The Netfilter in the Linux kernel is able to keep track of network packet’s state and context. This means that Netfilter can distinguish packets associated with an established connection from packets that are not. For example, if you connect to a web server with your browser, the web server answers …
Default umask The umask (user file-creation mode mask) command is a shell built-in command which determines the default file permissions for newly created files. This can be overwritten by system calls but many programs and utilities make use of umask. By default, Red Hat sets umask to 022 or 002 which is fine. If the name …
One of the most important tasks for System Administrator/Engineer is to detect and close network ports that are not needed. To get a list of listening network ports (TCP and UDP sockets), you can run the following command: # netstat -tulp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address …
Cacti Manuals Contains basic information such as installing and using Cacti as well advanced features such as Data Queries and 95th percentile. 0.8.7 Manual 0.8.8 Manual 0.8.7 PDF – Coming soon! Development Standards Formatting Guidlines File System Layout Patch Creation PHP Specific Constructs Security SQL Standards Subversion From a fresh …
The new bind version 9.3.6 (Redhat 5.4) try to use IPv6 transport even if the server host does not have IPv6 connectivity, resulting in slower name resolution. Sep 2 19:43:16 cpanel named[22767]: network unreachable resolving ‘ns.isc.afilias-nst.info/A/IN’: 2001:500:7::79#53 To fix this you have to start the bind damon with “-4″ (IPv4 …
What is the best wireless card to buy ? Which card to purchase is a hard question to answer. Each person’s criteria is somewhat different, such as one may require 802.11n capability, or may require it to work via virtualisation. However, having said that, if money is not a constraint …
My news stories on Infosecurity Magazine from Monday 02 April until Thursday 05 April… Anonymous UK plans to attack the Home Office The UK faction of Anonymous has announced a campaign against the Home Office in protest against extradition arrangements with the US, and the European Arrest Warrant (EAW). It …
No, no, a thousand times no. A private organization, in this case Sky News, must never be allowed to justify breaking the law for any reason whatsoever. The case in point involved hacking private emails. Yesterday, John Ryley, head of Sky News, reiterated: To be absolutely clear, we stand by …
I’m not on the GCHQ press mailing list, so I missed this earlier this week. But, better late than never, so let’s make up for it. GCHQ has announced the first eight recipients of its ‘Academic Centre of Excellence in Cyber Security Research’ status. They are: University of Bristol Imperial …
OK, nudge, nudge, wink, wink – I’ve got two free videos for you to watch. The first is available via TVShack.net, the site owned (long ago) by Richard O’Dwyer and now pwned by the ICEmen. Go there. You’ll find the ICEmen’s takedown notice. But hang around for a minute (well, …