A little bit of wisdom
AS number. AS = Autonomous System Number From Wikipedia Border Gateway Protocol (BGP) is a standardized exterior gateway protocol designed to exchange routing and reachability information between autonomous systems (AS) on the Internet.[1] The protocol is often classified as a path vector protocol, but is sometimes also classed as a distance-vector routing protocol. The Border […]
Private Address Range (ipv4) 10.0.0.0 – 10.255.255.255 (10/8 prefix) 172.16.0.0 – 172.31.255.255 (172.16/12 prefix) (/12=255.240.0.0) 192.168.0.0 – 192.168.255.255 (192.168/16 prefix)
Network Revision – TCP/IP etc. This module is (mostly) taken by two types of people – those who have done a networking course and those who will soon. (There is also sometimes a minority who haven’t and won’t – don’t worry if this is you.) Those of you familiar with networking to some extent will […]
Network / USB / SCSI – speeds. If like me you’ve started to get a little lost in all the various network, cabling and WiFi options you might be interested in this short comparison of the various cable types. Cable Type – Speed USB 1: 1.5 Mb/s – 12 Mbs USB 2: 480 Mb/s Firewire […]
100Base-T Cabling Guidelines This section describes 100Base-T cabling guidelines and some common configurations for Catalyst 2800 modules. The following cabling guidelines apply to a 100Base-T network: The maximum length for an Unshielded Twisted Pair (UTP) cable segment is 100 meters. Any cable segment longer than 100 meters must be fiber. A 100Base-T repeater is equivalent […]
ICMP Types # # ICMP types # icmpType0=echo-reply icmpType3=destination-unreachable icmpType5=redirect icmpType8=echo-request icmpType11=time-exceeded #
Download and install the win32 distribution of OpenSSL from Shining Light Productions here Follow the installation instructions and install OpenSSL accepting the defaults. The default installation path is C:\OpenSSL Add C:\OpenSSL\bin to your system path (Control Panel, System, Advanced, Environment Variables, System Variables) By default, the installation references C:\OpenSSL\bin\openssl.cnf via an environment variable created during […]
Finding files and directories in Linux – alternate method Find empty directories in the current directory using find -empty find . -type d -empty Use the following command to remove all empty directories under the current directory. find . -type d -empty -exec rmdir {} \; Note: It is not recommended to remove empty directories […]
[Sed] Delete one or more lines from a file Here is how to remove one or more lines from a file. Syntax: sed ‘{[/]||[/]}d’ sed ‘{[/][,][/]d’ /…/=delimiters n = line number string = string found in in line regex = regular expression corresponding to the searched pattern addr = address of a line (number or […]
Finding files and directories in Linux. Case-insensitive file searching with the locate command It’s easy to perform a case-insensitive file search with the Linux locate command: just add the -i flag. To search my entire filesystem for files and directories that contain the string typeahead, just use this command: locate -i typeahead Case-insensitive file searching […]
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