How do you turn on promiscuous mode from the command line for an
ethernet device (if possible).
It's possible (tcpdump does it). AFAIK, there is no command to do
just this (and, if you have multiple interfaces active, and
forwarding enabled [e.g., if you are "sharing" an internet
connection]), then you should be very careful if you do this (you
will place duplicate packets on networks attached to the interface).
If you want to experiment, you can do something like "tcpdump src no-
such-address". Then tcpdump will sit quietly, and the interface will
be in promiscuous mode (you can verify this with ifconfig). The
kernel will do a bit of work verifying that no packet matches the
request, but it's not onerous.
Cf. the code for libpcap, which implements this capability, as used
by tcpdump.
Regards,
Justin
--
Justin C. Walker, Curmudgeon-At-Large
Institute for General Semantics
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It's not whether you win or lose...
It's whether *I* win or lose.
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