NMAP Security Scanner on Linux Rumi, August 21, 2015February 11, 2017 First of all, you should get the “nmap” package installed in your system. On CentOS yum install nmap On Debian apt-get install nmap On Ubuntu sudo apt-get install nmap NMAP Commands: sudo nmap -sS [IP address] or [website address] sudo nmap -O –osscan-guess [IP address] or [website address] sudo nmap… Continue Reading
PEN: HTTP Load Balancer Rumi, August 15, 2015August 15, 2015 This is performed on a CentOS 6.x 64 bit machine Install pen which is lightweight simple Load Balancing software. It is TCP protocol based, so it’s possible to balance not only HTTP but SMTP, FTP, LDAP and so on. This example is based on the environment like follows. Configure Pen… Continue Reading
perl(Net::SSLeay) is needed by webmin Rumi, July 16, 2015 So the Webmin on Redhat/CentOS is now requiring this particular perl module to be pre-installed before the RPM installer begins. A very short cut to install this module by using yum- yum install -y perl-Net-SSLeay Voila! your done. Continue Reading
Zimbra Domain Administration (Multi-tenant) Rumi, June 4, 2015 In order to create a multi tenancy in zimbra OSA, can be acheived through a bash script below. Thanks to Ahmad Imanuddin (http://www.imanudin.com) for sharing this very useful script. cd /srv/ vi admin-delegate.sh Fill with the following line : Continue Reading
Zimbra Increasing Attachment Size works for 8.5 Rumi, June 4, 2015 Through zimbraGUI didn’t find it how to do it, but through console it appeared to be working with the following set of commands to modify postfix actually- su zimbra zmprov mcf zimbraMtaMaxMessageSize 20971520 zmprov mcf zimbraFileUploadMaxSize 20971520 zmprov mcf zimbraMailContentMaxSize 52428800 zmprov modifyConfig zimbraMtaMaxMessageSize 52428800 postfix reload Once theyre executed,… Continue Reading
Two Default Gateways on One System Rumi, May 21, 2015 Problem Description You have built two or more network cards into one Linux system and each of these cards has its own default gateway. By default, you can only have one default gateway on a system. The case described would lead to asynchronous routing, whereby the router would reject the… Continue Reading
2 Gateways or Multiple Gateway on a single CentOS box Rumi, May 21, 2015 Scenerio- eth0- 172.30.0.100 | Gateway- 172.30.0.97 eth1- 192.168.2.247 | Gateway- 192.168.2.1 Need to connect to SIP BOX destination (fictitious)- 202.140.1.1 eth0 has not internet access but it uses the mentioned (172.30.0.97) as gateway to reach 202.140.1.1 server eth0 has internet access by using 192.168.2.1 gateway. Here goes the configuration on /etc/sysconfig/network-scripts/ifcfg-eth0 Continue Reading
Cacti on Debian (Updated) Rumi, April 19, 2015April 19, 2015 Downloading Cacti You can download the newest version of Cacti from its website. wget http://www.cacti.net/downloads/cacti-0.8.7b.tar.gz Installing Cacti Install apache webserver with php support, mysql database server, snmp, some php modules and rrdtool. apt-get install apache2 libapache2-mod-php5 php5 php5-cli php5-mysql php5-gd php5-snmp mysql-client mysql-server libmysqlclient15-dev snmp snmpd rrdtool Add a user… Continue Reading
Enable 1:1 NAT in Iptables Rumi, April 17, 2015 1:1 NAT maps a single Public IP Address to one of your computer within your local area network (LAN). Unlike port forwarding, 1:1 NAT forwards all ports from one external IP to one internal IP. iptables -t nat -A POSTROUTING -o eth0 -s 192.168.1.2 -j SNAT –to-source 83.229.64.2 iptables -t… Continue Reading
How to enable Port Forwarding in Iptables Rumi, April 17, 2015 Port forwarding allows remote computers, for example, computers on the Internet, to connect to a specific computer or service within a private local area network (LAN). Typical applications include the following: Running a public HTTP server within a private LAN Permitting Secure Shell access to a host on the private… Continue Reading