On Wed, Feb 03, 2010, Vadkan Jozsef wrote: >How can I find out that someone is using it's network card in >promiscuous mode in a subnet? We use the swatch log watcher, to detect lines like this in /var/log/messages (this is from a system running VMware virtual machines in bridging mode so this is normal): Jan 28 17:35:57 pogo kernel: device eth1 entered promiscuous mode Bill -- INTERNET: bill at celestial.com Bill Campbell; Celestial Software LLC URL: http://www.celestial.com/ PO Box 820; 6641 E. Mercer Way Voice: (206) 236-1676 Mercer Island, WA 98040-0820 Fax: (206) 232-9186 Skype: jwccsllc (206) 855-5792 Our Foreign dealings are an Open Book, generally a Check Book. Will Rogers