This error message suddenly showed up on one of my router when I tried to save its running configuration. service compress-config allowed me to workaround this buffer problem :
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Category Archives: Network
Connecting your GNS3 labs to the real network
There is a nice video tutorial to get your GNS3 lab connected to your physical network. However, it requires you to use a real network card with a fixed IP for doing that. This is not really handy if, llike me, you use GNS3 on a laptop whose connectivity is frequently switching between cable and [...]
Introduction to network attacks : Physical Layer
That will be a short article, mainly because of two things. First, some methods are beyond my knowledge, involving electronics or hardware manipulation. Second, such methods are not efficient compare to higher level ones, and so rarely used. The mere concept of a physical attack implies that you have a direct physical access to your [...]
Practicing Cisco networking with GNS3 and Dynamips
GNS3 and Dynamips put together give a nice open-source and free alternative to emulate a network with IOS routers. Dynampis is an emulator of Cisco 7200 router, while GNS3 provides a nice graphical environment to design your network and use the virtual routers. I sometimes use Boson Netsim, which is not only non-free but not [...]
About network attacks…
I will post later a few examples of network attacks. But, before that, I want to clarify what I call a network attack. I see many people making a confusion about the use of this term, even among professional or specialized journalists. Whenever there is a hack originated from the Internet, they call it a [...]
Postfix : TLS not working outside my network
As I just finished setting TLS and SASL to secure the access to my Postfix server, I realized that it was working only from inside my network. What I got from my lan : I shows well that the TLS handshake is initiated. But from this outside, I just got this weired thing : Of [...]
Hacked !
This blog got hacked yesterday. It looks like some spammer managed to inject some PHP code into almost all *.php files of WordPress. It was not just like the classic SQL injection that is usually used to post some malicious post. The following code was added :
How to connect to a Cisco device using the serial port on Linux
Using the serial port is still necessary to manage some devices, when it is reseted to factory defaults. It could be also a security choice… Nowadays many computers – and especially laptops don’t have anymore a built-in serial port. Not a problem, there are many cheap serial-usb converters like this. As an alternative to the [...]