Free ping tunnel software for linux

Port forward is a java application which gives you the ability to open tunnels between your local computer and a remote ssh server. With Port forward, tunnels can be created both local or remote.

Examples:

1. Open a local tunnel to reach a remote mysql database

- Your application needs to connect to a remote database server (mysql for example), but the database server (remote.server.example) is not configured to expose mysql to internet directly.
- Port forward will open a local port (3306) and redirect the connections to remote.server.example ssh server
- The remote.server.example ssh server will connect to its local mysql server

2. Open a local tunnel to use a remove VNC desktop

- You want to connect to your home computer which has a vnc server but from work, the firewall blocks vnc connections (generally on port 5901)
- If you have a ssh server at home, you could use it as bridge to connect to a client in your home:

Your position internet your linux ssh server ->>
-->> you client with vnc (192.168.0.40)

you office
internet >

3. Open a remote tunnel to pilot a remote linux server non reachable through internet
In this example, you will create a remote tunnel, this will give the remote man to connect to and reach you.

I used this example if I have to pilot a remote pc, but this pc has no static IP or is behind a firewall
The good solution is to activate port forward on the pc to be piloted and to connect it to a server we can access.


PC 1 (to be piloted) --||||-- firewall ----- internet ----- accessible-server

Installation:

Be sure java is in you classpath
tar zxvf portforward.tar.gz
cd portForward
sh run_linux.sh

This utility is meant to ease the configuration of yavipin on both clients and servers. It foll.ows the same configuration scheme as vtun, so people migrating from vtun will not find any difficulties writing up yavipin confs.

Yavipind is a secure tunnel aka 2 peers securely forwarding packets toward each other. It forwards any kind of packet (IPv4, IPv6 or other) sent over the virtual point-to-point device (e.g. tun0). It fully runs in linux userspace.

Web Ping is a program for testing your internet connection.

Web Ping is a simple application to test an internet connection to a perticular site. I created this application after my work moved locations and half our network stayed in the old building and the other half moved with us to the new location.

A flaky (significant point) VPN was set up to keep the two connected. Since a couple of the unmoved servers were of interest to me, I keeped checking to see if they were still accessable with the ping command before doing any serious work with them.

A quick and pathetic Google resulted in no other program that meet my needes, so I wrote one.

Insted of doing an actual network ping, Web Ping tests a connection by downloading a web page on a given server. The size of the page and time are stored in memory and the times are graphed. In this way, sites that block network a ping can still be tracked.

Web Ping also keeps track of the largest and smallest download times per session and also tracks the max and min values currently on the graph. Times of interest are graphed in a color which represents if it is a max or a min. (see figure one). The history tab also lists all the max values as they have been recevied.

A running average is also calculated with each download. The files downloaded are not processed or stored in any way. This prevents any security problems that can normaly happen in a web browser enviroment. The only two pecies of information retained about a downloaded file is the size and time.

Usage:

There are two ways to use Web Ping, GUI or CLI mode. The simplest of the two modes is CLI. Web Ping can be started in CLI mode by passing a url to the jar file in a command line interface like this: "java -jar WebPing.jar http://localhost". Web Ping will automaticly start getting statistics on the requested url, printing results to the screnn.

To quite, press q and then then ENTER key. CLI allows the user to Most people will probably want to use the GUI mode which has a history graph and allows the user to start and stop the session.

The best way to run Web Ping is in GUI mode. GUI mode allows the user start and stop the ping process at will and to change the site that is pinged. Users can also see more information about about the history of the pings and view max values and min values easily. There are three tabs on the top of the page, the first is the application, second is the history list, and the last give information about the application.

Port forward is a java application which gives you the ability to open tunnels between your local computer and a remote ssh server.
Tunnels can be created both local or remote
Examples:
1. Open a local tunnel to reach a remote mysql database
Your application needs to connect to a remote database server (mysql for example), but the database server (remote.server.example) is not configured to expose mysql to internet directly.
Port forward will open a local port (3306) and redirect the connections to remote.server.example ssh server
The remote.server.example ssh server will connect to its local mysql server
2. Open a local tunnel to use a remove VNC desktop
You want to connect to your home computer which has a vnc server but from work, the firewall blocks vnc connections (generally on port 5901)
If you have a ssh server at home, you could use it as bridge to connect to a client in your home:
Your position internet your linux ssh server ->>
-->> you client with vnc (192.168.0.40)
you office internet >
You will be now able to connect using a vncclient giving 127.0.0.1:0 as address
3. Open a remote tunnel to pilot a remote linux server non reachable through internet
In this example, you will create a remote tunnel, this will give the remote man to connect to and reach you.
I used this example if I have to pilot a remote pc, but this pc has no static IP or is behind a firewall
The good solution is to activate port forward on the pc to be piloted and to connect it to a server we can access.
PC 1 (to be piloted) --||||-- firewall ----- internet ----- accessible-server
As you can see in this situation, if firewall does not use NAT, you have no way to reah PC 1
Enhancements:
- A button for selecting a command to execute upon connection with the server was added.
- A small problem with removing items was fixed.

THC-RWWWShell is proof-of-concept Perl program for the paper "Placing Backdoors through Firewalls".
It allows communicating with a shell through firewalls and proxy servers by imitating webtraffic. The master/slave relation is reversed, therefore no listening ports are used on the target machine.
THC-RWWWShell was verified to work on Linux, Solaris, AIX and OpenBSD
BUGS: some Solaris machines: select(3) is broken, wont work there on some systems Perls recv is broken (AIX, OpenBSD) ... we cant make proper receive checks here. Workaround implemented.
Enhancements:
- HTTP 1.0 protocol compliance (finally)

prtunnel is a program that can tunnel TCP/IP connections in a variety of ways, including through HTTP and SOCKS5 proxy servers. Some if its possible uses include:
- Tunneling TCP connections from client programs to a remote server through an HTTP or SOCKS5 proxy (useful if youre behind such a proxy and want to use a program that doesnt have native proxy support)
- Tunneling TCP connections from SOCKS-capable client programs through an HTTP or SOCKS5 proxy
- Tunneling TCP connections from an IPv4 client program to an IPv6 server and vice-versa
- Forwarding TCP connections
- Running as a simple SOCKS proxy server
prtunnel project was developed and used under Linux and BSD-based operating systems.
Enhancements:
- A bug that would cause malloc(0) to be called in some situations (which could cause problems on some systems) has been fixed.
- The server timeout, if specified, is now set before the proxy server successfully connects to the remote server, which will prevent the program from hanging if the proxy does not respond to the client.

BSNMP ping is a module for bsnmpd which allows you to measure latency and reachability. It sends out ICMP packets to the configured hosts.

A history of received packets is maintained, and you can query via SNMP how many dropped packets, maximum/minumum latency and other stats for that history period.

As bsnmpd only runs on BSDs (seems that way), this will also be the case for bsnmp-ping.

EXAMPLES

The following example pings two hosts. The first gets pinged once per second, and keeps a history for 300 seconds. The second is pinged 5 times per second, and the history is kept for 30 seconds.

The following would be added to /etc/snmpd.config:

begemotSnmpdModulePath."ping" = "/usr/local/lib/snmp_ping.so"
%ping
pingHost.1 = "10.8.9.2"
pingInterval.1 = 100
pingHistory.1 = 300

pingHost.2 = "2.2.2.2"
pingInterval.1 = 20
pingHistory.1 = 150

Arping is an ARP level ping utility. Its good for finding out if an IP is taken before you have routing to that subnet. You can also ping MAC addresses directly.

Broadcasts a who-has ARP packet on the network and prints answers. VERY useful when you are trying to pick an unused IP for a net that you dont yet have routing to. Then again, if you have no idea what Im talking about then you prolly dont need it.

Arping is util to find out it a specific IP address on the LAN is taken and what MAC address owns it. Sure, you *could* just use ping to find out if its taken and even if the computer blocks ping (and everything else) you still get an entry in your ARP cache. But what if you arent on a routable net? Or the host blocks ping (all ICMP even)? Then youre screwed. Or you use arping.