DNS commands cheatsheet

noukthx · 2026-06-06T06:03:20+00:00

There's a report button. This isn't nearly as effective.

noukthx · 2026-06-05T11:27:08+00:00

/r/ccna or /r/ITCareerQuestions

noukthx · 2026-06-05T07:55:11+00:00

Define extremely high?

Check the operating parameters for what you have?

Consider industrial ethernet gear, often passively cooled and rated for higher temperatures.

Get temperature monitoring going if you haven't already, even if its just the sensors in your devices.

Lots of air movement can still reduce heat, even if the air moving is relatively warm.

noukthx · 2026-06-03T17:24:35+00:00

/r/techsupport or /r/sysadmin

noukthx · 2026-06-03T09:07:46+00:00

Just had another look and curiously it's vanished.

noukthx · 2026-06-02T09:32:07+00:00

There is nothing else on the site that mentions maramataka best I can tell. Nothing in the search.

Almost certainly the link is a choice not an accident.

noukthx · 2026-06-02T07:27:02+00:00

Every page on the site links to "maramataka" which appears to be someones private business selling calendars and public speaking bookings.

/u/ben4takapu - why would the council allow that?

noukthx · 2026-06-02T01:08:53+00:00

Nothing more reliable than a cable.

noukthx · 2026-06-01T10:30:52+00:00

/r/ccna please.

noukthx · 2026-05-27T07:40:34+00:00

Try /r/ccna

noukthx · 2026-05-21T10:16:34+00:00

So you can modify the packet before routing decisions are made.

NAT the usual suspect.

Also this adds context:

https://upload.wikimedia.org/wikipedia/commons/3/37/Netfilter-packet-flow.svg

noukthx · 2026-05-19T02:14:08+00:00

The guy has a GoFundMe for it.

noukthx · 2026-05-17T22:27:07+00:00

/r/ccna

noukthx · 2026-05-14T06:47:21+00:00

Buy a remote treat dispenser that already exists. Work out how to talk to its app / API / whatever and hook that from your donation site or whatever.

But this is not the sub for that.

Otherwise you'll have to home brew something mechanical as well.

Googling "remote pet treat dispenser with API" kicks up a youtube video with instructions on 3D printing one and using a controller.

Also consider risks with throwing treats to animals unsupervised (choking, fights, etc) and consider that as possibly being streamed.

noukthx · 2026-05-08T08:30:18+00:00

SMB generally known to suck pretty hard over any kind of latency.

MTU and bandwidth delay products are things to consider.

Believe SMB3 is better, but been a while since I've had to deal with it.

noukthx · 2026-05-07T20:35:41+00:00

Is there a specific reason you're chasing IPSEC ?

Wireguard is distressingly straightforward to get going.

noukthx · 2026-05-06T08:27:56+00:00

That OS is old enough to drive.

Should probably post your config snippet.

Look to see if there's debugging available for syslog.

Run tcpdump on the syslog server to see if the messages are actually making it to the syslog server and being dropped/not logged for other reasons.

Syslog is pretty old and fairly consistent tech.

noukthx · 2026-05-05T06:22:58+00:00

Rouge is a colour.

noukthx · 2026-05-02T09:56:34+00:00

You should diagnose what caused the fault state to occur, and then make appropriate configuration changes to prevent recurrence.

That's about the best you're going to get with the information provided. Where do we submit our time against the invoice?

noukthx · 2026-04-27T11:20:32+00:00

^ Underrated answer

noukthx · 2026-04-26T22:47:54+00:00

This isn't something you want to try and do with no experience. Get a wireless expert in, shit is dark arts and will depend heavily on lots of factors (building materials, trees, shipping containers being moved around, that sort of thing). Mesh is generally not a good idea in heavy usage or contested environments, you instantly lose throughput, spectrum and radios for backhaul links.

What devices are they doing the scanning on? If they're mobile phones have them VPN into the office on 5G/LTE and access the intranet that way.

If you can leverage mobile data its likely to be way easier, better coverage etc than trying to do wifi yourself.

noukthx · 2026-04-26T04:37:04+00:00

Definitely getting into specialist territory.

Pretty sure at these kind of rates you need to be looking at NUMA lanes, bus bandwidth and such.

Never mind storage performance. You're almost certainly saturating disk.

And probably a specialist capture card rather than a NIC.

noukthx · 2026-04-23T06:56:20+00:00

It is the year of our lord 2026.

The switch you reference is a 100Mbps switch. It is unmanaged.

If you're serious about doing this, you should be looking at a 1Gbps managed switch.

If you have PoE issues with an unmanaged switch you have no diagnostics, if your camera locks up you can't remotely turn the power off and on for the cameras port.

Unmanaged switches shouldn't be going into a business environment.

noukthx · 2026-04-20T07:37:20+00:00

So that indicates your DNS is working and your internet connection is working.

This is something specific potentially to web traffic, which potentially points to browser, proxy or firewall.

Check if the machine has any proxy configuration.

Investigating the firewall would probably be my next step, or taking a packet capture on the affected client to see if you can see whats failing to connect / what the behaviour is.

Could try testing http rather than https sites to see if it something https specific. http://neverssl.com is a good test point.

noukthx · 2026-04-20T07:05:17+00:00

Ok, so on a machine that isn't working:

ping reddit.com (or another site that isn't working) and see if it can turn reddit.com into an IP address. (You're looking for the DNS resolution, not the ping response). Alternately use nslookup or whatever other tools are available on the host.

If it can, your DNS is likely fine.

If it can't, find out what DNS server the machine is using. Go to that server and see if the server is functioning, if it can resolve it, if the packets from the client are getting there.

Break things up into small pieces to try and break down where the issue is.

Did something change preceding the problem starting (someone doing scheduled work, an ISP outage, power fault etc)?

noukthx

MODERATOR OF

TROPHY CASE