Projects

Have fun browsing my projects. In case you have any questions, don't hesitate to contact me. I'll answer your e-mail as soon as possible!

If you're interested in a RSS feed, you'll find it here.

Finally, you can filter the projects by tags:

jumpNet topology update and change of VPN technology

Two more sites joined the jumpNet and we swapped the vpn server hardware. Now, the core of the jumpNet is powered by two RB750Gr3 or hEX.

Read more …

(MikroTik) IPSec: I can't ping the router itlsef. Why?

I just configured some IPSec tunnels to connect the management network to our company's local network and stumbled over a well known problem: I can ping hosts "behind" the router doing IPSec, but I cannot ping the router itself. Read why and how to circumvent this issue.

Read more …

I was a webhoster

Several years ago, I was interested in webhosting technologies. As servers and elecricity didn't pay for themselves, I founded a small web hosting business to fund my hobby.

Read more …

Vodafone - what the hell is going on? [last update 09.01.2017]

When I moved to Freiburg some years ago, I ordered my internet access from Arcor. Some time ago Arcor was bought by Vodafone and I involuntarily became a Vodafone customer. The transisition from Arcor to Vodafone went smoothly, but now, I'm experiencing odd issues with my Vodafone line...

Read more …

Zyxel IES 1000 / AAM1212-51 splitting traffic over two ethernet ports

The AAM1212-51 comes with 12 ADSL2+ and 2 Ethernet ports. Every ADSL port is capable of handling up to 24MBit/s traffic. In default configuration, 4 fully loaded ADSL ports will saturate one ethernet port. So, how to share the load over the two ethernet ports?

Read more …

My lab setup

Devices are piling up on my desk, blocking the sunlight and provoking my friends to joke around nerds not needing light. I needed a pratical solution ;-)

Read more …

HP ProCurve 4000M modular switch

I could save a HP ProCurve 4000M from the bin. The 4000M is quite old, but still a great switch if you're okay with 100MBit/s and 4U device height.

Read more …

2/2 IPSec over GRE with MikroTik's RouterOS and Linux

This is the part 1 of 2 explaining how to create GRE tunnels between a linux server and a MikroTik Router

Read more …

1/2 IPSec over GRE with MikroTik's RouterOS and Linux

This is the part 1 of 2, providing explanations and How-Tos for:

  • creating GRE tunnels between a linux server and a MikroTik Router
  • configuring IPsec to encrypt the traffic on the GRE interfaces

Read more …

Simple traffic graphing

To see to what extent the jumpnet is used and to determine the utilization of Jens' internet connection (he's the hub in our hub-and-spoke network topology) we need a simple traffic graphing tool. This is where MRTG comes into play. This article describes how to configure MRTG and MikroTik to graph the traffic.

Read more …