How to Add Latency for Testing?

RouterOS General
1

I want to add latency for testing purposes. I imagine one of the queue types could be configured to induce latency, but I do not have a solution figured out yet. I’d like to be able to introduce round trip delay adjustable from 5ms to 500ms.

Any suggestions? I don’t actually want speed limited, just the time delay introduced.

Thank you, Chris

SMB over VPN extremely slow – looking for suggestions or diagnostics
2

i got one to simulate timeout:

/ip firewall filter
add action=drop chain=input nth=2,1 protocol=icmp src-address=x.x.y.y

not sure whether is possible to increase the latency

3

You need a linux machine for that. The tool to use is netem. To introduce a 500 ms delay for a 1 Gbit/s stream in one direction, you have to store 500 Mbits, i.e. roughly 50 Mbytes, of data in the queue. So on a device with enough RAM, you may be able to achieve this using containers (currently available only on arm, arm64, and x86 CPU architectures in ROS 7).

4

linux has tc netem available, but I don’t know if MikroTik exposes it (without a container as @sindy mentioned)

Here are some links with documentation.

https://wiki.linuxfoundation.org/networking/netem

Linux Traffic Control WAN Emulation

Using Linux NetEm to emulate a network

Simulating Network Latency, Bandwidth and Packet Loss with a Raspberry Pi

5

try limiting traffic below the normal speed you achieve with a simple queue using a queue type with a very big size (take in count memory available on the router)

6

Thank you very much - NetEm provides the exact functionality I was looking for!

It would be nice if it was exposed in RouterOS, but I’ll just setup a separate system for it for now.