How do I simulate a low bandwidth high latency environment

Question

I need to simulate a low bandwidth  high latency connection to a server in order to emulate the conditions of a VPN at a remote site  The bandwidth and latency should be tweakable so I can discover the best combination in order to run our software package

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For macOS  there is the Network Link Conditioner that simulates configurable bandwidth  latency  and packet loss  It is contained in the Additional Tools for Xcode package

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To simulate a low bandwidth connection for testing web sites use Google Chrome  you can go to the Network Tab in F12 Tools and select a bandwidth level to simulate or create custom bandwidth to simulate

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For Windows you can use this application  http   www softperfect com products connectionemulator   WAN Connection Emulator for Windows 2000  XP  2003  Vista  Seven and 2008    Perhaps the only one available for Windows

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I guess tc could do the job on UNIX based platform   tc is used to configure Traffic Control in the  Linux  kernel http   lartc org manpages tc txt

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I ve been looking for an easy to use tool for this type of testing for a while now   I just came across this the other day   Network Delay Simulator  If you re running Windows  you should check it out   It was super easy to set up and get going  and seems to work really well   It allows you to define bandwidth  latency  and packet loss in each direction   The other really nice thing is that you can define  Flow Match Conditions  so that it only affects the traffic you want it to   Oh yeah  and it s free

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Found this one for Windows using Fiddler  free solution  http   www logic-worx com index php tools-and-apps fiddler-connection-simulator

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Charles I came across Charles the web debugging proxy application and had great success in emulating network latency  It works on Windows  Mac  and Linux    Bandwidth throttle   Bandwidth simulator Charles can be used to adjust the bandwidth and latency of your Internet connection  This enables you to simulate modem conditions using your high-speed connection  The bandwidth may be throttled to any arbitrary bytes per second  This enables any connection speed to be simulated  The latency may also be set to any arbitrary number of milliseconds  The latency delay simulates the latency experienced on slower connections  that is the delay between making a request and the request being received at the other end   DummyNet You could also use vmware to run BSD or Linux and try this article  DummyNet  or this one

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If you re on linux  I find the Traffic Control program to be a great help for this sort of thing

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You can try this  CovenantSQL GNTE just write YAML like this   group    -      name  china     nodes        -          ip  10 250 1 2         cmd   cd  scripts  amp  amp    YourBin args        -          ip  10 250 1 3         cmd   cd  scripts  amp  amp    YourBin args      delay   100ms 10ms 30       loss   1  10     -      name  us     nodes        -          ip  10 250 2 2         cmd   cd  scripts  amp  amp    YourBin args        -          ip  10 250 2 3         cmd   cd  scripts  amp  amp    YourBin args      delay   1000ms 10ms 30       loss   1  10    network    -     groups        - china       - us     delay   200ms 10ms 1       corrupt   0 2       rate   10mbit    run   generate scripts your yaml

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Try WANem  WANem is a Wide Area Network Emulator  meant to provide a real experience of a Wide Area Network Internet  during application development   testing over a LAN environment

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There s an excellent writeup of setting up a FreeBSD machine to do just this - take your standard old desktop  toss in an additional NIC  and build   The writeup is available at http   www freebsd org doc en articles filtering-bridges article html   In step 5 of the above instructions  you re enabling a firewall  For just simulating a different IP connection  you could  for example  do the following   Create a file  etc rc firewall 56k which contains the following   ipfw add pipe 1 ip from any to any out ipfw add pipe 2 ip from any to any in     ipfw pipe 1 config bw 56Kbit s    ipfw pipe 2 config bw 56Kbit s   And change  etc rc conf    replace the line   firewall type  open    with   firewall type   etc rc firewall 56k    reboot  and you ve got yourself a 56K bridge   If you happen to be working from a Macintosh  that OS has ipfw built into it by default  I ve done the same thing by routing network traffic over the Airport and through the ethernet  setting it up so that anything coming over the airport has the same characteristics as whatever I m trying to emulate  You can invoke the ipfw commands directly from the terminal and get the same effects

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Another client-side program  Windows only   is NetLimiter - http   www netlimiter com

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I would try using netem on linux   With it you can simulate additional delay  corruption  packet loss and duplication   It even works on the loopback device

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In the past  I have used a bridge using the Linux Netem  Network Emulation  functionality   It is highly configurable -- allowing the introduction of delays  the first example is for a WAN   packet loss  corruption  etc  I m noting that Netem worked very well for my applications  but I also ended up using WANem several times  The provided bootable ISO  and virtual appliance images  made it quite handy

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Take a look at the NE-ONE Network Emulator which allows you to configure bandwidth  latency  packet loss  packet reordering  packet duplication  packet fragmentation  network congestion and many more impairments so that you can create real-world network conditions in the lab   Different impairments can be configured for the up and downlink so you could have a really good uplink but a really bad downlink experience  great for seeing how the app handles TCP queuing because the acks don t come back in a timely manner and the overall latency therefore increases   There s an overview video here http   www youtube com watch v DwtqlE7LcrQ specifically aimed at game developers  but it shows what it s about   NE-ONE is configured using a web browser so it s really easy to get installed and configured - you don t need to be a network guru  -    There s a hardware version - http   www itrinegy com index php products network-emulators ne-one - or you can download a Virtual Appliance  software  version that runs under VMware ESXi Server   The Virtual Appliance can be download from VMware s Solution Exchange - solutionexchange vmware com store products ne-one-flex-network-emulator

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LANforge ICE is a network emulator  with an emphasis on virtual routing  jitter  corruption and delay  Projects have used it to emulate satellite link  cable and modem connections  and high-speed  10Gbit  wan emulation  You can use a Java GUI to build your virtual networks and generate very detailed reports of the traffic flow  The LANforge products also provide traffic generation features  frame  ethernet  layer-3 and stateful traffic  NFS  http   Recent editions for LANforge have sophisticated WiFi testing features as well

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There is a product from http   www shunra com called VE Desktop which can be used to simulate varying network conditions  It allows you to tweak latencies  bandwidth and packetloss with a simple UI  Only caveat is  its not free  Hope this helps

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I found this little neat program for Windows called clumsy  It s in kind of alpha status  but it seem to work fine for me  and it s open source   Edit  Others have noticed that you can t limit bandwidth with clumsy  and that s true  You can only add Latency and a couple of other network related errors  This will disqualify this answer as a valid answer to the question  however since I had good use for it when I wanted to simulate a bad network so I ll leave it here as long as it has   0 votes or similar

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I use NetBalancer on my Windows machine   http   seriousbit com netbalancer   Updates on 2017-10-07   The last free version of NetBalancer is 9 2 7   The program has a hard-coded expiration date   Before you start the NetBalancer service  you need to turn back the system clock before 2016-10-18   See this article for details

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i think i found what i need  maybe you can use charles proxy or slowy  hope it helps

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