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IEEE 802.11n uses the multiple-input-multiple-output (MIMO) technology that enables spatial signal diversity and spatial signal multiplexing enabling increased range and data transmission rates. 802.11n allows use of wider 40 MHz channels to double the bandwidth as compared to the legacy 20 MHz operation.
AirPcap NX adaptors can be configured to capture data on 40MHz channels but you will need to determine the “extension channel” Read more…
A video from The Linux Foundation, commemorating 20 Years of the Linux Operating System: Read more…
Another aide-memoir, these are the setting required to enable a sipgate account (and PSTN number) to connect to a phone registered to your Elastix / Asterisk PBX:
Read more…
Two videos which explain about VRF configuration and troubleshooting. the first is an excellent overview and the second a practical demonstration of VRF configuration:
This video (1 hour 52 minutes in length) is an excellent tutorial / introduction / refresher on the subject of MPLS and MPLS VPN.
Read more…
Attacks on Asterisk-based telephony systems are not uncommon. This video explains how to mitigate some attack vectors:
Read more…
Another Aide memoir:
UNIX SECURITY TECHNICAL IMPLEMENTATION GUIDE
Version 5, Release 1
Can be downloaded from: http://iase.disa.mil/stigs/downloads/pdf/unix-stig-v5r1.pdf
At its core an X.509 certificate is a digital document that has been encoded and/or digitally signed according to RFC 5280.
In fact, the term X.509 certificate usually refers to the IETF’s PKIX Certificate and CRL Profile of the X.509 v3 certificate standard, as specified in RFC 5280, commonly referred to as PKIX for Public Key Infrastructure (X.509). Read more…
This is a link to a brief description of what happens in a Linux system, from the time that you turn on the power, to the time that you log in and get a bash prompt. Understanding this will be helpful when you need to solve problems or configure your system.
http://www.tldp.org/HOWTO/From-PowerUp-To-Bash-Prompt-HOWTO.html
Greg O’Keefe, gcokeefe@postoffice.utas.edu.au
This post describes typical message exchange sequence for a client connecting to a user level server, opening a file, reading its data, closing the file, and disconnecting from the server. Opportunistic Locking (Oplocks) are also explained.
You can also refer tothis capture: Download smbtorture from Wireshark Wiki to further understand the SMB dialogues. The capture was made using the Samba4 smbtorture suite, against a Windows Vista beta2 server. Read more…