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IPV4 and IPV6 Subnet Size Reference Table

November 20, 2015 by @HKw@! | No Comments | Filed in Networking

IPV4 SUBNETTING TABLES

Network Bits Subnet Mask Number of Hosts
/1 128.0.0.0 2147483646
/2 192.0.0.0 1073741822
/3 224.0.0.0 536870910
/4 240.0.0.0 268435454
/6 252.0.0.0 67108862
/7 254.0.0.0 33554430
/8 255.0.0.0 16777214
/9 255.128.0.0 8388606
/10 255.192.0.0 4194302
/11 255.224.0.0 2097150
/12 255.240.0.0 1048574
/13 255.248.0.0 524286
/14 255.252.0.0 262142
/15 255.254.0.0 131070
/16 255.255.0.0 65534
/17 255.255.128.0 32766
/18 255.255.192.0 16382
/19 255.255.224.0 8190
/20 255.255.240.0 4094
/21 255.255.248.0 2046
/22 255.255.252.0 1022
/23 255.255.254.0 510
/24 255.255.255.0 254
/25 255.255.255.128 126
/26 255.255.255.192 62
/27 255.255.255.224 30
/28 255.255.255.240 14
/29 255.255.255.248 6
/30 255.255.255.252 2

IPV6 SUBNETTING TABLES Read the rest of this entry »

Apple TV show connect to iTunes with USB Cable

November 12, 2015 by @HKw@! | No Comments | Filed in Apple TV

Today when i turn on my Apple TV, i saw the below nice picture showing on the screen and the status light keep on flashing like crazy.

AppleTV connect iTunes Read the rest of this entry »

NagiosXI – SQL: SQL Error [ndoutils]

October 21, 2015 by @HKw@! | No Comments | Filed in centos, Linux, Nagios, Open Source

Problem Symptoms

Error “SQL: SQL Error [ndoutilsSQL: SQL Error [ndoutils]”

SQL-SQL Error

If you see above error when you logon the NagiosXi Server,  it may be a symptom of one or more crashed tables. The steps outlined below allow you to repair the MySQL database tables used by Nagios XI.

Repairing MySQL Tables

  • First, login to your Nagios XI server as the root user via SSH.
  • Run the Nagios XI database repair script with the following command:

cd /usr/local/nagiosxi/scripts
./repair_databases.sh

This process may take several minutes to complete, depending on the size of your database

If above step unable to solve the problem, you may have to contact Nagios support team

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