[:–:]cat /proc/sys/net/ipv4/tcp_reordering 3 [:–:] The tcp_reordering variable tells the kernel how much a TCP packet may be reordered in a stream without assuming that the packet was lost somewhere on the way. If the packet is assumed lost, the TCP stack will automatically go back into a slow start since it believes packets may have …
Monthly Archives: April 2010
frame definitions
frame —| 1. a border or case for enclosing a picture, mirror, etc. 2. A {data link layer} “packet” which contains the header and trailer information required by the physical medium
tcp tuning tcp_abc
echo 1 > /proc/sys/net/ipv4/tcp_abc From RFC 3465. A Modified Algorithm for Increasing the Congestion Window As originally outlined in [Jac88] and specified in [RFC2581], TCP uses two algorithms for increasing the congestion window. During steady-state, TCP uses the Congestion Avoidance algorithm to linearly increase the value of cwnd. At the beginning of a transfer, after …
Basic relativity principles
Certain principles of relativity have been widely assumed in most scientific disciplines. One of the most widespread is the belief that any law of nature should be the same at all times; and scientific investigations generally assume that laws of nature are the same regardless of the person measuring them. These sorts of principles have …
mechanics :|
Mechanics is the branch of physics concerned with the behaviour of physical bodies when subjected to forces or displacements, and the subsequent effect of the bodies on their environment.
mechanics :|
Mechanics is the branch of physics concerned with the behaviour of physical bodies when subjected to forces or displacements, and the subsequent effect of the bodies on their environment.
FAI. Fully Automatic Installation.
FAI Installation Steps Network boot via PXE Run scripts to determine FAI classes and variables Partition local hard disks and create RAID, LVM configuration and the file systems Install and configure software packages Customize OS and software to your local needs Reboot freshly installed machine http://www.informatik.uni-koeln.de/fai/features/
tcp tuning tcp_syncookies
tcp_syncookies. Send out syncookies when the syn backlog queue of a socket overflows. This is to prevent against the common “syn flood attack”. Disabled (0) by default. :–:cat /proc/sys/net/ipv4/tcp_syncookies 0 :–: added from linux kernel source. /* 160 * Generate a syncookie. mssp points to the mss, which is returned 161 * rounded down to …
What does rfc 1337 say ?
From RFC 1337. TIME-WAIT state removes the hazard of old duplicates for “fast” or “long” connections, in which clock-driven ISN selection is unable to prevent overlap of the old and new sequence spaces. The TIME-WAIT delay allows all old duplicate segments time enough to die in the Internet before the connection is reopened. echo 1 …
tcp tuning tcp_rfc1337
From RFC 1337. TIME-WAIT state removes the hazard of old duplicates for “fast” or “long” connections, in which clock-driven ISN selection is unable to prevent overlap of the old and new sequence spaces. The TIME-WAIT delay allows all old duplicate segments time enough to die in the Internet before the connection is reopened. echo 1 …