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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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intro(7)						 Miscellaneous Information Manual						  intro(7)

NAME
intro - Introduction to special files DESCRIPTION
Section 7 describes the special files, related driver functions, and networking support available in the system. In this section of the reference pages, the SYNOPSIS heading of each configurable device gives a sample specification for use in constructing a system description for the config program. The DIAGNOSTICS heading lists messages that may appear on the console and in the system error log file /usr/adm/syserr/syserr.hostname due to errors in device operation. Software support for configurable devices comes in two forms. A hardware device may be supported with a character or block device driver or, if used within the networking subsystem, may be supported with a network interface driver. There are some devices that have fixed input/output space CSR addresses and interrupt vector addresses. There are no address switches or jumpers that need to be set up by the customer or Field Service. Some reference pages in this section may contain suffixes to allow their files to exist with those of other reference pages having the same base name and section number. When used, suffixes are made up of one to four letters. See the man(1) reference page for more information on suffixes. FILES
/dev/* RELATED INFORMATION
Commands: MAKEDEV(8) delim off intro(7)
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