It is important to note that TCP flow control mechanism as well as Ethernet flow control mechanism are completely 2 different mechanism, which strive to achieve the same unique goal but when in used, are completely unaware of each other.
As a matter of fact, Ethernet flow control can fully alienate your network if not planned [...]
September 16, 2009 - 11:39 am
Tags: bandwidth, mss, mtu, tcp
Posted in Networking, TCP/IP | No comments
As simple as possible laid off, the Mathis equation goes as follow
Rate <= (MSS/RTT)*(1 / p)
MSS
This is the Maximum Segment Size, which is the MTU excluding the TCP/IP headers.
MSS = MTU – TCP/IP headers – for example 1460 with an MTU of 1500 (20b IP and 20b TCP headers)
RTT
RTT is the Round Trip Time as [...]
There has been a lot of buzz lately on security layer when it comes to running services/open ports and how to step away from the security risk line, at least with just one step.
Port Knocking can be summarized in three steps
1. My service’s port is locked by default
2. My service’s port will not open unless [...]
November 5, 2008 - 5:10 pm
Tags: C, scripts, Security, shell
Posted in C, Programming, Unix / Linux | No comments
One of the most annoying matter I have met when administrating a server was following and fixing messes other users (who happen to have root password) would do on the server.
Random users with root passwords often know two things… “sh” and “history -c”… and of course “I didn’t do it”.
Now, while it is important to [...]
October 8, 2008 - 5:04 pm
Tags: ddos, iptables, netstat, Security
Posted in Unix / Linux | No comments
A friend of mine asked me what he should do when experiencing a DDOS attack.
Well the excerpt itself would be long as on how to handle a DDOS attack, as each type of Denial of Service needs different handles… as experienced is a sys-admin, as throughout he/she would be able to handle the attack.
However, for [...]
October 8, 2008 - 5:24 am
Tags: linux, News, Ramblings
Posted in General | No comments
If you are interested in Linux, you certainly would be interested in Linus, its creator.
Linus still works as one of the kernel mainternair (yes! you got it! Linux isn’t RedHat, Debian but only the kernel).. anyway, to get more update on the geek’s life, follow this link http://torvalds-family.blogspot.com/
have fun reading,