Sam, You can check out the DOCSIS standards here:
http://www.cablemodem.com/ (check out the "specifications" section) You should, at a minimum, see broadcasts from the other devices on your cable network. Mostly you will see arp broadcasts, but some Windows users on "raw" cable may still be out there. Here's a quick snip of what I see if I sniff my connection (this is using snoop on solaris): 10.10.104.1 -> (broadcast) ARP C Who is 10.10.107.250, 10.10.107.250 ? 12.220.96.1 -> (broadcast) ARP C Who is 12.220.97.204, 12.220.97.204 ? 12.220.96.1 -> (broadcast) ARP C Who is 12.220.98.16, 12.220.98.16 ? 10.10.100.1 -> (broadcast) ARP C Who is 10.10.103.128, 10.10.103.128 ? 12.220.100.1 -> (broadcast) ARP C Who is 12.220.100.226, 12.220.100.226 ? (and much more of the same) HTH, Kent -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of sam sneed Sent: Monday, March 18, 2002 11:57 AM To: [EMAIL PROTECTED] Subject: Is cable network really a shared medium? [7:38705] I just changed services from DSL to cable modem. I have heard from people, including verizon, that cable is not as secure as DSL becuase it is over a shared medium. I connected to my cable modem and fired up my packet sniffer. I did not see anyone elses traffic on the line so i am assuming the bandwith is shared( a known fact about cable access) but is somehow filtered at the cable modem(bridge). Does anyone know if this assumption is true and the inside details of the how data is transmitted over the cable network? A link to a whitepaer would be great. thanks Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=38720&t=38705 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
