A few years back we had a Acterna Testpad FST2802 (datasheet) on loan from a vendor to test a big rollout of fiber we did together. As we only had one unit we couldn't use it to test other things then the rollout where the vendor had the other unit. So I decided to write a little software program to act as a software based reflector.

While troubleshooting a bandwidth issue for a customer today I noticed a lot of TCP traffic between different hosts of the customer on tcp port 7680. As the customer has multiple locations with diverse bandwidths available this started to hog up quite some bandwidth. After some research I found out that tcp port 7680 is used by Windows 10 to distribute windows updates to other domain clients. 

Plex uses it's own certificates pointing to <uuid>.plex.direct for it's internal indirect modus. As I use plex mainly using chrome it would be nice for it to have a valid certificate. This is based on plex on ubuntu 17.10. I got inspired by the following gisthub post.

I recently added some fibrechannel cards to my personal vmware server, but was unable to find the WWN's using the esxi webclient. A quick google showed me that the easiest way is to use the cli.

While using homeassistant in cooperation with the Unifi Controller I regularly see that the homeassist logfiles complains about self-signed certificates. So I wanted to install a legitimate certificate, the obvious choice for a CA would be letsencrypt. 

Recently I have setup two different lorawan gateways for The Things Network. They are based on different concentrator boards.

While plucking some old blog entries using the way back machine I re-encountered the Skinny/SCCP proxy we wrote with a little team back in 2002 as we had some cheap Cisco 12SP/30SP phones. 

To be sure it's not lost to /dev/null I reposted it on github, for everyone to enjoy and maybe steal some stuff from it.

These days there are many public BGP analytics services which all need data to analyze. Ofcourse you could peer directly to it from your BGP routers, but I wanted to seperate it a bit more.

I choose to use bird as a collector for the routes and distribute them to multiple services. As I personally didn't find many examples for BIRD here is mine (privatized a bit here and there)

I recently acquired a used MGE Pulsar Evolution 2200 UPS from work where it was no longer used. It had no working batteries anymore, and there are no replacement battery packs from MGE available anymore. After googling a bit and reading the user manual I found it it is pretty easy to do yourself. There is also a youtube video about the MGE 3000 but it is the same way as with the MGE2200.  You just need the following items:

This is an old post, I posted here a couple of years ago for Arjen Halma. It was the first one I found, so i'm putting it back here for reference.

interface Tunnel0
 description tunnel to other side
 ip address <PTP-IP> <PTP-NETMASK>
 no ip redirects
 no ip unreachables
 no ip proxy-arp
 ip mtu 1480
 ip tcp adjust-mss 1420
 tunnel source Dialer0
 tunnel destination <TUNNELSERVER>
 tunnel mode ipip

Add additional routes for the network on the other sides ;)