Own Notes – Iptables

24 March 2017 Leave a comment

Allow Incoming SSH only from a Specific Network

    The following rules allow incoming ssh connections only from network

    root@home# iptables -A INPUT -i eth0 -p tcp -s --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT
    root@home# iptables -A OUTPUT -o eth0 -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT

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Create Solaris 10×86 USB bootdisk installer

28 July 2016 Leave a comment


USB disk (min size 4GB)

PC / laptop with solaris 10 x86 installed

Solaris installer iso image (tested with Solaris 10 x86 update 8/9/10/11)


Installation time will be much faster compare to install from DVDROM Read more…

Create network boot for concurrent RHEL6.5 installation

29 January 2015 Leave a comment


  1. Installed RHEL6.5
  2. RHEL6.5 x86_64 DVD installer
  3. Services : dhcp, NFS, tftp
  4. Familiar with vi text editor (or nano, etc)


  1. Installation can be done concurrently without DVD
  2. Time and Money saving

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RedHat Linux network redundancy using interface bonding

11 May 2014 1 comment

This notes written down when facing requirement to make barco wall-display working with redundant network link. Eventhough setup barco controller is not part of my responsibility, I still want to help our customer to fulfill their needs – for the sake of knowledge sharing.


This configuration tested using hardware and software specification

  1. Linux distribution RH7.2 (Enigma) i386
  2. network interfaces (identified as eth0 & eth1)

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Own Notes – FreeBSD

26 April 2014 2 comments

This is my own notes, work faster & reduce time for googling 😀 Read more…

Categories: FreeBSD

Solaris 10 Sys Admin Notes

26 April 2014 Leave a comment

This is my own notes, work faster & reduce time for googling 😀
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Categories: Uncategorized

Clear Digi_PortServer_TS16’s buffer using Scheduler on Solaris 10

24 September 2012 Leave a comment


Description : Digi PortServer TS16 always hang after operating for hours, and need to hot-restarted.
Analysis of Problem : We assume device hang because of buffer over flow.
Solution : Create script with specific function (login to the device, clear all buffer, logout) and execute automagicaly with cron scheduler.

Figure 1. Digi PortServer TS16 connect to Solaris box via UTP Cable

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