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!

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jumpNet topology update March 2018

As I wrote some weeks ago, the jumpNet is now interconnected with dn42. You'll find a new network map in this article.

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Building a L2TP/IPSec server with OSPF routing capability

Over time, jumpNet's VPN servers became bottleknecks regarding bandwidth. Currently, the best VPN server in jumpNet offers 20MBit/s upstream, which is okay but not sufficient for large file transfers like backups. In this article, I describe how to build a L2TP/IPSec VPN server with OSPF rotuing capability.

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Interconnection between jumpNet and dn42

jumpNet is fine - no question. But it's small and some how I got used to it. There is little new to discover (maybe I'm going to realize a point-to-point radio link this summer, but that's another story) and so I decided to follow up an old plan: Connecting the jumpNet to dn42.

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ECMP routing - equal-cost multi-path routing

As you propably know, the jumpNet has a redundant VPN infrastructure and is using OSPF. To improve the network design futher, I investigated the possibility of equal-cost multi-pathing. Doing so I needed to tackle a little with the stateful firewall.

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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.

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(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.

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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...

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MPLS - what is that?

In the past years, I learned a lot about the technologies used in the internet and apart from some people dealing with them every day, nobody knows. One of these technologies is MPLS. I read a lot about it but never tried to set it up myself. Here we go...

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jumpNet

The jumpNet is a private computer network to experiment with. It started with a VPN tunnel between two friends and is now connecting sites in Freiburg, Offenburg, Munich and Nuremberg.

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