On Saturday 31 May 2003 2:17 pm, Steve Jeppesen wrote: > Right, these ARP requests are being directed to my external interface, > eth0, from the Internet - they are not entering my internal network, but > I believe this is the "excess" traffic I see on the cable modem. I say > "excess", because I was not seeing the data lights (traffic) flash as > they have been with our old IP number. But it seems unusual that my IP > has to tell everybody where to go to find out who or where to be routed > - mind you, the IP's doing the ARP request do seem to be coming from the > same IP range, 24.xxx.xxx.xxx, mainly 24.118.xxx.xxx and 24.245.xxx.xxx
-- Richard Urwin
In all honesty unless you are seriously paranoid, ignore it. Rich is correct: Cable uses broadcast requests that are sent out ever few seconds to all comps on the Node that your neighbourhood is being served by thru the ISP you use. Think of it as party line telephones. You can "tap" into any such request & figure out what everyone on the node is looking at on their comp. Some will be SETI requests, others for porn sites, still others MSN / ICQ chats...etc. Ethereal & proggies like it will just tell you what is being broadcast and unless set correctly, won't give you destination IP's. Or it will give a destination IP and you can figure out which house it is from there. Its one of the downfalls of cable if you're a smart dooby with time on your hands: Its not nearly as difficult to crack as DSL can be with teh correct protocols in place. Not to say DSL is secure but its better in some ways.
Oh & Btw: "the IP's doing the ARP request do seem to be coming from the
> same IP range, 24.xxx.xxx.xxx, mainly 24.118.xxx.xxx and 24.245.xxx.xxx". Thats your NODE for your neighbourhood. the 24.xxx is the actuall ISP's Block Node (given from their Tier 2 or 3 connection, usually AT & T or MetroNet or UUNet). 24.118.xxx is the block node for very likely your geographic regional area. IE: Langley, Virginia. The next octet is your specic Local geo area IN Langley itself. IE: a suburb inside Langley. The last 3 are specific to your neighbourhood, with the last 1-2 numbers being for your house + the next one beside you usually. Sometimes just your own house gets 2 last numbers cause no one beside you has cable.
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