How to introduce delay into a network connection?

Question

Computer networks

There is an application that works with remote devices over IP.
It is necessary to test the application for speed in conditions close to combat, but there is a nuance.

Ping to local devices is less than 1ms and everything works fine. The customer to his devices - about 30ms. We have 250-350 ms to the customer's devices, and it's impossible to work. In this regard, the question is, is it possible to somehow introduce a delay to local devices?

I believe that this requires either an alternative driver for a working computer (WinXP / 7), or some kind of shamanism with a router (Mikrotik is used).

Thanks in advance.

Answer 1

for Linux:
tc qdisc add dev eth0 root netem loss 0.1%; #loss
tc qdisc add dev eth0 root netem delay 100ms; #delays

Answer 2

I used Dummynet for similar tasks before
it was only under freebsd, but now it seems to be under linux, windows

Answer 3

The simplest thing I can think of is to rebuild iptables itself and add a routing delay to the source code. Ugly-hack, to be honest.

Answer 4

You can use etcproxy

Answer 5

Perhaps wanem will help you: wanem.sourceforge.net/