A beginner DNS presentation from RIPE NCC that shows how a simple DNS query is resolved «behind the scenes»…
The RIPE NCC is pleased to announce the launch of the first module of our DNSSEC e-learning course, entitled «DNS Basics».
This introductory module explains how DNS works by following a simple query, and can be viewed at:
In the coming months we will be releasing several more modules. Next up are:
Module 2: DNS Vulnerabilities
Module 3: DNSSEC
The RIPE NCC E-Learning Centre is a free-of-charge service available to everyone. If you have any questions, please feel free to contact us at <email@example.com>.
Training Services Manager
Network Inventory .. What a nightmare to keep up-to-date!
Luckily, if you use Cisco switches, CDPR is here to help you discover where do all your network cables end up.. Simply run it on your linux server, wait a few seconds, and your cisco switch will broadcast the info.
Read about it at http://www.debian-administration.org/article/Where_art_thou_-_CDPR.
The opposite is also useful as well.. A daemon run on linux systems that speaks Cisco Discovery Protocol, thus showing up on your switch’s cdp neighborhood ..
I found cdp-send of cdp-tools that works, but ladvd works better with bonding :)
sw-02>show cdp neighbors
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone
Device ID Local Intrfce Holdtme Capability Platform Port ID
sw-01 Fas 0/23 150 S I WS-C3550-1Gig 0/4
router-01 Fas 0/24 158 R 3640 Fas 0/0
linux.local Fas 0/19 176 H Linux eth0
sw-02>show cdp neighbors detail
Device ID: linux.local
IP address: 192.168.1.11
Platform: Linux, Capabilities: Host
Interface: FastEthernet0/19, Port ID (outgoing port): eth0
Holdtime : 160 sec
Linux 2.6.18-92.1.22.el5 #1 SMP Tue Dec 16 11:57:43 EST 2008 x86_64
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