin1 및 spin2 변수의 속성을 살펴보십시오. .getSelected() 행을 따라 찾아야합니다.

Answer 3

SharePoint Manager를 사용하여 기존 사이트 모음이나 관련 목록에서 중복 된 필드 ID를 찾으십시오.바라건대 당신은 그것을 발견 할 것입니다.

필드의 GUID를 변경할 수 있는지 궁금해하여 문제가 발생할 수 있습니까?

업데이트 :

Add-PSSnapin Microsoft.SharePoint.PowerShell -erroraction SilentlyContinue
$site = Get-SPSite "http://your.site.com"
foreach($web in $site.AllWebs)
{ 
    #iterates through all the Lists        
    for ($i = 0; $i -lt $web.Lists.Count; $i++) 
    { 
      $list = $web.Lists[$i];                               
      $MyListContentTypes = $list.ContentTypes                                                          
      if ($MyListContentTypes -ne $null)
      {

         $cts = $list.ContentTypes
         foreach($ct in $cts)
         {
              if($ct)                                                            
              {


                $ct.FieldLinks.Delete($ct.Fields["GUID"])                                  
                $ct.Update()
             }   
         }                                  

       }
    }     
  }

.

Answer 4

A simple idea woul be to used User-Mode Linux (UML), a port of the Linux kernel in user space. It allows multiple virtual Linux systems (known as guests) to run as an application within a normal Linux system (known as the host).

It very light, in CPU and memory. For instance I'm using more than 10 UML in the same time on a "not-too-recent" PC, using Netkit, a network simulator based on UML. UML is light because it's a native application, not heavy virtualisation (vmware, virtualbox, qemu) neither para-virtualisation (xen).

As the network interfaces are implemented to be able to connect to other UML machines (using uml_switch), you can have any MAC address you want. If you need to connect these UML machines to your system or external hosts, you can create virtual devices using TUN/TAP.

PS: If you're on Windows, you can try CoLinix, port of Linux Kernel for M$ OS, I don't know if it has same characteristics than UML.

Answer 5

You could try using loopback adapters. Using this you can set any IP or mac address. Works great for emulating various network connections.

Answer 6

you need to study the datalink layer in depth in the part of coding -- then you can understand the how it get mac address and the communication b/w mac and ip

Answer 7

depending on what kind of device you need, you may be happy with a number of virtual PC engines, the overhead is high (whole PC is emulated instead of just a network interface) so you won't end up with 1000 machines, but this is an "out of the box" solution - and each virtual PC can have a number of virtual network cards.

Answer 8

갤러리에서 제거한 경우 WebPart는 목록에서 사용할 수 있으며 현재 사용중인 페이지를 중단해야합니다.

특정 페이지에서만 원하는 위치 만 원하는 경우 웹 파트를 사용하여 범위를 설정하고 해당 특정 범위로 기능을 활성화 할 수있는 기능에 랩핑 된 기능을 제공합니다.)

도움이되기를 바랍니다 :)

Answer 9

Cisco pakcet tracer allows you to emulate network traffic with an gui. Im surpised no one mentioned that (its limited to cisco devices but the standard is same across devices so it would be learning commands for your specific device).

Try doing a google search because under normal circumstances its only available to ccna students but I kept a copy because my teacher let me.

Or you might find someone posted a copy from their class somewhere on the internet.