A BNC (short for Bounced Network Connection) is a piece of software that is used to relay traffic and connections in computer networks, much like a proxy. Using a BNC allows a user to hide the original source of the user's connection, providing privacy as well as the ability to route traffic through a specific location. A BNC can also be used to hide the true target to which a user connects.[1]
Scheme of an IRC network with normal clients (green), bots (blue) and bouncers (orange)
One common usage is over Internet Relay Chat (IRC) via a BNC running on remote servers. In such an environment, where it is very easy to ascertain a user's IP address a BNC may help to hide the original connection source, as well as providing the opportunity for "vhosts" or "virtual hosts". The use of a vhost does not conceal the connection any better but merely adds a statement as the hostname.
Many BNCs remain connected to an IRC server in the event the client should disconnect from the Internet. Often state changes are tracked so that they may be relayed to the client upon reconnection. Some implementations opt to store all messages sent across the network that the client would have normally received and send them upon the client's reconnection; this is often considered to be much too resource dependent for commercial hosting services to provide. Other logging features and bot like functions may be included with various implementations but are not standard.
Exampleedit
User A logs onto IRC directly and appears as USER!user@users.reverse.dns
User A logs onto IRC indirectly through a BNC and appears as USER!user@bnc.net
Softwareedit
A list of bouncer software.
Bip IRC Proxy maintains a persistent connection and shows a backlog on reconnect.[2]
ezbounce's features include password protection, remote administration, logging and listening on multiple ports.[3]
JBouncer for IRC, written in Java. Supports logging.[4]
muh bnc is a smart and versatile irc-bouncing tool that will also go on IRC as soon as it is launched, guarding or attempting to get one's nick.[3]
psyBNC is said to be the oldest and most well-known IRC bouncer.[1] It is easy to use, runs on Linux[5] and became popular on FreeBSD,[6] supports IPv4, IPv6, SSL, logging, multiple users and networks etc. Although psyBNC is like any other IRC proxy, it is often installed on compromised systems by the attacker.[7]
shroudBNC (IRC) supports SSL connections and offers a web interface. [8]
ZNC (IRC) is easy to use,[1] supports SSL connections, IPv6 and logging and offers a web interface. It is extendible by modules and scripts in C++, Python, Perl and Tcl.
Bouncer written in Java is a generic bouncer/proxy. Supports SSL tunneling, Failover and LoadBalancing of destinations.[9]
dircproxy
The Lounge acts like a bouncer and a progressive web app (PWA) client combined. It is open source.
soju is a simple and easy-to-configure IRC bouncer. The project is hosted on SourceHut.
BNCs are also often used for File Transfer Protocol (FTP), again to hide the user and server from each other and to route traffic through a specific location. FTP bouncers can be divided into two different categories, entry and traffic.
An entry bouncer acts as a gateway to the server, but it does not hide the existence of the actual server. Entry bouncers, like cubnc, can be used in a multiserver setup for easy access to each server and load balancing. This removes the need to select which FTP server to log into, when trying to access the server farm.
Traffic bouncers relay traffic through the host they are installed on and present themselves as if they were the FTP server, thus hiding the real location of the server completely. Multiple traffic bouncers can be installed parallel in order to balance traffic load across different links. Most elaborate bouncers can even bounce secure SSL/TLS connections.
^ abcLederer, Christian (phrozen77). (December 22, 2009). "IRC bouncer comparison" February 14, 2015, at the Wayback Machine. IRC-Junkie. December 22, 2009.
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A BNC short for Bounced Network Connection is a piece of software that is used to relay traffic and connections in computer networks much like a proxy Using a BNC allows a user to hide the original source of the user s connection providing privacy as well as the ability to route traffic through a specific location A BNC can also be used to hide the true target to which a user connects 1 Contents 1 IRC 1 1 Example 1 2 Software 2 FTP 3 See also 4 References 5 External linksIRC edit nbsp Scheme of an IRC network with normal clients green bots blue and bouncers orange One common usage is over Internet Relay Chat IRC via a BNC running on remote servers In such an environment where it is very easy to ascertain a user s IP address a BNC may help to hide the original connection source as well as providing the opportunity for vhosts or virtual hosts The use of a vhost does not conceal the connection any better but merely adds a statement as the hostname Many BNCs remain connected to an IRC server in the event the client should disconnect from the Internet Often state changes are tracked so that they may be relayed to the client upon reconnection Some implementations opt to store all messages sent across the network that the client would have normally received and send them upon the client s reconnection this is often considered to be much too resource dependent for commercial hosting services to provide Other logging features and bot like functions may be included with various implementations but are not standard Example edit User A logs onto IRC directly and appears as USER user users reverse dns User A logs onto IRC indirectly through a BNC and appears as USER user bnc net Software edit A list of bouncer software Bip IRC Proxy maintains a persistent connection and shows a backlog on reconnect 2 bnc is the original IRC bouncer 3 ezbounce s features include password protection remote administration logging and listening on multiple ports 3 JBouncer for IRC written in Java Supports logging 4 muh bnc is a smart and versatile irc bouncing tool that will also go on IRC as soon as it is launched guarding or attempting to get one s nick 3 psyBNC is said to be the oldest and most well known IRC bouncer 1 It is easy to use runs on Linux 5 and became popular on FreeBSD 6 supports IPv4 IPv6 SSL logging multiple users and networks etc Although psyBNC is like any other IRC proxy it is often installed on compromised systems by the attacker 7 shroudBNC IRC supports SSL connections and offers a web interface 8 ZNC IRC is easy to use 1 supports SSL connections IPv6 and logging and offers a web interface It is extendible by modules and scripts in C Python Perl and Tcl Bouncer written in Java is a generic bouncer proxy Supports SSL tunneling Failover and LoadBalancing of destinations 9 dircproxy The Lounge acts like a bouncer and a progressive web app PWA client combined It is open source soju is a simple and easy to configure IRC bouncer The project is hosted on SourceHut FTP editThis section does not cite any sources Please help improve this section by adding citations to reliable sources Unsourced material may be challenged and removed July 2011 Learn how and when to remove this message BNCs are also often used for File Transfer Protocol FTP again to hide the user and server from each other and to route traffic through a specific location FTP bouncers can be divided into two different categories entry and traffic An entry bouncer acts as a gateway to the server but it does not hide the existence of the actual server Entry bouncers like cubnc can be used in a multiserver setup for easy access to each server and load balancing This removes the need to select which FTP server to log into when trying to access the server farm Traffic bouncers relay traffic through the host they are installed on and present themselves as if they were the FTP server thus hiding the real location of the server completely Multiple traffic bouncers can be installed parallel in order to balance traffic load across different links Most elaborate bouncers can even bounce secure SSL TLS connections See also editProxy Open proxyReferences edit a b c Lederer Christian phrozen77 December 22 2009 IRC bouncer comparison Archived February 14 2015 at the Wayback Machine IRC Junkie December 22 2009 Friedman Nat June 17 2011 Instant company Archived June 24 2011 at the Library of Congress Web Archives nat org a b c Linux IRC mini HOWTO IRC Bouncers IRC Proxy The Linux Documentation Project TLDP org JBouncer Jibble org Retrieved May 24 2012 psyBNC documentation Ubuntu com Retrieved September 14 2008 irc psyBNC Freshports Retrieved September 14 2008 Mierau Caspar Clemens April 2007 Looking for intruders with lsof PDF Linux Magazine shroudBNC shroudbnc info Bouncer Github Retrieved November 2 2012External links editBNC software at Curlie Retrieved from https en wikipedia org w index php title BNC software amp oldid 1176555148, wikipedia, wiki, book, books, library,
