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Unix Admin

How to persist iptables settings on debian

Posted on February 19, 2019 by Vishal Jain

Use iptables-persistent instead of old way of iptables-save and iptables-restore to automate saving and restoring during reboots. Just remember to still perform...

Debugging Tools/Internet/Network Tools/Unix Admin

Net-SNMP configuration for non-root AgentX application

Posted on January 9, 2017 by Vishal Jain

By using a TCP Socket one can allow a non-root AgentX application/agent to connect to Net-SNMP masteragent. But this should be used for development purpose only...

c c++/Unix Admin

DST does not influence UnixTime or Seconds since Epoch

Posted on August 24, 2016 by Vishal Jain

Seconds since Epoc or Unixtime is ever increasing value and it remains stable (except for leap second). Daylight Savings changes does not affect it.

Network Tools/Unix Admin

Capture local network traffic for multi-homed host

Posted on August 21, 2016 by Vishal Jain

If both end-points of a socket are on local system, network traffic will be seen on loopback interface even if applications are using non-loopback interface (e....

Internet/Unix Admin

mimikatz : Export non-exporteable Private certificate from Symantec PKI

Posted on August 10, 2014 by Vishal Jain

Using mimikatz on windows user can export certificates that were setup using Symatec PKI Client and were marked non-exportable.

Bash/Shell Scripts/Unix Admin

postfix : Configure outgoing relay server

Posted on March 31, 2014 by Vishal Jain

Add name of outgoing/relaying mailhost as `relayhost` in `/etc/postfix/main.cf` and restart postfix.

Bash/Shell Scripts/Unix Admin

Find the process monopolizing the CPU without using “top”

Posted on March 24, 2014 by Vishal Jain

`ps -eo pcpu,pid,ruser,args | sort -r -k1 | less` provides in reverse sort order the `pid` that is taking up most of `pcpu` and the `ruser` (real user) with `ar...

Unix Admin

Setup WebEx on 64 bit Ubuntu 12.04 using 32 bit Oracle Java

Posted on March 24, 2013 by Vishal Jain

WebEx needs 32 bit Oracle Java to run which can be installed locally along with Firefox.

Unix Admin

Add a custom script in Unity HUD

Posted on March 2, 2013 by Vishal Jain

Create `/usr/share/applications/.desktop` file and run `update-desktop-database` to add the custom script in Unity HUD.

Internet/Network Tools/Unix Admin

vpn : Split Tunnel Concept

Posted on July 4, 2012 by Vishal Jain

Split tunnel allows user to access local network resources and divert Internet traffic away from tunnel while still remain connected to company vpn. Specific ne...

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