Category Archives: Smoothwall

Shellshock (bash vulnerability/bash bug)(Deadly serious’ new vulnerability found)(All OS X and Linux systems wide open)

A new vulnerability has been found that potentially affects most versions of the Linux and Unix operating systems, in addition to Mac OS X (which is based around Unix). Known as the “Bash Bug” or “ShellShock,” the GNU Bash Remote Code Execution Vulnerability (CVE-2014-6271) could allow an attacker to gain control over a targeted computerContinue reading “Shellshock (bash vulnerability/bash bug)(Deadly serious’ new vulnerability found)(All OS X and Linux systems wide open)”

Recommended size in percentage for each partition (Ubuntu / Linux)

I have seen most of dedicated hosting companies servers always have multiple partition for various folders. I have tried to follow some guide lines on my own on virtual box. I always use swap space as double the ram. let’s say TS = total Size SS = Swap Size MS = Main Size MS =Continue reading “Recommended size in percentage for each partition (Ubuntu / Linux)”

iperf (tool to measure the bandwidth and the quality of a network link)

Iperf is a tool to measure the bandwidth and the quality of a network link. The network link is delimited by two hosts running Iperf. The quality of a link can be tested as follows: – Latency (response time or RTT): can be measured with the Ping command. – Jitter (latency variation): can be measured with an IperfContinue reading “iperf (tool to measure the bandwidth and the quality of a network link)”

5 commands to check memory usage on Linux

1. free command The free command is the most simple and easy to use command to check memory usage on linux. Here is a quick example $ free -m total used free shared buffers cached Mem: 7976 6459 1517 0 865 2248 -/+ buffers/cache: 3344 4631 Swap: 1951 0 1951 The m option displays allContinue reading “5 commands to check memory usage on Linux”

Reverse Proxy (Reverse Proxy vs Forward Proxy)

  In computer networks, a reverse proxy is a type of proxy server that retrieves resources on behalf of a client from one or moreservers. These resources are then returned to the client as though they originated from the server itself (or servers themselves).While a forward proxy acts as an intermediary for its (usually nearby) associated clients and returns to them resources accessible onContinue reading “Reverse Proxy (Reverse Proxy vs Forward Proxy)”

Port Forwarding

::::Port forwarding:::: http://portforward.com/ Port forwarding or port mapping is a name given to the combined technique of 1.translating the address or port number of a packet to a new destination 2.possibly accepting such packet(s) in a packet filter (firewall) 3.forwarding the packet according to the routing table. The destination may be a predetermined network portContinue reading “Port Forwarding”

Smoothwall Proxy settings, applications and mobile devices

:::Proxy::: (client sends the request to the web proxy. web proxy retrieves the page on the client’s behalf and the sends it back to the client) (proxies are used to handle web traffic, but other services can also be handled e.g. DNS proxy) (Squid web proxy is used on the smoothwall as a proxy engine)(butContinue reading “Smoothwall Proxy settings, applications and mobile devices”