How to track your coworkers – Simple passive network surveillance

Re:How to track your coworkers – Simple passive network surv... by pritambaral on Friday October 31, 2014 @06:47PM (#8541475)

Just tried it out on our LAN. Had to modify options to ping to '-bc 4' (I'm on desktop Linux), still didn't work. The only host that responded was the gateway. We have Windows, Debian, Ubuntu and Arch Linux hosts on our network.

EDIT: Linux discards normal broadcast ICMP responses. Must switch off /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts. Even after doing so, no responses. I guess broadcast ping flood is a serious DoS concern that it's almost universally disabled.

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Re:How to track your coworkers – Simple passive network surv... by thyrsus on Saturday November 01, 2014 @02:10PM (#8543980)

Yes: you would need to change /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts on every Linux device on your network. Which has the nice effect that this "tracking" becomes opt-in :-).

Meanwhile, my employer uses a non-Microsoftly-inconvenient authentication to get onto their WiFi, so I've never bothered to attach the smart phone they assigned me to their WiFi, since I've got access to bigger screens for network activities when I'm there.

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