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Full Discussion: Ethereal
Special Forums IP Networking Ethereal Post 18829 by Neo on Wednesday 3rd of April 2002 01:09:36 PM
Old 04-03-2002
If your network has controlled IP addresses and MAC addresses you can determine if a new device that is not authorized is on the network. This might help if you know that authorized users are not sniffing.... (based on trust and/or policy)... that depends on the size of your network under administration.

As PxT says, there is no way to know if a device is running a sniffer, except by looking at the device and seeing what software is installed and what processes are being executed.

Segmenting your traffic on a switch, as you suggest, helps, but if your device talks to devices outside the segment or across the switch, then the problem still exists... for example, when you talk to 'me' from your place, then people will be able to sniff from many points across the Internet.

If you need confidentiality, then I recommend you look at different cryptographic systems such as SSH, OpenSSH, SSLeay, PHP and a host of other cryptographic systems available to insure your traffic invisible to sniffers.
 

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LEARN ABOUT MOJAVE

systemd-networkd

SYSTEMD-NETWORKD.SERVICE(8)				     systemd-networkd.service				       SYSTEMD-NETWORKD.SERVICE(8)

NAME

       systemd-networkd.service, systemd-networkd - Network manager

SYNOPSIS

       systemd-networkd.service

       /lib/systemd/systemd-networkd

DESCRIPTION

       systemd-networkd is a system service that manages networks. It detects and configures network devices as they appear, as well as creating
       virtual network devices.

       To configure low-level link settings independently of networks, see systemd.link(5).

       systemd-networkd will create network devices based on the configuration in systemd.netdev(5) files, respecting the [Match] sections in
       those files.

       systemd-networkd will manage network addresses and routes for any link for which it finds a .network file with an appropriate [Match]
       section, see systemd.network(5). For those links, it will flush existing network addresses and routes when bringing up the device. Any
       links not matched by one of the .network files will be ignored. It is also possible to explicitly tell systemd-networkd to ignore a link by
       using Unmanaged=yes option, see systemd.network(5).

       When systemd-networkd exits, it generally leaves existing network devices and configuration intact. This makes it possible to transition
       from the initrams and to restart the service without breaking connectivity. This also means that when configuration is updated and
       systemd-networkd is restarted, netdev interfaces for which configuration was removed will not be dropped, and may need to be cleaned up
       manually.

CONFIGURATION FILES

       The configuration files are read from the files located in the system network directory /lib/systemd/network, the volatile runtime network
       directory /run/systemd/network and the local administration network directory /etc/systemd/network.

       Networks are configured in .network files, see systemd.network(5), and virtual network devices are configured in .netdev files, see
       systemd.netdev(5).

SEE ALSO

       systemd(1), systemd.link(5), systemd.network(5), systemd.netdev(5), systemd-networkd-wait-online.service(8)

systemd 237													       SYSTEMD-NETWORKD.SERVICE(8)
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