Networking

Honeyd is a small daemon for Linux (now also available for Windows) to simulate multiple virtual hosts on a single machine. It is a kind of an interactive honeypot. The latest release can be downloaded from Honeyd release page. For my project, I have been working with honeypots, and Honeyd is one of them. During the initial stage, I faced some problems while starting the basic setup of some personalities with Honeyd. Here I recall those problems and some misconfigurations which can result in errors (mainly: config file parse error) and can be a problem for first time users. ...

Hello! One more post for the day. Until now, I have been using the 3G internet by Tata Docomo. They were generous and gave me IP addresses without any kind of conversion. Means whatever IP I get on my ppp0 interface with ipconfig, is the same IP I get by the Google search ‘whats my ip’. Though they were dynamic IPs, they reached me without any translations. Last week I switched to a new provider, Vodafone 3G. I don’t know what kind of addressing scheme they are using, but definitely they gave me something more with the IP. Here on my laptop, on the ppp0 interface I have private IP address of 10.119.69.xx, which is further translated by NAT at their side and converted to 1.38.29.123. Mostly we (here ‘we’ refers to the whole group of people whose NAT address is converted to the specified IP, and you can consider the number of people in a class-A scheme) are given that IP address on the outside, while the inside address keeps changing. ...

Back here, writing after a long time! Let me point down some of the major incidents during that time – Attended the High Performance Computing workshop by CDAC-ACTS The workshop on High Performance Computing was really a nice arrangement by CDAC for the students to learn and be familiar with the parallel processing. They offered the supercomputer access to perform the OpenMP and MPI programs, along with nice practical teaching from the HPC experts. ...

SMDS, or Switched Multimegabit Data Service, has not yet gained significant market penetration, although it has begun to experience some growth. SMDS was viewed as a stepping stone to ATM, since some of the communications equipment and media are common to the two technologies. As SMDS is not available everywhere, and there is more interest in ATM, SMDS has had a hard time getting into the mainstream. SMDS does, however, have some penetration; if your long-distance carrier is MCI, you may have cause to use this technology. The attraction of SMDS is that it has the potential to provide high-speed, link-level connections (initially in the 1 to 34 Mbps range) with the economy of a shared public network, and exhibits many of the qualities of a LAN. ...

Hello you! Since 3 months I was preparing for the Network+ and CCNA certifications. I had planned to appear for the N+ after my final exams and CCNA after gaining some industrial experience with computer networks. Then I had a thought of appearing for the N+ during my reading vacations before the final exams – so as I can give my full time for job hunting after the university exams. And on 27th I went to the Pearson VUE Exam Centre, Baroda for my first networking certification exams. I was fully prepared for the exams – intense work for 1 week – from CBT Nuggets, Network+ Study Guide by Todd Lammle and my practical experience in the industry during my college projects. And my hard work showed the results – passed the exams with 790 marks! I am very glad to have such a glorious result in my first ever networking certification. Now eagerly waiting for the certification kit with hard copy of the certificate having my name printed on it! ...

As part of my college project work, I am developing a secure network at a medium sized office. Last week I completed the configuring of the wi-fi router with the normal protocols as well as some security features. Prior to developing the physical network, I tested the network with all its preferences in two different network simulators for its successful working (mainly for the IP address assigning). Let me describe you the techniques which I used in the router configuration – ...

What is HDLC? HDLC stands for High-Level Data Link Control protocol. Like the two other WAN protocols mentioned in this article, HDLC is a Layer 2 protocol. HDLC is a simple protocol used to connect point to point serial devices. For example, you have point to point leased line connecting two locations, in two different cities. HDLC would be the protocol with the least amount of configuration required to connect these two locations. HDLC would be running over the WAN, between the two locations. Each router would be de-encapsulating HDLC and turning dropping it off on the LAN. ...