IPTables

How to Open Port 1521 on Linux Server

by Ed Chen
June 22, 2023July 18, 2023

Firewall on Linux A firewall monitors and controls incoming and outgoing network traffic based on preconfigured security rules. It's not necessarily an appliance, it could… Read More »

How to Resolve ORA-12535: TNS:operation timed out

by Ed Chen
February 11, 2019June 23, 2023

ORA-12535 and TNS-12535 ORA-12535 is the same as TNS-12535, they all indicate that the connection between the client and the listener has been timed out.… Read More »

How to Build 12c RAC (3/6) - Preparing for Installations of Grid and RAC

by Ed Chen
September 21, 2015June 22, 2023
4 Comments

How to Build 12c RAC (2/6) - Building Two Servers for RAC Before we can actually install grid infrastructure and RAC database, there's a long… Read More »

How to Open Port Permanently on Linux

by Ed Chen
August 19, 2014June 23, 2023

Open Port There're differences to open port between Enterprise Linux (EL) 6 and 7, although they are IPTABLES operating underneath. EL6 uses iptables to manage… Read More »

How to Block Blacklist in IPTables

by Ed Chen
June 25, 2014November 22, 2022

How to Maintain Blacklist for IPTables AutomaticallyIn general, we seldom block each of a bunch of IP addresses one by one with bare hands in… Read More »

How to Maintain Blacklist for IPTables Atomatically

by Ed Chen
June 24, 2014December 11, 2022

Several sources provide IP blacklist free to download, you can leverage the blacklist to plan the blocking policies for your own firewall. http://myip.ms/files/blacklist/csf/latest_blacklist.txt http://infiltrated.net/blacklisted Assuming… Read More »

How to Persist Manually Modified Iptables Across System Reboots

by Ed Chen
April 19, 2014March 27, 2018

After modifying the iptables manually, restarting the service to make it work.[root@test ~]# vi /etc/sysconfig/iptables[root@test ~]# service iptables restartiptables: Setting chains to policy ACCEPT: filter… Read More »

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