Tags » Iptables

Blocking abusive IP addresses using IPTABLES Firewall in Debian/Ubuntu

In one of our previous article we have posted an instructional guide on how to secure your Debian/Ubuntu based VPS using IPTABLES/Netfilter. In the following article we are adding a blacklist to the firewall script which will allow you to Continue reading… 6 more words

Quick subnetting reference

 

CIDR block           Subnet Mask                 IP Quantity   

/32                         255.255.255.255            1   

/31                         255.255.255.254            2   

/30                         255.255.255.252            4   

/29                         255.255.255.248            8   

/28                         255.255.255.240            16   

/27                         255.255.255.224            32   

/26                         255.255.255.192            64   

/25                         255.255.255.128            128   

/24                         255.255.255.0                256   

/23                         255.255.254.0                512   

/22                         255.255.252.0                1024   

/21                         255.255.248.0                2048   

/20                         255.255.240.0                4096   

/19                         255.255.224.0                8192   

/18                         255.255.192.0                16384   

/17                         255.255.128.0                32768   

/16                         255.255.0.0                    65536   

/15                         255.254.0.0                    131072   

/14                         255.252.0.0                    262144   

/13                         255.248.0.0                    524288   

/12                         255.240.0.0                    1048576   

/11                         255.224.0.0                    2097152   

/10                         255.192.0.0                    4194304   

/9                            255.128.0.0                   8388608   

/8                            255.0.0.0                       16777216   

/7                            254.0.0.0                       33554432   

/6                            252.0.0.0                       67108864   

/5                            248.0.0.0                       134217728   

/4                            240.0.0.0                       268435456   

/3                            224.0.0.0                       536870912   

/2                            192.0.0.0                       1073741824   

/1                            128.0.0.0                       2147483648  

Linux

a farm of mules

Why?

Admittedly I’m a file sharer. I like keeping files available to the public that are rare and hard to find. In my opinion file sharing is the only way to prevent some media from vanishing into oblivion (think Star Wars pre-1997 LDs). 2,184 more words

Amule

IPTables: Not for the fainthearted

All our sites run a mixture of defense tools, but IPTables form part of the frontlines! (stop inferring! ;) )

Here are some handy examples for IPTables: 2,030 more words

Linux

Can not connect to Virtualbox Guest Oracle Database 12c Developer Day Database VM due to Oracle Linux firewall

It seems there’s a firewall present on the latest Developer Days Database image which I’ve just downloaded from Oracle.

Description:

I enjoy using these images because it is a complete reference install of Oracle Linux, Oracle Database and Oracle SQL Developer (among others). 256 more words

SQL

Настройка IPtables для web сервера на RedHat/CentOS/Fedora

Настройка IPtables для web сервера на RedHat/CentOS/Fedora
Безопасность превыше всего, нужно это знать и понимать как это сделать! Я хотел бы рассказать как можно настроить iptables для web сервером которые работают на CentOS, RedHat или Fedora. В идеале нужно все порты заблокировать и оставить (…

Blocking Hosts with Bad Behaviour via iptables & ipset

I recently made a small Rails based private content sharing application for a few friends and I to use. The idea is that we can share cool things without resorting to email or instant messengers, which invariably make things very hard to find when you’re searching in future. 542 more words

Web