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DHCP debugging with tcpdump
tcpdump filter to match DHCP packets including a specific Client MAC Address: tcpdump -i br0 -vvv -s 1500'((port 67 or port 68) and (udp[38:4]= 0x3e0ccf08))' tcpdump filter to capture packets sent by -
Exchange
Exchange is Microsoft's mail server program. Check version[] Open Exchange System Manager, Click on the "Servers" folder, On the right-pane, there's a column for edition and one for server version -
Windows desktop search
Windows desktop search has had alot of issues on Windows XP, therefore alot of people wish to uninstall it. Unfortunately, one of the many issues is the uninstallation of it. First try uninstalling normally from -
SSH Key Authentication
It has become increasingly widely known that SSH authentication can be passwordless or semi-passwordless using a cryptographic strategy known as PKI or Public Key Infrastructure. Unfortunately, far too many people, professionals and amateurs alike -
VMware
VMware is a virtual machine. There are both freeware and paid versions available. You can either download a 21 KB zip file with all sorts of ready VMware images or if you want custom sizes -
Xen
Xen is an open source virtualization solution. Find the host UUID and set a variable for it, like this: xe host-list hostUuid=12345678-1234-1234-1234-12345678 -
Windows
Windows is a series of software operating systems and graphical user interfaces produced by Microsoft. Execute commands on remote windows computers from windows and linux, with psexec and winexe, respectively. For instance to restart the -
Live migration xen
To do a live migration for a domU, the back-storage of your virtual machine must be shared storage, like iSCSI, AoE, etc... Setting up AoE is explained at ata-over-ethernet and iSCSI at -
Ubuntu
Generates 40 sets of 12 characters of small and large caps alphanum characters and includes punctuation characters: for i in`seq 1 40`; do tr -dc "[:alnum:][:punct:]"/dev/urandom| head -c 12; echo\n -
Main Page
Welcome to The Sysadmin Wiki So easy, your users can use it -
Rman
Rman means recovery manager. It let's you backup your database when it is online, no needs to do a shutdown of the database. If you got any troubles in your database of your hardware -
BSOD
The Blue Screen Of Death (BSOD) is an error screen in Microsoft Windows. The error codes, or STOP codes, are given as hexadecimal numbers, such as 0x0000007b, which is often shortened down to just 0x7b -
BIOS
In IBM PC Compatible computers, the Basic Input/Output System (BIOS), also known as the System BIOS, is a de facto standard defining a firmware interface. The BIOS has different POST codes, which can give -
Clonezilla
Clonezilla can be used to image computers via a liveCD to/from either a usb drive or over the network. Clonezilla has a very simple wizard. Official website -
Migrating Windows
Migrating a windows installation between physical and/or virtual computers can be tricky. Windows machines require a preparation step before the actual cloning. This requirement has been blamed on several factors, like optimization, anti-piracy -
Codec
Different systems include different codecs. Here's some info on what codecs are available on various systems. Default codecs with Windows XP SP2: -
Microsoft Downloads
Exchange 2000 Server Service Pack 3 Exchange Server 2003 Service Pack 2 -
Linux
Topics[] Virtualization with Xen, SAN technology Use cases[] Linux in a microsoft-shop, Linux for grannies -
VNC
This is a remote desktop setup with VNC, where the user only needs to double-click a connect.bat file in order to request a remote desktop connection. It installs a display driver for you -
Software administration
Software administration on a large number of computers can be done in various ways. Programs with.msi installations can be installed unattended, with the following command: msiexec/I"My program.msi"/qb -
TLS
TLS (formerly SSL) is a network protocol for serving web pages like HTTP is, but only encrypted. Installing the Let's Encrypt client: sudo apt install certbot -
Ubiquity/Google search
This page should present you the Ubiquity command, if you have the extension installed and you don't have the command already. The code is saved in a.js file on this wiki. For security -
Cloning
There are various cloning solutions for different purposes. FOG, the Free, Opensource Ghost can image machines remotely, by letting the clients boot a network PXE system, that restores an image onto the client. -
Sample IPv6 Quagga config
The following config is derived from a working config on a OpenWRT Linux router. The original setup has two separate networks: one with a public IPv6 range; the other network based on a unique local -
Thunderbird
Mozilla Thunderbird is a free, open source, cross-platform email and news client developed by the Mozilla Foundation. If you want the ISO standard date format (YYYY-MM-DD), then you can follow the date
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Marvel Database
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With more than 200,000 articles, the Marvel Database is the largest Marvel Comics encyclopedia ever written, as well as being the 5th largest FANDOM wiki. The database covers comics, characters, teams, games, TV shows and movies. Browse one of over…