I need to simulate network latency to a program running on the local computer, connecting to a local service. Thus far I have tried dummynet (a windows build of ipfw) which I got working after some trial and error. While it generally works, I can't seem to get it to filter localhost traffic. Even after adding a rule from any to any which affects external traffic, this makes no difference for local connections. I would appreciate if anyone knows how to simulate local latency using dummynet or a different tool. The tool should be able to simulate latency generically in IP packets, (TCP and UDP) and not be protocol specific.
Windows – Simulating network latency for localhost connection on Windows 7
ipfwlatencynetworkingwindowswindows 7
Related Solutions
Aha! It works if we reverse the order of the commands.
tc qdisc add dev lo root handle 1: htb default 12
tc class add dev lo parent 1:1 classid 1:12 htb rate 20kbps ceil 20kbps
tc qdisc add dev lo parent 1:12 netem delay 1000ms
https://lists.linux-foundation.org/pipermail/netem/2010-May/001388.html
The developer tools in 10.7 come with a prefPane for emulating a limited network connection:
Best Answer
On windows 7 you should take at Clumsy: