The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘UDP’ Category

GL.iNet GL-SFT1200 Secure Wi-Fi Router On The Go – AC1200 Dual-Band Gigabit Wireless Internet Router | IPv6 | USB 2.0 | MU-MIMO | 128MB RAM | Repeater Bridge | Access Point-M Mode: Amazon.de: Computer & Accessories

Posted by jpluimers on 2025/12/09

For my link archive a router I bought a few years back: [Wayback/Archive] GL-SFT1200 Secure Wi-Fi Router On The Go – AC1200 Dual-Band Gigabit Wireless Internet Router | IPv6 | USB 2.0 | MU-MIMO | 128MB RAM | Repeater Bridge | Access Point-M Mode: Amazon.de: Computer & Accessories

  • It is USB-C powered (the power brick delivers 3A at 5V, but in reality it uses far less).
  • Mode and reset buttons are behind the antenna (see picture below).
  • It is specced as AC1200, but that’s just theoretical a number.
  • It came with EU and UK plug.

I needed it because from prior experience, I knew GL.iNEt can support a special Wireless Repeater mode where it still functions as a router (hiding the LAN/WLAN behind NAT)

connection method

Two physical drawbacks likely due to the portable nature:

  1. the plastic RJ45 ports are slightly too wide which means that these keep falling out [Wayback/Archive] Inline® Dust cover, for RJ45 socket, color: green, 100pcs. Pack: Amazon.de: Electronics & Photo
  2. no holes in the base to hang it to a wall

One firmware drawback: it shipped with v3.212 for which I could not find release notes. Luckily the firmware v3.215 I upgraded to had: [Wayback/Archive] Firmware v3.215 is released – Technical Support – GL.iNet.

Links to product and manuals (the paper manual are just two thin sheets, but the on-line documentation is OK; I was surprised WireGuard and Tor were supported!):

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Posted in Communications Development, Development, DHCP, Ethernet, GL.iNet, GL.iNET GL-SFT1200, Hardware, Internet protocol suite, Network-and-equipment, Power User, routers, UDP, WiFi, Windows, WinSCP | Leave a Comment »

In case I need a small 5-port managed switch that can do port-mirroring: GS305E | Easy Smart Managed Essentials Switch | NETGEAR Support

Posted by jpluimers on 2025/08/13

[Wayback/Archive] GS305E | Easy Smart Managed Essentials Switch | NETGEAR Support which can do many-to-one port mirroring.

This is a newer and cheaper hardware revision than the:

  • GS105Ev2 (which is managed and can do port-mirroring, and is confusingly sold as GS105E-200) which in Germany already is end-of-life
  • GS105Ev1 (which is unmanaged and cannot do port-mirroring and is confusingly sold as GS105E-100) which is end-of-life but still sold

Via [Wayback/Archive] Everyone Should Have One of These – EASY Packet Capture! – YouTube who explains very well why you need a switch that can do port-mirroring, then recommends the GS105E but forgets to mention:

  • there are different revisions of the GS105E with the above drawbacks
  • there is GS305E

Related:

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Posted in Blue team, Communications Development, Development, Ethernet, Hardware, Internet protocol suite, Network-and-equipment, Power User, Red team, Security, Software Development, TCP, UDP | Leave a Comment »

Guess the maximum DNS Response Size… (by Jan Schaumann)

Posted by jpluimers on 2023/12/26

Every once in a while Jan Schaumann writes a long Twitter thread and saves it in a blog post. Always good ways to learn. This time it was no different: [Wayback/Archive] DNS Response Size started with

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Posted in Communications Development, Development, DNS, Internet, Internet protocol suite, IPv4, IPv6, Power User, TCP, tcpdump, UDP, Wireshark | Leave a Comment »

🔎Julia Evans🔍 on Twitter: “ten questions about UDP”

Posted by jpluimers on 2021/11/10

From a while back, but still relevant when you learn all your life:

[Archive.is] 🔎Julia Evans🔍 on Twitter: “ten questions about UDP: “

[WayBack] UDP questions

Hello! Here are some questions & answers. The goal isn’t to get all the questions “right”. Instead, the goal is to learn something! If you find a topic you’re interested in learning more about, I’d encourage you to look it up and learn more

–jeroen

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Posted in Communications Development, Development, Internet protocol suite, Software Development, UDP | Leave a Comment »

Most network protocols are TCP based, so be aware ping uses ICMP and traceroute UDP

Posted by jpluimers on 2021/09/08

Interesting thread: [WayBack] SwiftOnSecurity sur Twitter : “I had this issue in my prev company network. QoS will drop ICMP and you’ll chase your tail. If you want to find out if a network service works, test the service. If you want to know if TCP works, use TCP.… “

So:

  • tcpping and tcptraceroute for the win!
  • remember that some protocols, rely on ICMP or UDP, so ensure these work on your network tool (do not QoC them away!)

[WayBack] Zimmie on Twitter: “It is perhaps worth noting: traceroute does not generally use ICMP. Instead, it uses this horrific UDP port range with a different port for every probe at every hop. 30 hops? That’s 90 different UDP ports you just tried. Makes its value questionable at the best of times.…”

Related:

–jeroen

Posted in *nix, *nix-tools, Communications Development, Development, Power User, TCP, UDP | Leave a Comment »

Happy birthday UDP!

Posted by jpluimers on 2020/08/20

Today it’s the 40th birthday of UDP. Or more precise: 40 years after [WayBack] RFC 768 – User Datagram Protocol got submitted.

It is still used a lot today, so be sure to read more background on [WayBack] User Datagram Protocol – Wikipedia.

And of course on a birthday, it is nice to have few good jokes. So here we go:

[WayBack] “I would tell you a joke about UDP, but you probably wouldn’t get it.” | Hacker News

[WayBack] I would tell you a joke about UDP, but you probably wouldn’t get it. So here’s a TCP joke | reddit.

[Archive.is]:

  • UDP packet bar walks into
  • The best thing about UDP jokes is that I don’t care if you get it. #sysadmin #IT

You can generate more yourself: udpjoke.py

–jeroen

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Posted in Communications Development, Conference Topics, Conferences, Development, Event, History, Internet protocol suite, UDP | Leave a Comment »