Packages and Binaries:
ptunnel is an application that allows you to reliably tunnel TCP connections to a remote host using ICMP echo request and reply packets, commonly known as ping requests and replies. It acts as a proxy and can handle sockets and secured identification.
Those features can be very handy when working in a closed networking environment with firewalls and proxies.
How to install:
sudo apt install ptunnel
Tunnel TCP connections over ICMP echo request/reply packets.
[email protected]:~# ptunnel -h ptunnel v 0.72. Usage: ptunnel -p <addr> -lp <port> -da <dest_addr> -dp <dest_port> [-m max_tunnels] [-v verbosity] [-f logfile] ptunnel [-m max_threads] [-v verbosity] [-c <device>] -p: Set address of peer running packet forwarder. This causes ptunnel to operate in forwarding mode - the absence of this option causes ptunnel to operate in proxy mode. -lp: Set TCP listening port (only used when operating in forward mode) -da: Set remote proxy destination address if client Restrict to only this destination address if server -dp: Set remote proxy destionation port if client Restrict to only this destination port if server -m: Set maximum number of concurrent tunnels -v: Verbosity level (-1 to 4, where -1 is no output, and 4 is all output) -c: Enable libpcap on the given device. -f: Specify a file to log to, rather than printing to standard out. -s: Client only. Enables continuous output of statistics (packet loss, etc.) -daemon: Run in background, the PID will be written in the file supplied as argument -syslog: Output debug to syslog instead of standard out. -udp: Toggle use of UDP instead of ICMP. Proxy will listen on port 53 (must be root). Security features: [-x password] [-u] [-setuid user] [-setgid group] [-chroot dir] -x: Set password (must be same on client and proxy) -u: Run proxy in unprivileged mode. This causes the proxy to forward packets using standard echo requests, instead of crafting custom echo replies. Unprivileged mode will only work on some systems, and is in general less reliable than running in privileged mode. Please consider combining the following three options instead: -setuid: When started in privileged mode, drop down to user's rights as soon as possible -setgid: When started in privileged mode, drop down to group's rights as soon as possible -chroot: When started in privileged mode, restrict file access to the specified directory -setcon: Set SELinux context when all there is left to do are network I/O operations To combine with -chroot you will have to `mount --bind /proc /chrootdir/proc` Starting the proxy (needs to run as root): [root #] ptunnel Starting a client (also needs root): [root #] ptunnel -p proxy.pingtunnel.com -lp 8000 -da login.domain.com -dp 22 -c eth0 And then using the tunnel to ssh to login.domain.com: [user $] ssh -p 8000 localhost And that's it. Enjoy your tunnel!
Updated on: 2021-Sep-13