this post was submitted on 17 Nov 2023
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Hi all,

I'm in a unique situation where my landlord can't log in to his router nor is around/cares to contact the ISP to do so. This is my current setup. Does anyone know how I might go about measuring the latency between the router and my end devices (area shaded in orange)? I'm just curious to see how much my setup is introducing in terms of online games and what not.

And yes, 40 mbps is all we get out in suburban Alaska. Cope with me.

Clarification

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[–] [email protected] 30 points 11 months ago (3 children)

Just ping it?

Actual traffic might be slightly different, but honestly on a LAN you shouldn't need to worry about latency. But you're not going to be able to run iperf3 on that router in any case.

[–] [email protected] 4 points 11 months ago (1 children)

Sounds good, I'll go ahead and just do this. Connect to landlord's router -> ping test -> connect to my router -> ping test. Thanks for the comment!

[–] [email protected] 9 points 11 months ago (1 children)

Or, you know, just ping your landlords router.

[–] [email protected] 2 points 11 months ago (1 children)
Ping statistics for ________________:
    Packets: Sent = 100, Received = 100, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 1ms, Maximum = 5ms, Average = 1ms

So if I understand this, there is barely any latency being introduced here.

[–] [email protected] 2 points 11 months ago (1 children)

Yes, why would expect otherwise?

Unless you've got signal issues, wifi doesn't add more than a few ms

[–] [email protected] 2 points 11 months ago (1 children)

Yes, why would expect otherwise?

Because I know very little about network and is why I’m seeking help/input. Thank you for your input.

[–] [email protected] 2 points 11 months ago

Radio waves travel at close to the speed of light. Latency generally just comes from raw distance, unless the packets are being processed by a slow / overloaded device on route.

If the wifi has to retry a lot due to noise or low signal you'll see loss and latency spikes, but otherwise its very little.

[–] [email protected] 3 points 11 months ago

This is the answer. Although you may need to look up the IP address (a lot of them use 192.168.100.1) and you may need to reconfigure your gateway/firewall/router to route that subnet out its WAN interface while still performing NAT.

[–] [email protected] 2 points 11 months ago

Also if the router blocks icmp for some reason you can always manually send an ARP request and check the response latency.

[–] [email protected] 22 points 11 months ago (2 children)
[–] [email protected] 13 points 11 months ago

This is a cry for help haha, you poor soul

[–] [email protected] 11 points 11 months ago (1 children)

how long did it take you to upload this image?

[–] [email protected] 11 points 11 months ago

About 30 seconds

[–] [email protected] 17 points 11 months ago (1 children)

Tracert will give you the latency of each hop required to make it to your destination. Not sure why everyone is complicating it.

[–] [email protected] 7 points 11 months ago

Thank you, this is exactly what I was looking for. I’ve found essentially less than 1ms of latency between my mini router and my landlord’s router and I’m very happy with that.

[–] [email protected] 10 points 11 months ago* (last edited 11 months ago)

Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I've seen in this thread:

Fewer Letters More Letters
IP Internet Protocol
NAT Network Address Translation
VPN Virtual Private Network

3 acronyms in this thread; the most compressed thread commented on today has 10 acronyms.

[Thread #286 for this sub, first seen 17th Nov 2023, 20:35] [FAQ] [Full list] [Contact] [Source code]

[–] [email protected] 8 points 11 months ago (1 children)
[–] [email protected] 2 points 11 months ago

As a network engineer I use this frequently to figure out where latency is coming from. +1 for mtr

[–] [email protected] 5 points 11 months ago

If you want to test what your equipment is doing to your latency, connect your pc directly to your landlord's router, run latency tests multiple times, then set everything up as you normally would and run the same tests again. Some recommended tests for different situations would be fast.com for netflix/video streaming performance, and https://www.waveform.com/tools/bufferbloat for bufferbloat. Other things you'll want to check for gaming performance are double-NAT and ping tests for the online games you tend to play.

[–] [email protected] 2 points 11 months ago

Do you physically have access to the router? If so, I would figure out the settings it uses that other people notice (wifi settings etc) and just hard reset it. Chances are they just use the basic settings provided anyway.

Is anybody else using the router or just you? If just you, I'd just do what you want to it and reset it when you leave.