Free and Open Source blogger with an attitude
Here’s an nmap snippet for scanning for hidden cctv / ip camera in the network
nmap -sV --script=http-enum,http-title,rtsp-url-brute -p 80,443,554,8000 <ip range>
Or you can write as :
sudo nmap -sV --script=http-enum,http-title,rtsp-url-brute -p 80,443,554,8000 192.168.0.0/24
Make sure you have permission to scan on the network!
After long and careful consideration, I decided to enable CloudFlare for my blog.
CloudFlare is a content delivery network which aims to enhance website security and performance. CloudFlare CDN offers protection againts many forms of malicious activity including: spammers, email harvesters, SQL Injection, XSS, denial-of-service attack and suspicious web requests. Therefore saving valueable bandwidth from the web hosting machine.
My Personal Experience with CloudFlare
After a while using CloudFlare, I’ve notice that:
So far, so good, I love using CloudFlare…
rsnapshot is a utility that uses rsync to synchronize files between two directories. rsnapshot makes it easier for system admin to backup crucial system data files regularly with minimal bandwidth and effort.
This guide assumes that you’ve already installed nfs-client and rsnapshot via “apt-get” utility in your Debian/Ubuntu Linux system.
Assumptions:
The backup server is connected in the same LAN as the main computer. The backup server is mounted as NFS on the main computer, ip address of the backup server is 192.168.1.100.
Step 1: Create a script to mount backup server filesystem
This is to ensure that the backup server is available at least hourly (or daily, depending on your requirements), save the file as “mount-backup-server.sh”
File content:
#!/usr/bin/bash # mount-backup-server.sh mount 192.168.1.100:/backup-point/ /media/backup/
Step 2: Ensure the mount script is run hourly
sudo cp mount-backup-server.sh /etc/cron.hourly sudo chmod a+x /etc/cron.hourly/mount-backup-server.sh
Continue reading “How to back up files periodically using rsnapshot and NFS in Ubuntu Linux”
MySQL service port are not meant to be accessible to the outside world as it would become a security concern to the administrator.
Although MySQL server (mysqld) by itself has a built-in mechanism to deny access from unauthorized ip-address, it still does not protect it from being overwhelmed by multiple malicious requests or buffer overflow attack directed to the server.
One of the solution is to limit the MySQL port access to trusted network using iptables
This assume your trusted network has the address within the range of 192.168.1.1-192.168.1.254
iptables -A INPUT -i eth0 -p tcp -s 192.168.1.0/24 --dport 3306 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -o eth0 -p tcp --sport 3306 -m state --state ESTABLISHED -j ACCEPT
MySQL server (mysqld) uses port 3306.
Note: Always assume the internet as the untrusted network!
Ever find yourself in need to share file over the network quickly, but find yourself lacking time to setup a proper NFS or samba share? Here’s a way to do this with the good old Python CLI.
You may find this technique offers limited options to share files, but its a real time saver!
Supported chipset for b43 Broadcom Linux drivers are :
and unsupported are:
Please refer to this post, Ubuntu Hardy Heron : Wifi Broadcom Support with b43 driver for a guide to activate B43 Linux driver in order to use wifi function in your laptop.