Free udp bridge software for linux

UDP-Bridge is a transparent proxy for UDP traffic, designed for use with Linux 2.2.x kernels. It provides two-way proxying of UDP packets, to avoid the port number mangling that occurs with Linux IP masquerading. This mangle rule causes problems for some online games.

This program was actually developed to solve a problem with handling Playstation 2 network traffic through a Linux firewall. According to testimonials, most games worked fine with this kind of configuration, but the one that I had tried (ATV Offroad Fury 2) would not work. The problem was apparently the UDP port mangling done by Linux IP masquerading, hence the need for this proxy.

To build the proxy, simply run make from within the source directory:

make

To install the proxy, run the following command as root:

make install

This will install the proxy executable (udpbridge) into /usr/local/sbin, and the man page into /usr/local/man/man8.

The last step is to create and install a configuration file. The included example.conf file is a good template for this. The default location for the configuration file is /etc/udpbridge.conf.

mbridge provides a multicast DNS services bridge.

mbridge provides a bridge between LANs for multicast-announced services. As an example, you can use it to share iTunes libraries outside of your LAN with your peers.

It works by querying for and listening to announcements for instances of the desired service using the multicast DNS (mDNS) service discovery protocol.

Upon discovery of a new instance, it announces itself as the provider for that service on all the other LANs.

It then acts as a proxy between the clients and the real server.

How It Works

mbridge queries for and listens to announcements for instances of the desired service using the multicast DNS (mDNS) service discovery protocol.

Upon discovery of a new instance, mbridge announces itself as the provider for that service on all the other LANs. It then acts as a proxy between the clients and the real server.

bridged is a user-space alternative to the in-kernel bridge code in Linux. It uses AVL trees to speed lookups. Currently it only offers basic functionality, but if theres interest, I plan to add some more advanced features like access-lists (filtering), SNMP management, telnet console etc.
Bridged doesnt use autoconf/automake yet. If you want to change paths it installs itself to you need to edit Makefile directly. To compile bridged you need flex and GNU avl library (you can download it from http://www.msu.edu/user/pfaffben/avl/) Perfom make and then make install.
By default, bridged looks for its configuration in /etc/bridged.conf, but you can override this by -c argument on command-line. Typical configuration file for making a bridge between two interfaces looks like this:
bridge-group 0
interface eth0
interface eth1
Youll need GNU avl library. For compiling from source RPM, you also need the devel RPM.
Enhancements:
- Aging MAC address table entries implemented.
- Purging MAC address table implemented.
- mac-address-table "aging ", "entries " and "purge-batch " recognized in config file, but no functionality implemented yet.

SIB (Simple IPX Bridge) is able to tunnel IPX and IP frames received by your Ethernet device via UDP over the Internet. It is able to put the interface it listens on to promiscous mode, so all frames (not only broadcasts, and frames for the tunneling server) can be received.
Actually every 802.3 frame can be tunneled, but SIB only tunnels IPX frames per default (this can be changed via command line). SIB also filters SMB over IPX, to reduce network traffic (this can be disabled too).
Additionally SIB takes care which frames belong to local MAC addresses and sends only broadcasts and frame to non-local MACs to the remote host.
A non-plus-ultra is, that SIB can compress every frame it tunnels via LZO, but you must have LZO library installed.
You may ask yourself: "Why should I need this?" Well, there are lot of answers, but the main reason is: FOR GAMES. Even with KALI for Windows ($14.99) and KALI cracked 1.2 ($0 - but bugs bugs bugs) there is no real WHOLE NETWORK to WHOLE NETWORK connection program which can tunnel IPX, filter SMB, compress it, and works with 2.4.0. And EVERY new game (for Windows) uses IPX for "network" (or should I say Internet ;-) games. (RA2, Q3, HL...)
Enhancements:
- fix for "divide by zero" bug on alpha
- fixed hostname resolver
- added option to set local UDP port
- added option to bind to an specific local IP
- MAC lists flushed on SIGHUP

Linux Bridge Utilities is a bridge is a way to connect two Ethernet segments together in a protocol independent way. Packets are forwarded based on Ethernet address, rather than IP address (like a router). Since forwarding is done at Layer 2, all protocols can go transparently through a bridge.

The Linux bridge code implements a subset of the ANSI/IEEE 802.1d standard. [1]. The original Linux bridging was first done in Linux 2.2, then rewritten by Lennert Buytenhek. The code for bridging has been integrated into 2.4 and 2.6 kernel series.

Manual Configuration

Network cards

Before you start make sure both network cards are set up and working properly. Dont set the IP address, and dont let the startup scripts run DHCP on the ethernet interfaces either. The IP address needs to be set after the bridge has been configured.

The command ifconfig should show both network cards, and they should have be DOWN.

Module loading

In most cases, the bridge code is built as a module. If the module is configured and installed correctly, it will get automatically loaded on the first brctl command.
If your bridge-utilities have been correctly built and your kernel and bridge-module are OK, then issuing a brctl should show a small command synopsis.

udpShell is a remote shell that uses UDP instead of TCP. It uses a client-server architecture (udpShell as the daemon and udpClient as the client).

Installation:
cd src
make
this sould make the work

if you like edit the Makefile to reflect your system, preferences.

Privbind is a small tool allowing secure running of unprivileged programs, but allowing them to bind to privileged (<<less