I’m doing the network prototyping for my Product Development group project and the plan is to establish 3G connectivity on the RaspberryPi. I’m using a 3G USB Dongle from TDC, the primary ISP in Denmark. The model for the USB is E3131-s2 from Huwaei. Apparently all E3131 models are the same, with a small difference in supported operating frequencies. For the S2 model, it’s limited to 2100/900MHz, as we can see on the producers page. Continue reading “Raspberry Pi and 3G connectivity from TDC Denmark”
Scanamenities workshop
Yesterday we had a one day workshop, where we had the task of generating some concepts for the 3rd generation of soap dispensers from Scanamenities, danish based hotel amenities supplier. Their goals is to approach the US market and become world leader in the field of hotel amenities. According to their founder, they are currently in the top 5 in this above mentioned market. Continue reading “Scanamenities workshop”
Categorizing IP addresses when monitoring
When monitoring a network one must keep in mind different known or unknown IP addresses. For a monitoring system setup i would first clasify the IPs that i will be interacting with in several categories:
- Machine/network specific addresses
- Home network addresses
- Reserved and assigned addresses
- External network addresses Continue reading “Categorizing IP addresses when monitoring”
Spreadsheet ### error
I ran upon a strange error in an Excel spreadsheet the other day – 4 digit numbers are displayed as a “###” . Even more strange is the fact that i do no had this problem on another sheet in the document. Continue reading “Spreadsheet ### error”
Custom laptop battery notifications
Since i bought my laptop, i was concernead of the long-term effects of keeping it plugged in constantly. A lot of people do this and apparently, it shortens the battery life. I wanted an app or a script that could show me the battery notifications that i wanted – notify me when the battery is charged or discharged at a custom level. I think it’s optimal to keep it charged until 90% and not let it discharge below 20%. Since i didn’t find anything that fitted my needs i decided to make my own script. Continue reading “Custom laptop battery notifications”
Networking-student photo session
I was approached by a student doing her internship for the school. She’s doing a booklet that will describe “A day in the life of a Computer science and IT Technology student”. And yes, you guessed it, i’m going to be the (not so) average IT Tech student. The photos have been taken in the Juniper (former Cisco) lab down at Ejlskovsgade 3, Odense. The pictures look like i’m straight advertising for Juniper, but that shouldn’t bother anybody. Continue reading “Networking-student photo session”
Mounting a TrueCrypt volume from the command-line
If you are reading this post, i’m assuming that you know about TrueCrypt and that you already have an encrypted volume created. Sometimes i’m much faster using just the command line, so i wanted to access my encrypted volume quickly. Continue reading “Mounting a TrueCrypt volume from the command-line”
Impressions from Karrieredagene 2014
Like i was saying 2 weeks ago, today i went to this carrer day event in Odense. I came right from the beginning, having the chance to experience Layer 1 problems with the name tag printing. Of course it was not working and you had to register again and try other several label printers, but i finally got it. Continue reading “Impressions from Karrieredagene 2014”
Protect against ARP-spoofing
In a previous article i’ve talked about how you can sniff traffic on LAN using ARP. In this article we are going to see how we can prevent our traffic from being sniffed.
ARP-spoofing works because of the big flaw in ARP, which is that of anybody on the network having the posibilty to repsond to ARP-requests. To prevent machines on the network and routers getting confused we must set up static ARP table and/or configure each of the machines separately. Continue reading “Protect against ARP-spoofing”
Understanding the Snort architecture
Snort first started as a packet sniffer. Another common example of a packet sniffer is tcpdump, or its graphical big brother Wireshark. In order to evolve into the IDS software that it is today, Snort added a few things in its architecture. It currently functions as a core with plug-ins system, where its primal component (the sniffer) is the core and the other elements act as plug-ins. Continue reading “Understanding the Snort architecture”