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Comcast Lying About Vonage
jehnx writes, "Apparently, Comcast is trying some new tricks to get people to sign up for its version of VoIP, 'Comcast Digital Voice,' according to Wang (of WangScript fame). From the blog post: 'Today my wife received a phone call from a Comcast representative who had called to promote their new "Comcast Digital Voice" service... Ordinarily, we don't mind Comcast calling us from time to time with new offers... [but this time] they proceeded to tell LIE after LIE in an attempt to convince us that Vonage was not as good as Comcast Digital Voice. Imagine how many people would be scared into using Comcast Digital Voice because Comcast makes them believe that Vonage is insecure and only works when your PC is turned on.' Is Comcast going a bit far in their techniques to lure in new customers?"
do you really think this is Comcast, or some jerk rep that's trying to meet his quota or make an extra few $ on commission!
(Why did this posting make it through?)
DSL is no better than Cable. While you are somewhat more electrically isolated from your neighbors, it's still ultimately shared... On cable, yes, my packets and my neighbor's packets are on the same physical wire all the way to the head end (where thousands of other's meet on their way to the ISP.) On DSL, they travel down the same trunk to the DSLAM (where they meet and travel down a T1/T3/OC-3 (depending on how cheap your provider is) to the ISP.) While it looks easy to snoop your neighbor's traffic on cable -- it's right there on the cable just the same as yours, the volume (and number of channels) means you have a lot to hunt through to find one specific modem. And cablemodems support "baseline privacy" that scrambles the data making it harder to decode. (but it's still "simple" crypto, designed to limit cloning.)
DSL is a bit of a challenge, too. However, DSL can be monitored from other pairs in the same trunk just like a cable modem. (listen for weak cross-talk.) The DSL physical layer isn't scrambled at all, so if you can see the signal (no matter how weak), it can be decoded with ease.
The PSTN ceased to be truly circuit switched decades ago. It's been digitized, packet switching for a long time. The only circuit is in the "last mile" from the CO to CPE. And more often than not these days, your copper wires don't even go all the way back to the CO; they go to a multiplexer. (or "remote DSLAM" if we're talking DSL.)
As to which is "secure"... neither. POTS/DSL is easiest to sniff if you're willing to sneak around to plant a physical tap -- on the NID or any of the boxes on down the line, right down to breaking into the DSLAM itself. Cable just requires you be somewhere in the neighborhood (no sneaking required), and willing to sift through a lot of noise to find one specific modem's traffic.
On the issue of power, both DSL and cable are endpoint powered. If your house loses power, your modem will stop working. It doesn't matter if it's a DSL modem or a Cable modem. Telco's may have more experience with keeping their equipment powered, but they aren't going to give a shit if the DSLAM loses power during a storm; they'll only care about keeping "lifeline" services (read: POTS) functional. That DSLAM in the cabinet at the top of the hill doesn't have a generator backing it up.