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# 2ping - A bi-directional ping utility
https://www.finnie.org/software/2ping/
## About
2ping is a bi-directional ping utility.
It uses 3-way pings (akin to TCP SYN, SYN/ACK, ACK) and after-the-fact state comparison between a 2ping listener and a 2ping client to determine which direction packet loss occurs.
## Installation
2ping requires Python 3 version 3.5 or higher.
To install:
sudo python3 setup.py install
Python 3 stdlib is the only requirement for base functionality, but 2ping can utilize the following modules if available:
* [distro](https://pypi.org/project/distro/) for system distribution detection
* [dnspython](https://pypi.org/project/dnspython/) for --srv
* [netifaces](https://pypi.org/project/netifaces/) for listening on all addresses in --listen mode
* [pycryptodomex](https://pypi.org/project/pycryptodomex/) (recommended) or [pycryptodome](https://pypi.org/project/pycryptodome/) or [pycrypto](https://pypi.org/project/pycrypto/) for --encrypt
* [systemd](https://pypi.org/project/systemd/) for using systemd-supplied sockets
## Usage
Please see the 2ping manpage for invocation options, but in short, start a listener on the far end:
2ping --listen
And run 2ping on the near end, connecting to the far end listener:
2ping $LISTENER
Where "$LISTENER" is the name or IP address of the listener.
## License
2ping - A bi-directional ping utility
Copyright (C) 2010-2020 [Ryan Finnie](https://www.finnie.org/)
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
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