Jim Nelson wrote:
chuck gelm wrote:
Howdy:
I have cable modem access to the internet now and the download speed is
double my original DSL speed. :-) However, I am concerned about
security.
Can other cable modem subscribers see my packets?
IIRC, most modern cable modems filter anything not addressed to them -
you'd have to hack your modem to get it to go into promiscuous mode.
It's not easy to do, and it relies on brain-dead network admins to leave
some back doors in.
OTOH, you could probably find hardware to do just this - if you were in
law enforcement.
To test this, I am trying to use tcpdump to monitor packets that my
cable modem is sending to my 'router'.
I am using these arguments:
tcpdump -i eth1 -c 9 -nt not arp and not host W.X.Y.Z > \
http://gelm.net/tcpdump.txt
(<W.X.Y.Z> == My assigned IP address)
I am still seeing many 'bootp' packets.
How do filter out 'bootp' packets with tcpdump?
Regards, Chuck
Hi, Jim:
I am filtering 'my ip', port 67, and 'arp' and, for several minutes
now, tcpdump has displayed zero packets. So, I seems that...
It would require special hardware for others to view my packets.
I wanted to be sure that it wouldn't be easy.
Regards, Chuck
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