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| | Transmission Control Protocol - Wikipedia, the free encyclopedia |
 | | TCP window scale, as defined in RFC 1323, is an option used to increase the maximum window size from 65,535 bytes to 1 Gigabyte. | | | The TCP checks that no bytes are damaged by using a checksum; one is computed at the sender for each block of data before it is sent, and checked at the receiver. | | | TCP does the task of the transport layer in the simplified OSI model of computer networks. |
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http://en.wikipedia.org/wiki/Transmission_Control_Protocol
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| | Transmission Control Protocol - Wikipedia, the free encyclopedia |
| | TCP window scale, as defined in RFC 1323, is an option used to increase the maximum window size from 65,535 bytes to 1 Gigabyte. | | | The TCP checks that no bytes are damaged by using a checksum; one is computed at the sender for each block of data before it is sent, and checked at the receiver. | | | TCP does the task of the transport layer in the simplified OSI model of computer networks. |
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http://en.wikipedia.org/wiki/Transmission_Control_Protocol
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| | 88609.031023&ELEMENT_SET=DECL |
| | Fast retransmit and fast recovery algorithms are known TCP congestion control methods. | | | One of the objective of the present invention is to provide a method for triggering the fast retransmit and fast recovery mechanism as fast as possible, by means of which the throughput of TCP connection and the utilization of the network resoure can be improved. | | | When TCP is used as the transport protocol, some types of delay and packet loss that are unrelated to congestion will be encountered during mobile node handing over between two subnets. |
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http://www.wipo.int/cgi-pct/guest/getbykey5?KEY=03/88609.031023&ELEMENT_SET=DECL
(3981 words)
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| | Transmission Control Protocol - Wikipedia, the free encyclopedia |
| | TCP window scale, as defined in RFC 1323, is an option used to increase the maximum window size from 65,535 bytes to 1 Gigabyte. | | | The TCP checks that no bytes are damaged by using a checksum; one is computed at the sender for each block of data before it is sent, and checked at the receiver. | | | TCP does the task of the transport layer in the simplified OSI model of computer networks. |
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http://en.wikipedia.org/wiki/Transmission_Control_Protocol
(2666 words)
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| | Introduction to TCP/IP |
| | TCP was designed to recover from node or line failures where the network propagates routing table changes to all router nodes. | | | Introduction to TCP/IP Summary: TCP and IP were developed by a Department of Defense (DOD) research project to connect a number different networks designed by different vendors into a network of networks (the "Internet"). | | | TCP adds support to detect errors or lost data and to trigger retransmission until the data is correctly and completely received. |
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http://www.yale.edu/pclt/COMM/TCPIP.HTM
(2666 words)
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| | wrappers.html |
| | Each of these files describes the tracking of a computer cracker and the development of the TCP Wrappers software program. | | | Related documents to the creation of the TCP Wrappers system can be found at ftp.win.tue.nl/pub/security/tcp_wrapper.txt.Z and research.att.com:/dist/internet_security/berferd.ps. | | | The TCP Wrappers are designed to intercept requests for communication with the networks inetd daemon. |
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http://www.cs.umbc.edu/~woodcock/cmsc482/proj1/wrappers.html
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| | Xinetd and TCP Wrappers: lightweight firewalls for inetd |
| | Xinetd and TCP Wrappers: lightweight firewalls for inetd | | | Version 7.6 of the TCP wrappers software is available from ftp://ftp.porcupine.org/pub/security/ and works with existing inetd. | | | A good account of the thinking that led to the creation of the TCP wrappers is the paper "TCP Wrapper: Network Monitoring, Access Control, and Booby Traps," which is available from the same FTP site as the TCP wrappers software. |
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http://www.softpanorama.org/Net/Firewalls/xinetd_and_tcp_wrappers.shtml
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| | TCP Wrappers and xinetd |
| | TCP wrappers operate in a manner that is separate from the applications the wrapper program protects. | | | The connecting client is unaware that TCP wrappers are in use. | | | TCP wrappers is installed by default with a server-class installation of Red Hat Linux, providing many advantages over running a variety of different services, each with their own access control methods. |
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http://www.redhat.com/docs/manuals/linux/RHL-7.3-Manual/ref-guide/ch-tcpwrappers.html
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| | RFC 1180 (rfc1180) |
| | Instead the IP packet is discarded and the recovery from the IP packet loss is left to the TCP module or the UDP network application. | | | For the computer in table 1, with an IP address of 223.1.2.1, the network number is 223.1.2 and the host number is number 1. | | | From this example you can see that alpha is computer number 1 on the development network, beta is computer number 2 on the development network and so on. |
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http://www.cse.ohio-state.edu/cgi-bin/rfc/rfc1180.html
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| | Understanding TCP/IP addressing and subnetting basics |
| | TCP/IP network problems are often caused by incorrect configuration of the three main entries in a computer's TCP/IP properties. | | | When you configure the TCP/IP protocol on a Microsoft Windows computer, an IP address, subnet mask, and usually a default gateway are required in the TCP/IP configuration settings. | | | For a TCP/IP wide area network (WAN) to work efficiently as a collection of networks, the routers that pass packets of data between networks do not know the exact location of a host for which a packet of information is destined. |
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http://support.microsoft.com/support/kb/articles/q164/0/15.asp
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| | LINK.bnl - In the Public Domain - October 1994 |
| | Once TCP Wrapper is "sqirted" to your system, it must be copied not linked by the way, follow the instructions in the file /usr/local/info/tcpwrapper-6.3/README-BNL to complete the installation. | | | Installing TCP wrapper on your UNIX host is easy should be one of the first steps taken to secure a UNIX workstation. | | | Using TCP Wrapper does not impact legitimate computer users or impose a great maintenance burden a system administrator. |
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http://www.ccd.bnl.gov/pdsdir/pds/9410-tcp-wrapper.html
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| | TCP Stack Measurements on Lighly Loaded Testbeds |
| | To ensure that the throughput was not limiuted by TCP or lower levels, we also measured TCP throughput with iperf with a 32MByte requested window, a txqueuelen of 100, and an MTU of 9000Bytes. | | | For the stock TCP stack the difference in CPU utilization/Mbits/s between MTU=1500Bytes and 9000Bytes was fairly small (see 2nd figure below) and was close to that for the FAST stack for a 9000Byte MTU. | | | FAST TCP is based on Vegas and uses the RTT to indicate congestion. |
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http://www-iepm.slac.stanford.edu/monitoring/bulk/fast
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| | New Scientist Breaking News - Packet tracking promises ultrafast internet |
| | The Fast TCP software uses this to predict the highest data rate the connection can support without losing data. | | | TCP breaks down large files into small packets of about 1500 bytes, each carrying the address of the sender and the recipient. | | | Since the packets are the same size as those used in TCP, none of the equipment along the internet itself will have to be modified, and no new hardware will be needed on computers receiving the data. |
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http://www.newscientist.com/article.ns?id=dn3799
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| | TCP Wrapper Features |
| | A value of "extended" will cause the TCP Wrappers daemon to log the ACLs information like: the entry with which the client request is matched and its related options. | | | The following are the binaries distributed with this release of TCP Wrappers: | | | TCP Wrappers suite also provides tools tcpdchk and tcpdmatch to validate the inetd.conf, hosts.allow and hosts.deny entries in the configuration file and to predict how tcpd would handle a specific service request respectively. |
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http://docs.hp.com/en/5969-4315/ch01s01.html
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| | TCP Wrapper Integration |
| | First off you're going to have to define a service in your object configuration file for the TCP wrapper alerts. | | | the host you are using TCP wrappers on) is not the same host on which Nagios is running. | | | Also, I am assuming that you having installed the nsca daemon on your monitoring server and the nsca client (send_nsca) on the machine that you are generating TCP wrapper alerts from. |
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http://nagios.sourceforge.net/docs/1_0/int-tcpwrappers.html
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| | RFC 793 (rfc793) - Transmission Control Protocol |
| | TCP is designed to work in a very general environment of interconnected networks. | | | Padding: variable The TCP header padding is used to ensure that the TCP header ends and data begins on a 32 bit boundary. | | | The suggestion here is that the TCP implementations need to actively attempt to combine small window allocations into larger windows, since the mechanisms for managing the window tend to lead to many small windows in the simplest minded implementations. |
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http://www.faqs.org/rfcs/rfc793.html
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| | CERT Advisory CA-1999-01 Trojan horse version of TCP Wrappers |
| | Wietse Venema expresses his gratitude to his former employer, Eindhoven University, for making possible the development and distribution of the TCP Wrapper software, and appreciates the support from system administrators of the department of mathematics and computing science. | | | We encourage sites who downloaded a copy of the TCP Wrapper after Thursday, January 21, 1999 at 06:16:00 GMT to verify the authenticity of their TCP Wrapper distribution, regardless of where it was obtained. | | | As a workaround, until you are able to verify your copies of TCP Wrappers, you can block inbound connections with a source port of 421 at your network perimeter. |
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http://www.cert.org/advisories/CA-1999-01.html
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| | SSF TCP Regression Tests |
| | TCP Reno: Fast recovery with two packet drops and delayed-ack, comparing the trace with and without maximum congestion window limit. | | | Because NS TCP implementation has changed since 1997, some trace plots shown in the 1997 documents included with the ns-2 release are different from the trace plots obtained today by running the ns-2 simulator using the same parameter settings. | | | TCP never sends more data in a burst than the minimum of the receive window and the congestion window. |
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http://www.ssfnet.org/Exchange/tcp/tcpTestPage.html
(817 words)
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| | README.tcpwrappers |
| | The daemon wrappers implement a common subset of the protocols. | | | File protections: the wrapper, all files used by the wrapper, and all directories in the path leading to those files, should be accessible but not writable for unprivileged users (mode 755 or mode 555). | | | There are two ways to use the wrapper programs: 1) The easy way: move network daemons to some other directory and fill the resulting holes with copies of the wrapper programs. |
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http://www.sunfreeware.com/README.tcpwrappers
(7017 words)
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| | rfc3782.txt |
| | In this case, the TCP data sender is unable to distinguish between a duplicate acknowledgement that results from a lost or delayed data packet, and a duplicate acknowledgement that results from the sender's unnecessary retransmission of a data packet that had already been received at the TCP data receiver. | | | The Fast Retransmit and Fast Recovery Algorithms in NewReno The standard implementation of the Fast Retransmit and Fast Recovery algorithms is given in [RFC2581]. | | | We call this modified Fast Recovery algorithm NewReno, because it is a slight but significant variation of the basic Reno algorithm in RFC 2581. |
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http://www.ietf.org/rfc/rfc3782.txt
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| | Instructions for Configuring inetd.conf and syslog.conf for tcpd |
| | On each TCP based entry in inetd.conf, you insert the wrapper as the daemon which inetd will invoke, and pass to the wrapper the name of the actual daemon and any options which you would pass to it. | | | Modify the /etc/inetd.conf and /etc/syslog.conf files to activate the use of tcpd (tcp wrapper) and log its activity. | | | For any TCP based connection, tcpd can be used to examine the incoming connection's address and decide whether to accept or reject it based on the hosts.allow and hosts.deny files. |
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http://www.itc.virginia.edu/unixsys/sec/wrapper.html
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| | Securing Your Host -- Additional Info |
| | Although a facinating part of tcp wrappers, it will not be discussed here. | | | For more information, consult the tcp wrappers README. | | | TCP Wrappers were written by Weitse Venema as a means of tracking various hacker activites. |
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http://www.stanford.edu/group/itss-ccs/security/unix/tcpwrappers.html
(496 words)
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| | draft-jin-wei-low-tcp-fast-00.txt |
| | Motivation This document proposes FAST TCP, a modification to the TCP congestion control algorithm for high-speed long-distance connections. | | | Abstract This document proposes FAST TCP, a modification to the TCP congestion control algorithm for high-speed long-distance networks. | | | By the current TCP, we mean a TCP implementation that is based on TCP Reno and includes RFC 1323 (high-performance extensions), RFC 2018 (SACK), RFC 2582 (New Reno), RFC 2883 (D-SACK), and RFC 2988 (RTO). |
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http://www.math.utah.edu:8080/ftp/pub/mirrors/ftp.ietf.org/internet-drafts/draft-jin-wei-low-tcp-fast-00.txt
(2220 words)
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| | TCP Wrapper - a Whatis.com definition |
| | TCP Wrapper is a public domain computer program that provides firewall services for Unix servers. | | | If an external computer or host attempts to connect, TCP Wrapper checks to see if that external entity is authorized to connect. | | | Wietse Venema has written a paper describing TCP Wrapper. |
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http://whatis.techtarget.com/gDefinition/0,294236,sid44_gci751000,00.html
(225 words)
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